β-hydroxybutyryl-HIST1H3A (K27) Antibody

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Buffer
Preservative: 0.03% Proclin 300
Constituents: 50% Glycerol, 0.01M PBS, pH 7.4
Form
Liquid
Lead Time
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Synonyms
H3 histone family member E pseudogene antibody; H3 histone family; member A antibody; H3/A antibody; H31_HUMAN antibody; H3F3 antibody; H3FA antibody; Hist1h3a antibody; HIST1H3B antibody; HIST1H3C antibody; HIST1H3D antibody; HIST1H3E antibody; HIST1H3F antibody; HIST1H3G antibody; HIST1H3H antibody; HIST1H3I antibody; HIST1H3J antibody; HIST3H3 antibody; histone 1; H3a antibody; Histone cluster 1; H3a antibody; Histone H3 3 pseudogene antibody; Histone H3.1 antibody; Histone H3/a antibody; Histone H3/b antibody; Histone H3/c antibody; Histone H3/d antibody; Histone H3/f antibody; Histone H3/h antibody; Histone H3/i antibody; Histone H3/j antibody; Histone H3/k antibody; Histone H3/l antibody
Target Names
Uniprot No.

Target Background

Function
Histone H3 is a core component of nucleosomes. Nucleosomes function to package and compact DNA into chromatin, limiting DNA accessibility to cellular machinery that requires DNA as a template. Therefore, histones play a central role in transcription regulation, DNA repair, DNA replication, and chromosomal stability. DNA accessibility is regulated by a complex set of post-translational modifications of histones, also known as the histone code, and nucleosome remodeling.
Gene References Into Functions
  1. Research suggests that epigenetic regulation in cancer may involve inducing E3 ubiquitin ligase NEDD4-dependent histone H3 ubiquitination. PMID: 28300060
  2. The identification of increased expression of H3K27me3 during a patient's clinical course could be helpful in determining if tumors are heterochronous. PMID: 29482987
  3. This research shows that JMJD5, a Jumonji C (JmjC) domain-containing protein, is a Cathepsin L-type protease that mediates histone H3 N-tail proteolytic cleavage under stress conditions that cause a DNA damage response. PMID: 28982940
  4. These findings suggest that the Ki-67 antigen proliferative index has significant limitations and that phosphohistone H3 (PHH3) is an alternative proliferative marker. PMID: 29040195
  5. These results identify cytokine-induced histone 3 lysine 27 trimethylation as a mechanism that stabilizes gene silencing in macrophages. PMID: 27653678
  6. This data indicates that in the early developing human brain, HIST1H3B constitutes the largest proportion of H3.1 transcripts among H3.1 isoforms. PMID: 27251074
  7. This series of 47 diffuse midline gliomas revealed that the histone H3-K27M mutation was mutually exclusive with IDH1-R132H mutation and EGFR amplification, rarely co-occurred with BRAF-V600E mutation, and was commonly associated with p53 overexpression, ATRX loss, and monosomy 10. PMID: 26517431
  8. Data show that histone chaperone HIRA co-localizes with viral genomes, binds to incoming viral, and deposits histone H3.3 onto these. PMID: 28981850
  9. These experiments demonstrated that PHF13 binds specifically to DNA and to two types of histone H3 methyl tags (lysine 4-tri-methyl or lysine 4-di-methyl) where it functions as a transcriptional co-regulator. PMID: 27223324
  10. Hemi-methylated CpGs DNA recognition activates UHRF1 ubiquitylation towards multiple lysines on the H3 tail adjacent to the UHRF1 histone-binding site. PMID: 27595565
  11. This study describes, for the first time, the MR imaging features of pediatric diffuse midline gliomas with histone H3 K27M mutation. PMID: 28183840
  12. Approximately 30% of pediatric high grade gliomas (pedHGG) including GBM and DIPG harbor a lysine 27 mutation (K27M) in histone 3.3 (H3.3) which is correlated with poor outcome and was shown to influence EZH2 function. PMID: 27135271
  13. The H3F3A K27M mutation in adult cerebellar HGG is not uncommon. PMID: 28547652
  14. Data show that lysyl oxidase-like 2 (LOXL2) is a histone modifier enzyme that removes trimethylated lysine 4 (K4) in histone H3 (H3K4me3) through an amino-oxidase reaction. PMID: 27735137
  15. Histone H3 lysine 9 (H3K9) acetylation was most prevalent when the Dbf4 transcription level was highest whereas the H3K9me3 level was greatest during and just after replication. PMID: 27341472
  16. SPOP-containing complex regulates SETD2 stability and H3K36me3-coupled alternative splicing. PMID: 27614073
  17. These findings suggest that binding of the helical tail of histone 3 (H3) with PHD ('plant homeodomain') fingers of BAZ2A or BAZ2B (bromodomain adjacent to zinc finger domain 2A or 2B) requires molecular recognition of secondary structure motifs within the H3 tail and could represent an additional layer of regulation in epigenetic processes. PMID: 28341809
  18. The results demonstrate a novel mechanism by which Kdm4d regulates DNA replication by reducing the H3K9me3 level to facilitate formation of the preinitiation complex. PMID: 27679476
  19. Histone H3 modifications caused by traffic-derived airborne particulate matter exposures in leukocytes. PMID: 27918982
  20. A key role of persistent histone H3 serine 10 or serine 28 phosphorylation in chemical carcinogenesis through regulating gene transcription of DNA damage response genes. PMID: 27996159
  21. hTERT promoter mutations are frequent in medulloblastoma and are associated with older patients, prone to recurrence and located in the right cerebellar hemisphere. On the other hand, histone 3 mutations do not seem to be present in medulloblastoma. PMID: 27694758
  22. AS1eRNA-driven DNA looping and activating histone modifications promote the expression of DHRS4-AS1 to economically control the DHRS4 gene cluster. PMID: 26864944
  23. Data suggest that nuclear antigen Sp100C is a multifaceted histone H3 methylation and phosphorylation sensor. PMID: 27129259
  24. The authors propose that histone H3 threonine 118 phosphorylation via Aurora-A alters the chromatin structure during specific phases of mitosis to promote timely condensin I and cohesin disassociation, which is essential for effective chromosome segregation. PMID: 26878753
  25. Hemi-methylated DNA opens a closed conformation of UHRF1 to facilitate its H3 histone recognition. PMID: 27045799
  26. Functional importance of H3K9me3 in hypoxia, apoptosis, and repression of APAK. PMID: 25961932
  27. Taken together, the authors verified that histone H3 is a real substrate for GzmA in vivo in the Raji cells treated by staurosporin. PMID: 26032366
  28. We conclude that circulating H3 levels correlate with mortality in sepsis patients and inversely correlate with antithrombin levels and platelet counts. PMID: 26232351
  29. Data show that double mutations on the residues in the interface (L325A/D328A) decreases the histone H3 H3K4me2/3 demethylation activity of lysine (K)-specific demethylase 5B (KDM5B). PMID: 24952722
  30. Research indicates that minichromosome maintenance protein 2 (MCM2) binding is not required for incorporation of histone H3.1-H4 into chromatin but is important for the stability of H3.1-H4. PMID: 26167883
  31. Data suggest that histone H3 lysine methylation (H3K4me3) plays a crucial mechanistic role in leukemia stem cell (LSC) maintenance. PMID: 26190263
  32. PIP5K1A modulates ribosomal RNA gene silencing through its interaction with histone H3 lysine 9 trimethylation and heterochromatin protein HP1-alpha. PMID: 26157143
  33. Data indicate that lower-resolution mass spectrometry instruments can be utilized for histone post-translational modifications (PTMs) analysis. PMID: 25325711
  34. Research indicates that inhibition of lysine-specific demethylase 1 activity prevented IL-1beta-induced histone H3 lysine 9 (H3K9) demethylation at microsomal prostaglandin E synthase 1 (mPGES-1) promoter. PMID: 24886859
  35. The authors report that de novo CENP-A assembly and kinetochore formation on human centromeric alphoid DNA arrays is regulated by a histone H3K9 acetyl/methyl balance. PMID: 22473132

