PURA Antibody, HRP conjugated

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Description

Introduction to PURA Antibody, HRP Conjugated

The PURA Antibody, HRP conjugated is a bioconjugate designed for enzymatic detection in immunoassays. It combines a rabbit polyclonal antibody targeting purine-rich element binding protein A (PURA) with horseradish peroxidase (HRP), enabling colorimetric or chemiluminescent signal amplification. PURA is a 35–40 kDa protein involved in RNA metabolism and chromatin remodeling, making it a critical target in studies of neurodevelopment, cancer, and RNA-binding processes .

Key Approaches

HRP conjugation to antibodies typically employs heterobifunctional crosslinkers to form stable bonds. Below are methodologies relevant to PURA-antibody conjugation:

MethodChemistryAdvantagesSource
HydraLink™Hydrazine-aldehyde hydrazone bondQuantitative conversion, high purity (>95%), 5-hour workflow
Sulfo-SMCC/SATAMaleimide-thiol linkageDirectional conjugation, minimal antibody loss
LyophilizationPeriodate oxidation + freeze-dryingEnhanced HRP loading, stable storage, improved ELISA sensitivity
Lightning-Link®Proprietary chemistryRapid labeling, neutral pH, no antibody loss

Critical Parameters:

  • Antibody Purity: >90% (SEC HPLC or SDS-PAGE) .

  • HRP Activity: >200 U/mg, high-quality maleimide-activated HRP .

  • Conjugation Efficiency: Target 2–4 HRP molecules per antibody .

Enhanced Sensitivity in ELISA

A modified protocol involving lyophilized activated HRP demonstrated superior performance:

  • Antibody Titer: 1:5000 (vs. 1:25 for classical methods), with p < 0.001 .

  • Mechanism: Lyophilization reduces reaction volume, increasing collision frequency between HRP and antibody molecules, per collision theory .

Validation Methods

AssayPurposeObservationsSource
UV-Vis SpectroscopyConfirm conjugationShift in absorption at 430 nm (HRP peak)
SDS-PAGEAssess conjugate integrityNo migration of conjugate (high MW complex)
Direct ELISAFunctional validationRobust signal at high dilutions

Applications

The PURA Antibody, HRP conjugated is optimized for:

ApplicationSubstrateDetectionSource
Western BlotDAB, ECLChemiluminescent or colorimetric signal
ImmunohistochemistryChromogenic substrates (e.g., TMB)Permanent staining in tissue sections
ELISATMB, ABTSQuantitative antigen detection

Reactivity: Human, mouse, rat samples .

PURA Antibody Characteristics

ParameterValueSource
Host/IsotypeRabbit polyclonal IgG
ImmunogenPURA fusion protein (Ag12173)
MW35–40 kDa (observed)
Storage-20°C (PBS, 50% glycerol, 0.02% sodium azide)

Conjugation Kit Requirements

ComponentSpecificationSource
Antibody Input1 mg per reaction (IgG)
HRP Activity>200 U/mg (maleimide-activated)
Purity Post-Purification>95% (Q spin filter)

Product Specs

Buffer
Preservative: 0.03% Proclin 300
Constituents: 50% Glycerol, 0.01M PBS, pH 7.4
Form
Liquid
Lead Time
Typically, we can ship your order within 1-3 business days after receiving it. Delivery times may vary depending on your location and the method of purchase. Please consult your local distributor for specific delivery details.
Synonyms
PUR ALPHA antibody; PUR1 antibody; purA antibody; PURA_HUMAN antibody; PURALPHA antibody; Purine rich element binding protein A antibody; Purine rich single stranded DNA binding protein alpha antibody; Purine-rich single-stranded DNA-binding protein alpha antibody; Transcriptional activator protein PUR alpha antibody; Transcriptional activator protein Pur-alpha antibody
Target Names
PURA
Uniprot No.