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Database Links

HGNC: 4766

OMIM: 137800

KEGG: hsa:8350

STRING: 9606.ENSP00000444823

UniGene: Hs.132854

Involvement In Disease
Glioma (GLM)
Protein Families
Histone H3 family
Subcellular Location
Nucleus. Chromosome.

Q&A

What is β-hydroxybutyryl-HIST1H3A (K27) and why is it significant in epigenetic research?

β-hydroxybutyrylation of lysine 27 on Histone H3.1 (HIST1H3A) represents a post-translational modification that plays a significant role in epigenetic regulation. This modification occurs at a specific lysine residue (K27) on the histone protein HIST1H3A, which is a core component of nucleosomes. Nucleosomes function to wrap and compact DNA into chromatin, thereby limiting DNA accessibility to cellular machinery that requires DNA as a template. Through this mechanism, histones like HIST1H3A play central roles in transcription regulation, DNA repair, DNA replication, and chromosomal stability .

The significance of this modification extends beyond basic chromatin structure, as β-hydroxybutyrylation represents one component of the complex "histone code" that regulates DNA accessibility. Researchers targeting this modification can investigate how metabolic changes affect gene expression patterns, making it a crucial area for studies connecting metabolism to epigenetic regulation .

How does β-hydroxybutyryl-HIST1H3A (K27) antibody differ from antibodies targeting other histone modifications?

The β-hydroxybutyryl-HIST1H3A (K27) antibody is specifically engineered to recognize and bind to histone H3.1 only when it carries a β-hydroxybutyryl group at the lysine 27 position. This high specificity distinguishes it from antibodies targeting other modifications like acetylation, methylation, or phosphorylation at the same or different positions.

Unlike antibodies that recognize multiple modification sites or those with cross-reactivity issues, properly validated β-hydroxybutyryl-HIST1H3A (K27) antibodies are raised against immunogens consisting of peptide sequences specifically surrounding the K27 position with the β-hydroxybutyryl modification present . This design ensures they can discriminate between different histone modifications within the complex chromatin landscape, enabling precise mapping of this specific modification's distribution and dynamics.

What are the validated applications for β-hydroxybutyryl-HIST1H3A (K27) antibody?

The β-hydroxybutyryl-HIST1H3A (K27) polyclonal antibody has been validated for multiple experimental applications essential for epigenetic research:

ApplicationDescriptionRecommended Dilution
ELISADetection of β-hydroxybutyrylated K27 in purified histone preparationsValidated, dilution varies by protocol
Western Blot (WB)Protein-level detection of the modification in cell/tissue lysates1:100-1:1000
Immunocytochemistry (ICC)Cellular localization studies1:20-1:200
Chromatin Immunoprecipitation (ChIP)Genomic localization of the modificationApplication-specific optimization required

These applications enable researchers to investigate this modification at multiple levels, from protein abundance to genomic distribution, facilitating comprehensive characterization of its biological significance .

How should I design a ChIP experiment using β-hydroxybutyryl-HIST1H3A (K27) antibody?

Designing an effective ChIP experiment with β-hydroxybutyryl-HIST1H3A (K27) antibody requires meticulous planning and execution:

Experimental Design Steps:

  • Cell preparation: Culture cells under conditions relevant to your research question. For β-hydroxybutyrylation studies, consider manipulating metabolic states (e.g., starvation, ketogenic conditions) to modulate β-hydroxybutyrate levels.

  • Crosslinking and chromatin preparation: Fix cells with 1% formaldehyde for 10 minutes at room temperature to preserve protein-DNA interactions. Quench with glycine, then lyse cells and sonicate chromatin to fragments of 200-500 bp.

  • Antibody selection and validation: Use the polyclonal β-hydroxybutyryl-HIST1H3A (K27) antibody, ensuring batch consistency. Validate specificity through peptide competition assays before proceeding with full experiments.

  • Immunoprecipitation: Incubate sonicated chromatin with 2-5 μg of β-hydroxybutyryl-HIST1H3A (K27) antibody overnight at 4°C. Include appropriate controls: input chromatin, IgG negative control, and a positive control antibody targeting a known abundant histone mark.

  • Washing and elution: Perform stringent washing to remove non-specific binding, then elute protein-DNA complexes.

  • Reverse crosslinking and DNA purification: Reverse formaldehyde crosslinks and purify DNA for downstream analysis.

  • Analysis method selection: Choose between qPCR for targeted regions, ChIP-seq for genome-wide profiling, or CUT&RUN for higher resolution and lower background.

For β-hydroxybutyrylation studies specifically, including metabolic state controls is crucial as this modification may fluctuate with cellular metabolic conditions .

What controls should I include when performing Western blotting with β-hydroxybutyryl-HIST1H3A (K27) antibody?

Robust Western blotting experiments with β-hydroxybutyryl-HIST1H3A (K27) antibody require comprehensive controls:

Essential Controls:

  • Positive control: Include histone extracts from cells treated with β-hydroxybutyrate or under ketogenic conditions known to increase β-hydroxybutyrylation levels.

  • Negative control: Use histone extracts from cells where β-hydroxybutyrylation is minimized (e.g., through relevant metabolic manipulation).

  • Peptide competition: Pre-incubate antibody with excess β-hydroxybutyrylated K27 peptide before Western blotting to confirm signal specificity. The specific signal should be significantly reduced or eliminated.

  • Loading control: Include an antibody against total histone H3 or another stable housekeeping protein to normalize signal intensity.

  • Modification specificity control: If available, include samples treated with histone deacetylase inhibitors or other epigenetic modulators to distinguish β-hydroxybutyrylation from other lysine modifications.

Recommended protocol modifications for optimal results include using dilutions between 1:100-1:1000 of the antibody, blocking with 5% BSA rather than milk (which contains proteins that may cross-react), and optimizing exposure times to capture the specific signal without saturation .

How can I optimize immunocytochemistry protocols for β-hydroxybutyryl-HIST1H3A (K27) detection?

Optimizing immunocytochemistry (ICC) for β-hydroxybutyryl-HIST1H3A (K27) detection requires attention to several critical factors:

Optimization Protocol:

  • Fixation method: Compare 4% paraformaldehyde (10-15 minutes) with methanol fixation (10 minutes at -20°C) to determine which best preserves the epitope while maintaining cellular architecture.