Target Background

Function
PURA is a transcription activator that exhibits specific binding affinity to the purine-rich single strand of the PUR element, located upstream of the MYC gene. This protein is believed to play a role in the initiation of DNA replication and in recombination processes.
Gene References Into Functions
  1. Three genes in our epilepsy cohort (COQ4, DNM1, and PURA), accounting for 14% (3/21) of all novel genetic etiologies identified in patients with epilepsy, were subsequently confirmed in independent publications. PMID: 26795593
  2. PURA may be a potential target of miR-144. The observed downregulation of PURA might be attributed to the increased expression of miR-144. Another predicted target of miR-144, SPRED1, was found to be downregulated in 69% of EC tissues compared to matched distant non-malignant tissues. PMID: 27748283
  3. The results of this study underscore the importance of stress granules in ALS pathogenesis and identify Pur-alpha as a novel regulator of cytoplasmic stress granules dynamics. PMID: 26728149
  4. These findings provide conclusive evidence for the role of PURA in causing a variable syndrome of neurodevelopmental delay, learning disability, neonatal hypotonia, feeding difficulties, abnormal movements, and epilepsy in humans. PMID: 25342064
  5. Mutations in PURA are responsible for profound neonatal hypotonia, seizures, and encephalopathy in 5q31.3 microdeletion syndrome. PMID: 25439098
  6. Data suggest that protein PURalpha is specifically involved in the transcriptional activation of the secondary promoter and may exert its function by forming a complex with E2F-1 and RNA polymerase II. PMID: 24819879
  7. This research suggests a dynamic interplay between transcriptional activators Pur-alpha/Pur-beta and repressors in regulating SMalphaA gene output during myofibroblast differentiation. PMID: 24446247
  8. This study revealed that Pur-alpha exhibits inadequate expression in monocytes, and the translation of Pur-alpha mRNA is repressed by cell-expressed microRNA. PMID: 22835829
  9. The study identifies three functionally distinct PURA promoters and demonstrates that these are utilized differentially in human cell types and that they respond differently to cytomegalovirus infection. PMID: 21062477
  10. The ability of Puralpha to activate the CD11c gene promoter increases in differentiating U937 monocytic cells. PMID: 11937543
  11. PURA acts in conjunction with hnRNP-K to repress the transcriptional activity of the CD43 gene promoter during lymphocyte activation. PMID: 12411317
  12. Results show that PUR proteins are capable of binding to alpha-MHC mRNA and attenuate its translational efficiency; also show robust expression of PUR proteins in failing hearts where alpha-MHC mRNA levels are suppressed. PMID: 12933792
  13. The N-terminal 72 amino acids of Pura were involved in E2F-1 binding, inhibition of promoter activation by E2F-1, and reversal of E2F-mediated growth inhibition. PMID: 15517862
  14. Puralpha has been shown to colocalize with cyclin A/Cdk2 and to coimmunoprecipitate with cyclin A during S-phase. We demonstrate that this interaction is mediated by a specific affinity of Puralpha for Cdk2. PMID: 15707957
  15. Hypoxia induces a coordinated up-regulation in beta2 integrin expression that is dependent upon transcriptional mechanisms mediated by HIF-1 and Pur alpha. PMID: 17641060
  16. The partnership of Puralpha with Rev is beneficial for Rev-mediated expression of the HIV-1 genome. PMID: 17722108
  17. The recruitment of YB1, PURalpha, and H1.2 to the p53 target gene Bax is required for repression of p53-induced transcription. PMID: 18258596
  18. Stable overexpression of PURalpha in PC3 and DU145 cells negatively regulates cell proliferation, resulting in decreases in PCNA expression. PMID: 18386260
  19. A transcriptional repressor complex that binds a specific sequence (repressor element) in the androgen receptor gene 5'-untranslated region in prostate cancer contains Pur alpha. PMID: 18413735
  20. Pur-alpha protein is associated with Alzheimer's disease. PMID: 18780968
  21. Effects of the DNA damage-inducing cancer chemotherapeutic agent cisplatin on mouse embryo fibroblasts (MEFs) from PURA negative knockout mice. PMID: 18927497
  22. Regulation of PURalpha expression in prostate cancer cells may serve as a therapeutic target for hormone-refractory prostate cancer. PMID: 19267365

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Database Links

HGNC: 9701

OMIM: 600473

KEGG: hsa:5813

STRING: 9606.ENSP00000332706

UniGene: Hs.443121

Involvement In Disease
Mental retardation, autosomal dominant 31 (MRD31)
Protein Families
PUR DNA-binding protein family
Subcellular Location
Nucleus.

Q&A

What is PURA and why is it significant in research?

PURA (Purine-rich single-stranded DNA-binding protein alpha, also known as PUR1) functions as a transcription activator that specifically binds to the purine-rich single strand of the PUR element located upstream of the MYC gene. This protein plays essential roles in DNA replication initiation and recombination processes, making it an important target for various molecular biology studies . PURA interacts with critical cellular components including retinoblastoma protein and RNA polymerase II, which contributes to its pivotal role in regulating cell division and DNA transcription . The protein's involvement in these fundamental cellular processes makes PURA antibodies valuable tools for investigating transcriptional regulation, cell cycle control, and related pathways.