  • Permeabilization: Use 0.1-0.5% Triton X-100 for 5-10 minutes. The concentration may need adjustment based on cell type.

  • Antigen retrieval: For formalin-fixed samples, perform heat-mediated antigen retrieval using citrate buffer (pH 6.0) or Tris-EDTA buffer (pH 9.0) to expose masked epitopes.

  • Blocking: Block with 1-5% BSA in PBS with 0.1% Tween-20 for 30-60 minutes at room temperature to reduce non-specific binding.

  • Primary antibody incubation: Test a range of dilutions from 1:20 to 1:200 of β-hydroxybutyryl-HIST1H3A (K27) antibody. Incubate overnight at 4°C or for 1-2 hours at room temperature in a humidified chamber.

  • Secondary antibody selection: Choose a secondary antibody with minimal cross-reactivity to human proteins if working with human samples. Fluorophore selection should consider autofluorescence characteristics of your sample.

  • Signal amplification: For low-abundance modifications, consider using tyramide signal amplification or quantum dots for enhanced sensitivity.

  • Counterstaining: Include DAPI nuclear staining to provide context for the nuclear localization expected for histone modifications.

The recommended dilution range of 1:20-1:200 provides a starting point, but optimization for specific cell types and experimental conditions is essential for meaningful results .

How do I quantify and interpret Western blot results for β-hydroxybutyryl-HIST1H3A (K27)?

Accurate quantification and interpretation of Western blot results for β-hydroxybutyryl-HIST1H3A (K27) requires systematic analysis:

Quantification Process:

  • Image acquisition: Capture images using a digital imaging system with a linear dynamic range. Avoid overexposure that would compromise quantification accuracy.

  • Background subtraction: Define and subtract the background signal from each lane uniformly.

  • Normalization strategy: Calculate the ratio of β-hydroxybutyryl-HIST1H3A (K27) signal to total histone H3 signal for each sample to account for loading variations.

  • Statistical analysis: For multiple experiments, perform appropriate statistical tests (e.g., t-test for two conditions, ANOVA for multiple conditions) on normalized values.

Interpretation Guidelines:

This quantitative approach transforms Western blot data from qualitative observations to robust measurements suitable for publication-quality research .

What are the key considerations when analyzing ChIP-seq data for β-hydroxybutyryl-HIST1H3A (K27)?

Analyzing ChIP-seq data for β-hydroxybutyryl-HIST1H3A (K27) requires specialized bioinformatic approaches:

Analytical Framework:

  • Quality control: Assess sequencing quality metrics (base quality scores, GC content, sequence duplication levels) using FastQC. For β-hydroxybutyrylation datasets, ensure sufficient sequencing depth (minimum 20 million uniquely mapped reads).

  • Read alignment: Align reads to the reference genome using bowtie2 or BWA with parameters optimized for histone modification profiles (allowing for 1-2 mismatches).

  • Peak calling: Use MACS2 with parameters adjusted for histone modifications (--broad flag, adjusted p-value threshold of 0.01). Compare with other algorithms like SICER that are designed for broad histone mark distributions.

  • Differential binding analysis: Apply DiffBind or DESeq2 to identify regions with statistically significant changes in β-hydroxybutyrylation between conditions.

  • Genomic feature association: Analyze the distribution of β-hydroxybutyryl-HIST1H3A (K27) peaks relative to genomic features (promoters, enhancers, gene bodies) using tools like ChIPseeker or HOMER.

  • Motif enrichment: Identify DNA sequence motifs enriched in β-hydroxybutyrylated regions using MEME or HOMER to infer potential transcription factor associations.

  • Integration with other data types: Correlate β-hydroxybutyrylation patterns with RNA-seq data, other histone modifications, or metabolomic data to establish functional relationships.

  • Visualization: Generate browser tracks, heatmaps, and metagene plots using tools like deepTools or EaSeq to effectively communicate patterns.

This analytical pipeline allows researchers to move beyond mapping β-hydroxybutyrylation locations to understanding their functional significance in gene regulation .

How do different metabolic states affect β-hydroxybutyryl-HIST1H3A (K27) patterns?

Metabolic states significantly influence β-hydroxybutyryl-HIST1H3A (K27) patterns through availability of the β-hydroxybutyryl substrate:

Metabolic Influence Table:

Metabolic StateEffect on β-hydroxybutyryl-HIST1H3A (K27)Biological Significance
Fasting/StarvationIncreased modification due to elevated ketone body productionMay mediate transcriptional responses to nutrient deprivation
Ketogenic DietElevated modification patterns, particularly in liver and brainPotential mechanism for keto-adaptation at transcriptional level
Diabetic KetoacidosisAbnormally high levels of modificationMay contribute to transcriptional dysregulation in pathological states
Fed State (high carbohydrate)Reduced modification due to lower ketone body productionBaseline state with minimal β-hydroxybutyrylation
ExerciseTransiently increased modification, tissue-dependentMay link physical activity to adaptive gene expression changes

When analyzing β-hydroxybutyryl-HIST1H3A (K27) data, researchers should:

  • Document the precise metabolic state of experimental models

  • Consider the timing of sample collection relative to metabolic interventions

  • Measure circulating β-hydroxybutyrate levels when possible to correlate with histone modification patterns

  • Examine tissue-specific differences in modification patterns, as ketone metabolism varies between tissues

  • Compare β-hydroxybutyrylation patterns with other metabolically-responsive histone modifications

Understanding these metabolic relationships is crucial for accurate interpretation of experimental results and may provide insights into how metabolic signals are translated into epigenetic changes .

How can I use β-hydroxybutyryl-HIST1H3A (K27) antibody in multi-omics experimental designs?

Integrating β-hydroxybutyryl-HIST1H3A (K27) antibody-based experiments into multi-omics research requires strategic experimental design:

Multi-omics Integration Strategy:

  • ChIP-seq + RNA-seq: Correlate β-hydroxybutyrylation patterns with transcriptional outputs to identify genes directly regulated by this modification.

    • Experimental approach: Perform ChIP-seq with β-hydroxybutyryl-HIST1H3A (K27) antibody and parallel RNA-seq on the same biological samples

    • Analysis method: Correlate peaks near transcription start sites with expression levels of associated genes

    • Expected outcome: Identification of genes where β-hydroxybutyrylation at K27 correlates with expression changes

  • ChIP-seq + Metabolomics: Connect cellular metabolic state with epigenetic modifications.

    • Experimental approach: Measure cellular/tissue β-hydroxybutyrate levels using mass spectrometry while performing ChIP-seq

    • Analysis method: Correlate metabolite levels with global or locus-specific β-hydroxybutyrylation patterns

    • Expected outcome: Establish quantitative relationships between metabolite availability and histone modification

  • Sequential ChIP (ReChIP): Determine co-occurrence with other histone modifications.

    • Experimental approach: Perform ChIP with β-hydroxybutyryl-HIST1H3A (K27) antibody, then re-ChIP the immunoprecipitated chromatin with antibodies against other modifications

    • Analysis method: Compare single ChIP profiles with sequential ChIP to identify regions with combinatorial modifications

    • Expected outcome: Map the histone modification co-occurrence patterns to understand the combinatorial epigenetic code

  • Proteomics + ChIP-seq: Identify proteins that recognize or regulate β-hydroxybutyrylation.

    • Experimental approach: Use modified peptide pull-downs with β-hydroxybutyrylated and control peptides, followed by mass spectrometry

    • Analysis method: Compare proteins enriched in β-hydroxybutyrylated sample versus control

    • Expected outcome: Discovery of "reader" proteins that specifically recognize this modification

  • Single-cell approaches: Map cellular heterogeneity in β-hydroxybutyrylation.

    • Experimental approach: Combine β-hydroxybutyryl-HIST1H3A (K27) antibody with single-cell technologies like CUT&Tag

    • Analysis method: Cluster cells based on modification patterns and integrate with single-cell RNA-seq

    • Expected outcome: Insight into cell-to-cell variation in β-hydroxybutyrylation and its relationship to transcriptional heterogeneity

These integrative approaches transform single-antibody studies into comprehensive investigations of how β-hydroxybutyrylation connects metabolism to gene regulation .

What are the differences between top-down and bottom-up proteomics approaches for studying β-hydroxybutyrylation?

Top-down and bottom-up proteomics offer complementary insights into β-hydroxybutyrylation dynamics:

Comparative Analysis:

AspectBottom-Up ProteomicsTop-Down ProteomicsRelevance to β-hydroxybutyrylation
Sample PreparationProtein digestion into peptidesAnalysis of intact proteinsBottom-up may lose combinatorial information; top-down preserves it
SensitivityHigher sensitivity for detecting modified peptidesLower sensitivity but better for combinatorial modificationsBottom-up better for low-abundance β-hydroxybutyrylation sites
Modification MappingPrecise localization of individual modificationsComplete modification profile of intact proteinsBottom-up pinpoints exact β-hydroxybutyrylation sites; top-down shows co-occurrence with other modifications
QuantificationRelative quantification through peptide intensityQuantification of proteoforms with distinct modification patternsBottom-up better for site-specific quantification; top-down better for combinatorial state quantification
Technical ChallengesPotential loss of labile modifications during digestionChallenges with large protein analysis and throughputBoth approaches complementary for comprehensive β-hydroxybutyrylation analysis
Informatics RequirementsEstablished workflows for modified peptide identificationComplex algorithms for proteoform characterizationDifferent computational approaches needed for each method

When studying β-hydroxybutyrylation:

  • Bottom-up approaches excel at identifying which specific lysine residues carry the modification across many proteins, providing a broad β-hydroxybutyrylation landscape.