What is the principle behind HRP conjugation to antibodies?

HRP (horseradish peroxidase) conjugation to antibodies involves the chemical linking of HRP enzyme molecules to antibody proteins to create detection reagents for immunoassays. The conjugation process typically utilizes heterobifunctional cross-linkers to covalently link antibodies to HRP while maintaining antibody affinity and providing a functional reporter for antigen detection . One common approach employs Sulfo-SMCC to generate maleimide-activated HRP that reacts with sulfhydryl groups created in antibodies through SATA-mediated thiolation . This creates a stable thioether linkage between the antibody and HRP, resulting in a conjugate that can catalyze chromogenic or chemiluminescent reactions when exposed to appropriate substrates, enabling visual or quantitative detection of target antigens in various immunoassay formats.

What are the main applications for PURA Antibody, HRP conjugated?

PURA Antibody with HRP conjugation is primarily utilized in ELISA (Enzyme-Linked Immunosorbent Assay) applications as indicated by product specifications . Additionally, while not explicitly stated for the PURA Antibody specifically, HRP-conjugated antibodies are generally valuable for various immunological techniques including Western blotting, immunohistochemistry, and other immunodetection methods . The conjugation provides a direct detection system that eliminates the need for secondary antibody incubation steps, potentially reducing background noise and increasing assay specificity. These conjugates are particularly useful when investigating the expression, localization, and interactions of PURA protein in diverse experimental contexts, ranging from cell culture studies to tissue analysis.

How should I optimize the dilution of PURA Antibody, HRP conjugated for ELISA applications?

Optimizing dilution of PURA Antibody, HRP conjugated for ELISA requires a systematic titration approach. Begin with manufacturer's recommended dilution range (typically 1:500-1:5000 for antibody working solutions) . Perform a checkerboard titration by preparing serial dilutions of both the antibody and your target antigen. For each dilution, evaluate signal-to-noise ratio by comparing specific signal against background readings from negative controls. The optimal dilution should provide maximum signal with minimal background interference.

Consider these methodological steps:

  • Prepare serial dilutions of the PURA Antibody-HRP (e.g., 1:500, 1:1000, 1:2000, 1:5000)

  • For each antibody dilution, test against varying antigen concentrations

  • Include proper controls: blank wells (no antigen, no antibody), negative controls (no antigen, with antibody), and positive controls

  • Analyze data to identify the dilution providing optimal detection sensitivity while maintaining low background

  • Utilize a stabilizing diluent such as HRP Conjugate Stock Stabilizer (diluted to 1X working concentration) to maintain conjugate integrity during the optimization process

This methodical approach ensures reliable and reproducible results for your specific experimental conditions.

What buffer systems are recommended for storing and diluting PURA Antibody, HRP conjugated?

For optimal storage and dilution of PURA Antibody, HRP conjugated, specialized buffer systems are recommended to maintain both antibody specificity and HRP enzymatic activity. A key consideration is using HRP Conjugate Stock Stabilizer, which when diluted to its 1X working concentration, helps preserve the functional integrity of both the HRP enzyme and immunoglobulin components . This proprietary formulation maintains the native three-dimensional conjugate structure during storage while enhancing the interaction between the IgG component and target antigen .

For dilution purposes:

  • Add 1 part HRP Conjugate Stock Stabilizer (5X) to 4 parts deionized water and mix thoroughly for 5-15 minutes

  • Add the PURA antibody-HRP conjugate directly into this diluent to achieve your working dilution

  • Mix gently for 5-15 minutes to ensure homogeneous distribution

For storage:

  • Store protected from light at 2-8°C

  • 1X working dilutions can be stored at 2-8°C when protected from light

  • Maintain pH between 6.5-7.5, as maleimide conjugation linkages remain stable in this range and are minimally susceptible to hydrolysis

  • Avoid repeated freeze-thaw cycles which can compromise both antibody binding and HRP activity

These buffer conditions help prevent contamination issues and extend the functional utility of the conjugate while inhibiting non-specific binding to plate coating proteins .

How can I verify successful HRP conjugation to PURA antibody?

Verification of successful HRP conjugation to PURA antibody can be achieved through multiple analytical approaches. One recommended method involves determining the HRP to protein ratio using spectrophotometric measurements . This process typically includes:

  • Measure absorbance at 280 nm (A280) for protein concentration and at 403 nm (A403) for HRP determination

  • Calculate the molar ratio using extinction coefficients (ε280 for antibody and ε403 for HRP)

  • Optimal conjugates typically have 2-4 HRP molecules per antibody

Functional verification can be performed by:

  • Running a Western blot with known PURA-expressing samples (e.g., human brain tissue lysate)

  • Comparing signal intensity between the conjugated antibody and a traditional primary-secondary antibody detection system

  • Evaluating specificity through appropriate controls (including competing peptides or knockout samples)

Additionally, ELISA-based functionality tests provide further confirmation:

  • Coat plate with target antigen or use a sandwich approach with capture antibody

  • Add serial dilutions of the HRP-conjugated PURA antibody

  • Develop with appropriate substrate (e.g., TMB)

  • Compare results to standard curves generated with known functioning HRP-conjugated antibodies

This multi-faceted verification approach ensures both the chemical success of the conjugation and the functional integrity of the final reagent.

How can I use PURA Antibody, HRP conjugated to investigate PURA's role in transcriptional regulation?

Investigating PURA's role in transcriptional regulation using HRP-conjugated PURA antibody requires sophisticated experimental designs that leverage the direct detection capabilities of this conjugate. PURA is known to specifically bind the purine-rich single strand of the PUR element located upstream of the MYC gene and may function as a transcription activator . To elucidate its regulatory mechanisms:

  • Chromatin Immunoprecipitation (ChIP) with direct detection:

    • Crosslink protein-DNA interactions in cells of interest

    • Sonicate chromatin to appropriate fragment sizes

    • Immunoprecipitate with PURA Antibody, HRP conjugated

    • Detect bound complexes directly using chemiluminescence substrates

    • Elute and analyze DNA fragments through qPCR or sequencing to identify binding regions

  • Transcription factor ELISA:

    • Immobilize oligonucleotides containing putative PURA binding sequences

    • Incubate with nuclear extracts

    • Detect bound PURA using the HRP-conjugated antibody

    • Quantify binding through colorimetric or chemiluminescent readout

  • Co-regulatory protein interaction studies:

    • Immunoprecipitate retinoblastoma protein or RNA polymerase II

    • Detect co-precipitated PURA using the HRP-conjugated antibody in Western blot format

    • Alternatively, develop sandwich ELISA systems to quantify these interactions

These approaches provide direct insights into PURA's DNA binding patterns, transcriptional targets, and co-regulatory protein networks, expanding our understanding of its role in transcriptional regulation.

What are the potential pitfalls when using PURA Antibody, HRP conjugated for multiplex immunoassays?

When employing PURA Antibody, HRP conjugated in multiplex immunoassays, researchers must navigate several technical challenges. The primary complexities arise from potential cross-reactivity issues and signal interference between detection systems.

Key pitfalls and mitigation strategies include:

  • Cross-reactivity concerns:

    • PURA antibodies may exhibit varying degrees of cross-reactivity with homologous proteins

    • Problem: False positive signals that compromise assay specificity

    • Solution: Perform extensive validation with appropriate controls including knockout/knockdown samples and competing peptides

  • HRP substrate compatibility in multiplex settings:

    • Problem: Substrate diffusion between detection zones can create signal bleeding

    • Solution: Optimize spatial separation between detection areas and consider sequential substrate addition protocols

  • Signal magnitude discrepancies:

    • PURA detection may produce signals of significantly different intensity compared to other targets

    • Problem: Dominant signals can mask weaker ones when using shared detection systems

    • Solution: Carefully balance antibody concentrations and utilize signal normalization algorithms during data analysis

  • HRP inactivation by sample components:

    • Problem: Sample-specific components may inhibit HRP activity

    • Solution: Incorporate appropriate blocking reagents and consider using HRP Conjugate Stock Stabilizer which contains components that maintain conjugate integrity

  • Molecular weight considerations:

    • PURA has potential phosphorylation sites which may explain its migration at a higher molecular weight than predicted (approximately 42 kDa versus the predicted 35 kDa)

    • Problem: This variability can complicate multiplexed analysis

    • Solution: Include molecular weight markers and conduct thorough validation studies

By anticipating these challenges and implementing appropriate controls and optimization strategies, researchers can maximize the reliability of multiplex immunoassays involving PURA Antibody, HRP conjugated.