  • Top-down proteomics reveals how multiple modifications co-exist on individual histone molecules, allowing researchers to determine if β-hydroxybutyrylation at K27 occurs simultaneously with other modifications on the same histone tail.

  • A combined approach is often optimal: use bottom-up to map the β-hydroxybutyrylome, then apply top-down to examine combinatorial patterns on histones of particular interest.

  • For β-hydroxybutyryl-HIST1H3A (K27) specifically, top-down approaches can reveal whether this modification exists in isolation or as part of broader modification patterns that collectively regulate chromatin structure and function .

How can I investigate the enzyme systems responsible for adding and removing β-hydroxybutyryl marks at HIST1H3A (K27)?

Investigating the enzymatic regulation of β-hydroxybutyrylation requires systematic approaches:

Methodological Framework:

  • Candidate enzyme screening:

    • Overexpress or knock down known histone acyltransferases (such as p300/CBP, which handles multiple acylation types)

    • Measure changes in global β-hydroxybutyrylation using the β-hydroxybutyryl-HIST1H3A (K27) antibody in Western blots

    • Perform ChIP-seq before and after manipulation to identify genomic regions sensitive to enzyme activity

  • In vitro enzymatic assays:

    • Express and purify candidate writer enzymes

    • Incubate with recombinant histone H3 and β-hydroxybutyryl-CoA substrate

    • Detect modification using β-hydroxybutyryl-HIST1H3A (K27) antibody

    • Quantify reaction kinetics with varying enzyme/substrate concentrations

  • Deacylase identification:

    • Screen sirtuin family proteins (particularly SIRT1-3) and histone deacetylases for β-hydroxybutyryl-removing activity

    • Treat cells with specific inhibitors (e.g., nicotinamide for sirtuins, TSA for HDACs)

    • Measure β-hydroxybutyrylation changes by Western blot and ChIP

    • Perform in vitro deacylation assays with purified enzymes and β-hydroxybutyrylated histones

  • Mass spectrometry confirmation:

    • Following enzyme manipulations, perform quantitative MS to measure β-hydroxybutyrylation changes

    • Use SILAC or TMT labeling for precise quantification

    • Compare results with antibody-based assays for validation

  • Metabolic enzyme relationship:

    • Investigate enzymes involved in β-hydroxybutyrate metabolism (e.g., BDH1, OXCT1)

    • Determine if altering these enzymes affects nuclear β-hydroxybutyryl-CoA availability and subsequent histone modification

  • Enzyme recruitment studies:

    • Perform ChIP-seq for candidate writer/eraser enzymes

    • Compare their genomic localization with β-hydroxybutyryl-HIST1H3A (K27) patterns

    • Use sequential ChIP to determine co-occupancy

This systematic approach can identify the enzymatic machinery responsible for regulating this emerging epigenetic modification, providing targets for experimental manipulation and potential therapeutic intervention .

How can I verify the specificity of my β-hydroxybutyryl-HIST1H3A (K27) antibody?

Verifying antibody specificity is critical for reliable research results:

Comprehensive Validation Protocol:

  • Peptide competition assay:

    • Pre-incubate antibody with excess β-hydroxybutyrylated K27 peptide

    • Run parallel Western blots or immunostaining with competed and non-competed antibody

    • The specific signal should be eliminated in the competed sample

    • Also test competition with unmodified peptide and peptides with other modifications at K27 (acetylation, methylation) to confirm specificity

  • Modified peptide array:

    • Test antibody against a spotted array containing:

      • β-hydroxybutyrylated K27 peptide

      • Unmodified K27 peptide

      • Peptides with other modifications at K27

      • Peptides with β-hydroxybutyrylation at other lysine residues

    • Quantify binding specificity and cross-reactivity

  • Knockout/knockdown validation:

    • Use genetic models where histone H3.1 is mutated at K27 (K27R)

    • Alternatively, manipulate metabolic pathways to reduce β-hydroxybutyrate production

    • Confirm signal reduction in Western blot and immunostaining

  • Mass spectrometry correlation:

    • Perform parallel analysis of histone modifications using mass spectrometry

    • Correlate antibody-based detection with MS-quantified β-hydroxybutyrylation at K27

    • Plot correlation to demonstrate antibody accuracy

  • Lot-to-lot consistency testing:

    • When receiving new antibody lots, perform side-by-side comparison with previous lots

    • Compare Western blot signal intensity, pattern, and background

    • Document lot-specific optimization if necessary

This multi-faceted validation strategy ensures that experimental results genuinely reflect β-hydroxybutyryl-HIST1H3A (K27) patterns rather than antibody artifacts .

What are the common pitfalls in ChIP experiments with β-hydroxybutyryl-HIST1H3A (K27) antibody and how can I avoid them?