How can I troubleshoot unexpected molecular weight observations when detecting PURA using HRP-conjugated antibodies?

PURA protein often presents unexpected molecular weight patterns in immunodetection experiments, which can complicate result interpretation. The predicted molecular weight of PURA is approximately 35 kDa, but it frequently migrates at a higher molecular weight around 42 kDa . This discrepancy requires systematic troubleshooting approaches:

  • Understanding post-translational modifications:

    • PURA contains multiple potential phosphorylation sites that affect electrophoretic mobility

    • Confirm modification status using:

      • Phosphatase treatment of samples prior to SDS-PAGE

      • Parallel detection with phospho-specific antibodies

      • Mass spectrometry analysis of immunoprecipitated PURA

  • Sample preparation considerations:

    • Evaluate different lysis buffers and their effects on PURA detection

    • Test various reducing agent concentrations to ensure complete protein denaturation

    • Optimize heating conditions (temperature and duration) to prevent aggregation or degradation

  • Gel system optimization:

    • Compare different polyacrylamide percentages to improve resolution in the 35-45 kDa range

    • Evaluate gradient gels versus fixed percentage gels

    • Consider native versus denaturing conditions to assess multimerization

  • Antibody specificity verification:

    • Perform peptide competition assays to confirm signal specificity

    • Compare detection patterns across multiple tissue types with known PURA expression levels

    • Include recombinant PURA protein as a positive control

  • Detection system troubleshooting:

    • Optimize substrate incubation time when using the HRP-conjugated antibody

    • Compare different HRP substrates for optimal signal-to-noise ratio

    • Consider signal enhancement systems if sensitivity is limiting

By methodically addressing these factors, researchers can accurately interpret PURA detection results despite its non-standard migration pattern in electrophoretic analyses.

How does the sensitivity of PURA Antibody, HRP conjugated compare to traditional two-step detection methods?

Sensitivity comparison:

Detection ParameterPURA Antibody, HRP ConjugatedTwo-Step Detection Method
Detection limitTypically higher (less sensitive)Often lower (more sensitive)
Signal amplificationNone - 1:1 binding ratioSignificant - multiple secondary antibodies can bind each primary
Background noiseGenerally lowerPotentially higher due to secondary antibody cross-reactivity
Time efficiencyFaster (single incubation)Slower (two separate incubations)
Protocol complexitySimplerMore complex
Sample consumptionLowerHigher

To optimize results with HRP-conjugated PURA antibody:

  • Use specialized HRP Conjugate Stock Stabilizer to maintain conjugate integrity

  • Extend substrate incubation time to enhance signal development

  • Consider signal enhancement systems for critical low-abundance applications

  • Optimize blocking conditions to improve signal-to-noise ratio

The choice between these approaches should be guided by experimental requirements, with direct conjugates favored for routine detection and two-step methods reserved for applications requiring maximum sensitivity.

What are the recommended protocols for using PURA Antibody, HRP conjugated in different experimental systems?

Optimized protocols for PURA Antibody, HRP conjugated vary based on the experimental system. Here are tailored methodologies for three common research applications:

ELISA Protocol:

  • Coating: Adsorb capture antibody or antigen to microplate (100 μL/well, overnight at 4°C)

  • Blocking: 200 μL/well blocking buffer (typically 1-5% BSA in PBS), 1-2 hours at room temperature

  • Sample addition: Add diluted samples and standards (100 μL/well), incubate 1-2 hours at room temperature

  • Detection: Add PURA Antibody, HRP conjugated diluted in HRP Conjugate Stock Stabilizer (1X working concentration) at recommended dilution (1:500-1:5000) , incubate 1 hour at room temperature

  • Development: Add 100 μL/well TMB substrate, monitor color development (typically 5-30 minutes)

  • Stop reaction: Add 100 μL/well stop solution (usually 2N H₂SO₄)

  • Read: Measure absorbance at 450 nm with 570 nm reference wavelength

Western Blot Protocol:

  • Protein separation: Load 10-30 μg total protein per lane on appropriate percentage SDS-PAGE gel

  • Transfer: Transfer proteins to nitrocellulose membrane

  • Blocking: Incubate membrane in 5% non-fat dry milk or 3% BSA in TBST for 1 hour at room temperature

  • Primary detection: Add PURA Antibody, HRP conjugated diluted in blocking buffer (1:500-1:5000) , incubate overnight at 4°C

  • Washing: Wash membrane 3-5 times with TBST, 5 minutes each

  • Development: Apply chemiluminescent substrate compatible with HRP (such as Azure Radiance ECL) and detect signal

Immunocytochemistry Protocol:

  • Fixation: Fix cells with 4% paraformaldehyde, 15 minutes at room temperature

  • Permeabilization: 0.1-0.5% Triton X-100 in PBS, 10 minutes at room temperature

  • Blocking: 5% normal serum in PBS, 1 hour at room temperature

  • Detection: Apply diluted PURA Antibody, HRP conjugated (1:500-1:1000) in blocking buffer, incubate overnight at 4°C

  • Washing: Wash 3-5 times with PBS, 5 minutes each

  • Substrate: Apply DAB or other peroxidase substrate

  • Counterstain: Optional hematoxylin nuclear counterstain

  • Mounting: Mount with appropriate medium and visualize

Each protocol should be optimized based on specific sample types, target abundance, and experimental goals.

How can I extend the shelf life and maintain optimal activity of PURA Antibody, HRP conjugated?

Maximizing the shelf life and activity of PURA Antibody, HRP conjugated requires careful attention to storage conditions, handling practices, and stabilization chemistry. The following comprehensive approach integrates best practices from multiple sources:

Optimal Storage Conditions:

  • Temperature management:

    • Store concentrated stock at 2-8°C, never freeze HRP conjugates unless specifically recommended by manufacturer

    • Avoid temperature fluctuations which can accelerate protein denaturation and enzyme inactivation

    • For long-term storage (>1 month), aliquot to minimize freeze-thaw cycles

  • Buffer composition:

    • Use HRP Conjugate Stock Stabilizer diluted to its 1X working concentration for dilution and storage

    • This specialized formulation maintains the functional integrity of both the HRP enzyme and immunoglobulin components

    • Ensure pH remains between 6.5-7.5, as maleimide linkages are most stable in this range

  • Protection from destabilizing factors:

    • Store protected from light to prevent photooxidation of the heme group in HRP

    • Include antimicrobial agents (present in commercial stabilizers) to prevent contamination

    • Avoid exposure to oxidizing agents and heavy metals which can inactivate HRP

Usage Recommendations:

  • Prepare working dilutions just before use when possible

  • If working dilutions must be stored, maintain them at 2-8°C protected from light

  • When removing from storage, allow solutions to equilibrate to room temperature before opening to prevent condensation

  • Use only clean, protein-low binding tubes and pipette tips for handling

  • Avoid introducing bubbles which can denature proteins at air-liquid interfaces

By implementing these evidence-based practices, researchers can significantly extend the usable lifetime of PURA Antibody, HRP conjugated preparations, ensuring consistent performance across experiments and reducing reagent costs.

How can PURA Antibody, HRP conjugated be used to investigate PURA's interaction with retinoblastoma protein and RNA polymerase II?

Investigating PURA's interactions with retinoblastoma protein and RNA polymerase II using HRP-conjugated PURA antibody enables direct visualization of these critical protein complexes. These interactions are fundamental to PURA's role in cell division and DNA transcription . Several advanced methodological approaches can be employed:

  • Proximity Ligation Assay (PLA) with direct detection:

    • Fix and permeabilize cells expressing PURA, retinoblastoma protein, and RNA polymerase II

    • Incubate with PURA Antibody, HRP conjugated and antibodies against interaction partners (conjugated to complementary oligonucleotides)

    • Perform ligation and rolling circle amplification

    • Visualize interaction signals through direct HRP-mediated chromogenic or chemiluminescent detection

    • This approach allows visualization of endogenous protein interactions with high specificity and sensitivity

  • Co-immunoprecipitation with direct detection:

    • Prepare cell/tissue lysates under non-denaturing conditions

    • Immunoprecipitate retinoblastoma protein or RNA polymerase II

    • Resolve proteins by SDS-PAGE and transfer to membrane

    • Detect co-precipitated PURA directly using HRP-conjugated PURA antibody

    • This streamlined approach eliminates secondary antibody incubation steps and reduces background

  • Chromatin Immunoprecipitation-reChIP:

    • Perform sequential ChIP using antibodies against retinoblastoma protein or RNA polymerase II followed by PURA Antibody, HRP conjugated

    • Utilize HRP activity for direct elution through substrate-mediated release

    • Analyze recovered DNA sequences to identify genomic regions where PURA co-localizes with its interaction partners

    • This technique identifies specific genomic contexts where these protein interactions occur

These methodologies provide complementary insights into the molecular mechanisms through which PURA exerts its regulatory functions in transcription and cell cycle control, with the HRP conjugation enabling direct detection with reduced background interference.