ChIP experiments with β-hydroxybutyryl-HIST1H3A (K27) antibody face several challenges:

Pitfalls and Solutions:

PitfallCauseSolution
Low signal-to-noise ratioInsufficient crosslinking or non-specific antibody bindingOptimize formaldehyde crosslinking time (8-12 minutes); increase washing stringency; pre-clear chromatin with protein A/G beads
Inconsistent results between replicatesVariability in metabolic state affecting β-hydroxybutyrylation levelsStrictly control cell culture conditions; synchronize cells; document and normalize to β-hydroxybutyrate levels
False negativesEpitope masking due to formaldehyde-induced crosslinksOptimize sonication conditions; consider alternative crosslinkers; try different antigen retrieval methods
Contaminating DNAIncomplete washing or non-specific bindingIncrease wash stringency progressively; use salmon sperm DNA in blocking buffer; optimize antibody concentration
PCR bias in library preparationGC-content differences in β-hydroxybutyrylated regionsUse polymerases optimized for GC-balanced amplification; minimize PCR cycles; include spike-in controls
Batch effects between experimentsAntibody lot variation or technical differencesInclude common reference samples across batches; normalize to spike-in controls; process all experimental conditions simultaneously

Special Considerations for β-hydroxybutyrylation:

  • Metabolic stability: Minimize fasting/feeding variations before sample collection to maintain consistent β-hydroxybutyrate levels.

  • Crosslinking optimization: Test multiple crosslinking times as excessive crosslinking may mask the β-hydroxybutyryl epitope.

  • Buffer composition: Avoid buffers containing β-hydroxybutyrate or related compounds that might interfere with antibody binding.

  • Control selection: Include regions known to be enriched for β-hydroxybutyrylation as positive controls and regions without histone H3 as negative controls.

  • Antibody storage: Aliquot antibodies to avoid freeze-thaw cycles that might affect specificity for the β-hydroxybutyryl modification.

Implementing these strategies significantly improves ChIP reliability when studying this metabolically sensitive histone modification .

How should I interpret conflicting results between antibody-based detection and mass spectrometry analysis of β-hydroxybutyrylation?

Resolving conflicts between antibody and mass spectrometry data requires systematic investigation:

Analytical Resolution Framework:

  • Understand inherent method differences:

    • Antibody detection is amplitude-based (signal intensity) while MS is count-based (ion detection)

    • Antibodies may have non-linear response curves at high modification densities

    • MS may suffer from ion suppression effects for certain modified peptides

    • Each method samples a different population (antibody: accessible epitopes; MS: efficiently ionized peptides)

  • Experimental validation approaches:

    • Spike-in controls: Add synthetic β-hydroxybutyrylated peptides at known concentrations to samples for both techniques

    • Serial dilution tests: Perform dilution series to identify linearity ranges for both methods

    • Orthogonal technique confirmation: Use a third method (e.g., top-down proteomics or CUT&RUN) for triangulation

    • Biological manipulation: Create conditions where β-hydroxybutyrylation should change predictably and test both methods

  • Technical troubleshooting:

    • Antibody issues: Test for epitope occlusion, cross-reactivity, or batch variation

    • MS challenges: Check for incomplete digestion, modification loss during sample processing, or ion suppression

    • Sample preparation differences: Standardize extraction methods between techniques

  • Data integration strategies:

    • Apply normalization algorithms to make data comparable

    • Focus on relative changes rather than absolute values

    • Use rank-order correlation rather than linear correlation

    • Consider each method's strengths for specific aspects of the analysis

  • Biological context consideration:

    • Evaluate results in light of known biology (e.g., expected changes with metabolic shifts)

    • Consider tissue/cell type-specific factors that might affect detection

    • Examine technical replicates for consistency within each method

When properly analyzed, discrepancies often reveal complementary rather than contradictory information about β-hydroxybutyrylation dynamics, providing deeper insight than either method alone .

How might single-cell approaches advance our understanding of β-hydroxybutyryl-HIST1H3A (K27) dynamics?

Single-cell technologies offer transformative potential for β-hydroxybutyrylation research:

Innovative Applications:

  • Single-cell epigenomic profiling:

    • Adapting CUT&Tag or CUT&RUN with β-hydroxybutyryl-HIST1H3A (K27) antibody for single-cell resolution

    • Revealing cell-to-cell heterogeneity in β-hydroxybutyrylation patterns within tissues

    • Identifying rare cell populations with distinct β-hydroxybutyrylation signatures

  • Integrated single-cell multi-omics:

    • Combining scCUT&Tag for β-hydroxybutyrylation with scRNA-seq (e.g., using SHARE-seq or similar approaches)

    • Correlating β-hydroxybutyrylation patterns with transcriptional outputs at single-cell resolution

    • Identifying direct gene regulatory effects of the modification

  • Spatial epigenomics:

    • Applying β-hydroxybutyryl-HIST1H3A (K27) antibody in spatial technologies like Slide-seq or Visium

    • Mapping β-hydroxybutyrylation gradients across tissue microenvironments

    • Correlating modification patterns with metabolite availability in tissue contexts

  • Temporal dynamics:

    • Using single-cell time-course experiments to track β-hydroxybutyrylation changes during metabolic shifts

    • Determining the kinetics of modification in response to altered β-hydroxybutyrate levels

    • Identifying leader and follower cells in modification responses

  • Computational challenges and solutions:

    • Developing algorithms to integrate sparse single-cell β-hydroxybutyrylation data

    • Creating predictive models for modification dynamics based on metabolic parameters

    • Implementing machine learning approaches to identify determinants of cell-specific β-hydroxybutyrylation patterns

These single-cell approaches will transform our understanding from population averages to precision maps of how metabolic states drive epigenetic modifications at the individual cell level, potentially revealing previously hidden regulatory mechanisms .

What are the emerging therapeutic implications of targeting enzymes regulating β-hydroxybutyrylation?

The therapeutic landscape surrounding β-hydroxybutyrylation regulation offers promising avenues for research:

Therapeutic Research Directions:

  • Metabolic disease interventions:

    • Investigating how modulating β-hydroxybutyrylation affects gene expression in metabolic disorders

    • Developing small molecules that mimic or enhance β-hydroxybutyrate's epigenetic effects

    • Exploring dietary interventions that optimize beneficial β-hydroxybutyrylation patterns

  • Neurological applications:

    • Examining β-hydroxybutyrylation's role in neuroprotection and cognitive function

    • Developing β-hydroxybutyrylation modulators that cross the blood-brain barrier

    • Targeting specific writer/eraser enzymes to enhance neuroprotective gene expression

  • Cancer therapeutics:

    • Investigating cancer-specific alterations in β-hydroxybutyrylation patterns

    • Developing combination therapies targeting both β-hydroxybutyrylation enzymes and other epigenetic mechanisms

    • Exploring synthetic lethality approaches based on cancer-specific β-hydroxybutyrylation dependencies

  • Aging and longevity:

    • Mapping changes in β-hydroxybutyrylation during aging processes

    • Developing interventions that maintain youthful β-hydroxybutyrylation patterns

    • Connecting β-hydroxybutyrylation to other longevity-associated epigenetic marks

  • Immune modulation:

    • Exploring β-hydroxybutyrylation's role in immune cell function and inflammatory responses

    • Developing immunomodulatory approaches targeting specific β-hydroxybutyrylation patterns

    • Investigating connections between diet, β-hydroxybutyrylation, and autoimmune conditions

These therapeutic directions remain in early research stages, requiring extensive validation before clinical translation. Researchers should focus on establishing causal relationships between β-hydroxybutyrylation patterns and disease phenotypes, identifying specific enzymatic targets, and developing highly selective modulators of this modification .

How can computational approaches advance β-hydroxybutyrylation research beyond current limitations?

Computational methods are expanding the frontiers of β-hydroxybutyrylation research:

Advanced Computational Strategies:

  • Predictive modeling of β-hydroxybutyrylation sites:

    • Developing machine learning algorithms to predict likely β-hydroxybutyrylation sites based on sequence context

    • Creating tools that integrate metabolic data to forecast dynamic changes in modification patterns

    • Implementing deep learning approaches that recognize complex patterns from ChIP-seq and proteomics data

  • Integrative multi-omics analysis frameworks:

    • Building computational pipelines that harmonize β-hydroxybutyrylation data with transcriptomics, metabolomics, and other epigenomic features

    • Implementing Bayesian networks to infer causal relationships between metabolic states and epigenetic outcomes

    • Developing factor analysis methods to identify coordinated β-hydroxybutyrylation programs

  • Structural biology applications:

    • Molecular dynamics simulations to understand how β-hydroxybutyrylation affects histone tail conformations

    • Modeling reader protein interactions with modified histones to predict functional outcomes

    • Virtual screening for compounds that might modulate specific β-hydroxybutyrylation-related interactions

  • Network biology approaches:

    • Constructing gene regulatory networks controlled by β-hydroxybutyrylation

    • Identifying metabolic-epigenetic feedback loops involving the modification

    • Mapping the β-hydroxybutyrylation interactome through computational integration of proteomics data

  • Evolutionary bioinformatics:

    • Comparative genomics of β-hydroxybutyrylation machinery across species

    • Identifying conserved regulatory elements associated with β-hydroxybutyrylation sites

    • Reconstructing the evolutionary history of this modification system

These computational approaches extend beyond descriptive analyses to generate testable hypotheses about β-hydroxybutyrylation biology, facilitate experimental design, and extract deeper insights from complex multi-dimensional datasets .

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