What are the latest developments in using HRP-conjugated antibodies for super-resolution microscopy?

Recent advances in super-resolution microscopy techniques have expanded the utility of HRP-conjugated antibodies, including PURA Antibody, HRP conjugated, beyond traditional applications. These developments leverage the catalytic activity of HRP to generate localized precipitates or fluorescent products that can be detected with nanoscale precision.

Emerging techniques include:

  • APEX/HRP-mediated proximity labeling for correlative light-electron microscopy:

    • HRP-conjugated antibodies catalyze the local deposition of DAB (3,3'-diaminobenzidine) in the presence of H₂O₂

    • The resulting precipitate can be detected by both light microscopy and electron microscopy

    • This approach enables visualization of PURA localization at ultrastructural resolution

    • Particularly valuable for studying nuclear subdomains where PURA functions in transcription regulation

  • CLEM (Correlative Light and Electron Microscopy) with HRP enhancement:

    • HRP-conjugated PURA antibody catalyzes the deposition of electron-dense precipitates

    • These precipitates provide contrast in electron microscopy while maintaining compatibility with fluorescence detection

    • Enables correlation between PURA's dynamic behavior (from light microscopy) and its precise subcellular localization (from electron microscopy)

  • HRP-CLARITY for 3D tissue imaging:

    • HRP-conjugated antibodies are used with CLARITY-processed tissues

    • The catalytic activity generates fluorescent products that can be imaged in three dimensions

    • Allows mapping of PURA distribution across complex tissue architectures with cellular resolution

    • Particularly valuable for studying PURA's role in neural tissues where its function is highly relevant

  • Single-molecule HRP amplification systems:

    • Utilizes the catalytic cycle of HRP to generate thousands of fluorescent molecules per antibody

    • Enables detection of low-abundance PURA molecules that would otherwise be below detection threshold

    • Can be combined with photoactivation techniques for sequential detection in multiplexed imaging

These methodological advances extend the capabilities of HRP-conjugated antibodies beyond traditional biochemical assays into the realm of high-resolution spatial analysis, offering new insights into PURA's subcellular distribution and functional interactions.

How can I optimize the bioconjugation process when preparing custom PURA Antibody, HRP conjugates?

Optimizing the bioconjugation process for creating custom PURA Antibody, HRP conjugates requires precise control over multiple parameters to achieve optimal conjugate performance. This comprehensive approach draws on established bioconjugation principles applicable to PURA and other target antibodies.

Critical optimization parameters include:

  • Selection of conjugation chemistry:

    • Heterobifunctional cross-linkers like Sulfo-SMCC are recommended for generating maleimide-activated HRP that reacts with sulfhydryl groups on antibodies

    • Alternative consideration: For PURA antibodies with limited available lysines, periodate oxidation of HRP glycosyl groups can be used to generate aldehyde groups that react with primary amines

  • Antibody preparation:

    • Thiolation using SATA (N-Succinimidyl S-Acetylthioacetate) introduces controlled numbers of sulfhydryl groups

    • Antibody:SATA molar ratios should be optimized (typically 1:5 to 1:20) to achieve desired conjugation levels

    • Buffer exchange into conjugation buffer (typically pH 6.5-7.5 phosphate buffer) using desalting columns

  • Optimization of HRP:antibody ratio:

    • Test multiple molar ratios (typically 2:1 to 10:1 HRP:antibody)

    • Balance between:

      • Too few HRP molecules = insufficient sensitivity

      • Too many HRP molecules = potential loss of antibody binding capacity

    • Evaluate conjugate performance across ratio range to identify optimal formulation

  • Reaction conditions:

    • Temperature: Generally performed at room temperature (20-25°C)

    • Duration: Typically 2-4 hours, optimize by testing multiple timepoints

    • pH: Maintain between 6.5-7.5 to ensure maleimide stability while preserving antibody function

    • Protect from light during conjugation to prevent photooxidation of the heme group

  • Purification strategy:

    • Size exclusion chromatography to separate conjugates from unreacted components

    • Consider affinity purification to select for functional conjugates

    • Avoid harsh conditions that might compromise HRP activity

  • Stabilization of final conjugate:

    • Formulate in HRP Conjugate Stock Stabilizer to maintain the functional integrity of the conjugate

    • Add protein stabilizers (typically 0.1-1% BSA) and antimicrobial agents

    • Consider lyophilization for maximum long-term stability

By systematically optimizing these parameters, researchers can develop PURA Antibody, HRP conjugates with optimal sensitivity, specificity, and stability for their specific research applications.

What emerging applications are being developed for PURA Antibody, HRP conjugated in neuroscience research?

PURA protein has significant implications in neuroscience research, with emerging applications for PURA Antibody, HRP conjugated reflecting this importance. The protein's role in DNA replication and transcriptional regulation has direct relevance to neuronal development and function, opening several innovative research avenues.

Emerging applications include:

  • Investigation of PURA in neurodevelopmental disorders:

    • PURA mutations are associated with neurodevelopmental conditions

    • HRP-conjugated antibodies enable direct visualization of PURA distribution in neural tissues

    • Applications in both animal models and patient-derived samples provide insights into pathological mechanisms

    • Direct detection with reduced background interference is particularly valuable in heterogeneous neural tissues

  • Single-cell analysis of PURA expression patterns:

    • Combining HRP-conjugated PURA antibodies with microfluidic systems

    • Enables high-throughput screening of PURA expression across neural cell populations

    • HRP signal amplification provides sensitivity needed for detecting subtle expression differences

    • Correlation with cell type-specific markers reveals functional specialization

  • Activity-dependent PURA regulation studies:

    • HRP-conjugated antibodies in time-resolved detection systems

    • Monitoring PURA localization changes in response to neuronal activation

    • Investigation of PURA's role in activity-dependent gene expression

    • Potential insights into learning and memory mechanisms

  • PURA in neuroinflammatory processes:

    • Examination of PURA regulation in glial cells during inflammatory responses

    • HRP-mediated detection in complex tissue microenvironments

    • Potential implications for neurodegenerative and neuroinflammatory conditions

    • Integration with multiplex detection systems to analyze PURA in conjunction with inflammatory markers

These emerging applications harness the direct detection capabilities of HRP-conjugated PURA antibodies to illuminate the protein's complex roles in neural function, with significant implications for understanding both normal neurodevelopment and neurological disorders.

How can PURA Antibody, HRP conjugated be integrated into high-throughput screening platforms?

Integration of PURA Antibody, HRP conjugated into high-throughput screening (HTS) platforms enables rapid, sensitive detection of PURA protein across large sample sets. This integration requires careful consideration of assay design, automation compatibility, and data analysis methodologies.

Key integration strategies include:

  • Microplate-based ELISA adaptation:

    • Optimize PURA Antibody, HRP conjugated concentration (1:500-1:5000) for maximum signal-to-noise ratio

    • Implement automated liquid handling systems for consistent reagent dispensing

    • Standardize plate washing parameters to minimize well-to-well variability

    • Develop quality control metrics including Z-factor calculation for assay validation

    • HRP Conjugate Stock Stabilizer can improve consistency by maintaining conjugate integrity across screening runs

  • Multiplex bead-based assays:

    • Couple capture antibodies against PURA to spectrally distinct microbeads

    • Detect bound PURA with HRP-conjugated PURA antibodies (for sandwich format)

    • Utilize flow cytometry or dedicated bead analyzers for high-throughput readout

    • Enable simultaneous analysis of PURA alongside other proteins of interest

  • Automated Western blotting platforms:

    • Implement PURA Antibody, HRP conjugated in capillary-based automated Western systems

    • Optimize antibody concentration and incubation conditions for these specialized platforms

    • Account for the observed higher molecular weight migration pattern of PURA (approximately 42 kDa instead of predicted 35 kDa)

    • Enable quantitative comparison across large sample sets

  • High-content screening integration:

    • Utilize PURA Antibody, HRP conjugated with precipitating substrates for cellular imaging

    • Implement automated microscopy with standardized image acquisition settings

    • Develop image analysis algorithms to quantify PURA expression, localization, and co-localization patterns

    • Enable multiparametric analysis correlating PURA with cellular phenotypes

  • Data management and analysis pipeline:

    • Implement laboratory information management systems (LIMS) to track samples and assay conditions

    • Develop standardized data processing workflows for consistent analysis

    • Incorporate machine learning approaches for pattern recognition in complex datasets

    • Enable integration with other -omics datasets for comprehensive analysis

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