NDUFB11 Antibody

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Description

Definition and Biological Context

NDUFB11 antibody is an immunological reagent designed to bind specifically to the NDUFB11 protein (17.3 kDa), an accessory subunit of mitochondrial Complex I (NADH:ubiquinone oxidoreductase). This protein is encoded by the NDUFB11 gene located on chromosome Xp11.23 and is essential for maintaining structural integrity rather than direct catalytic activity in the electron transport chain .

Research Applications

NDUFB11 antibodies are employed in:

  • Western blotting: Detects the 17–20 kDa band in mitochondrial lysates (e.g., HeLa, HepG2, A431 cells) .

  • Immunohistochemistry: Localizes NDUFB11 in formalin-fixed tissues (e.g., human kidney) .

  • Flow cytometry: Identifies intracellular protein expression in fixed cells .

  • Disease studies: Used to investigate NDUFB11 downregulation in atherosclerosis and venous thrombosis, where reduced expression correlates with poor prognosis .

Validation and Quality Control

Key validation data include:

  • Band specificity: Single bands at expected molecular weights in WB across cell lines .

  • Knockout validation: Reduced signal in CRISPR/Cas9-edited cell models (not explicitly shown in sources but implied by antibody providers’ quality assurances).

  • Cross-reactivity: Proteintech’s antibody reacts with human, mouse, and rat samples, while Abcam’s is human-specific .

Clinical and Mechanistic Insights

NDUFB11 antibodies have revealed critical findings:

  • Disease associations:

    • Reduced NDUFB11 levels in endothelial cells correlate with mitochondrial dysfunction in atherosclerosis and venous thrombosis .

    • Mutations in NDUFB11 are linked to mitochondrial Complex I deficiency disorders, including linear skin defects and microphthalmia syndrome .

  • Functional networks: NDUFB11 interacts with 55 proteins, including TIMMDC1 and CRELD2, suggesting roles beyond electron transport .

Product Specs

Buffer
PBS with 0.02% Sodium Azide, 50% Glycerol, pH 7.3. Store at -20°C. Avoid repeated freeze-thaw cycles.
Lead Time
Typically, we can ship your order within 1-3 business days of receiving it. Delivery times may vary depending on the shipping method and location. Please consult your local distributor for specific delivery times.
Synonyms
NDUFB11; UNQ111/PRO1064; NADH dehydrogenase [ubiquinone] 1 beta subcomplex subunit 11, mitochondrial; Complex I-ESSS; CI-ESSS; NADH-ubiquinone oxidoreductase ESSS subunit; Neuronal protein 17.3; Np17.3; p17.3
Target Names
Uniprot No.

Target Background

Function
NDUFB11 is an accessory subunit of the mitochondrial membrane respiratory chain NADH dehydrogenase (Complex I). While believed to not be directly involved in catalysis, it plays a crucial role in the overall function of Complex I. Complex I facilitates the transfer of electrons from NADH to the respiratory chain, with ubiquinone being considered the immediate electron acceptor.
Gene References Into Functions
  1. A recurring mutation, c.276_278del, p.F93del, has been identified in NDUFB11, a mitochondrial respiratory complex I-associated protein encoded on the X chromosome, in 5 males exhibiting a variable syndromic, normocytic congenital sideroblastic anemia. PMID: 27488349
  2. This report, along with previous findings, expands the molecular spectrum and associated clinical phenotype of NDUFB11 defects, highlighting the diverse clinical presentations associated with NDUFB11 mutations. PMID: 27102574
  3. The novel NDUFB11 mutation may contribute to a complex 1 deficiency in synergy with additional unknown mtDNA variants. PMID: 25921236
  4. Mutations in NDUFB11, encoding a complex I component of the mitochondrial respiratory chain, are known to cause microphthalmia with linear skin defects syndrome. PMID: 25772934
  5. Research indicates that post-transcriptional regulation of the Ndufb11 gene can be involved in the programmed cell death process. PMID: 23246602
  6. In a study of 65 individuals from 35 Italian Leber hereditary optic neuropathy patients, NDUFB11 did not appear to influence the risk or age at onset of visual loss. PMID: 17292333

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Database Links

HGNC: 20372

OMIM: 252010

KEGG: hsa:54539

UniGene: Hs.521969

Involvement In Disease
Linear skin defects with multiple congenital anomalies 3 (LSDMCA3); Mitochondrial complex I deficiency (MT-C1D)
Protein Families
Complex I NDUFB11 subunit family
Subcellular Location
Mitochondrion inner membrane; Single-pass membrane protein.
Tissue Specificity
Ubiquitous.

Q&A

What is NDUFB11 and what is its functional significance in mitochondrial research?

NDUFB11 is an accessory subunit of the mitochondrial membrane respiratory chain NADH dehydrogenase (Complex I) that functions in the transfer of electrons from NADH to the respiratory chain. While not directly involved in catalysis, it is essential for complex I assembly and activity . Also known as neuronal protein 17.3, Complex I-ESSS, or p17.3, NDUFB11 is located in the inner mitochondrial membrane . The immediate electron acceptor for the enzyme is believed to be ubiquinone .

Research has demonstrated that NDUFB11 is crucial for:

  • Complex I assembly and structural integrity

  • Cellular energy production via oxidative phosphorylation

  • Cell growth and survival

Knockdown experiments using shRNA have confirmed that NDUFB11 is essential for these functions, underscoring its importance in mitochondrial research .

What applications are validated for NDUFB11 antibodies?

NDUFB11 antibodies have been validated for multiple research applications, as summarized in the table below:

ApplicationValidated DilutionsSample TypesNotes
Western Blot (WB)1:1000-1:4000HepG2 cells, mouse/rat skeletal muscle tissueMost widely validated application
Immunohistochemistry (IHC)1:50-1:500Human kidney tissue, paraffin sectionsMay require specific antigen retrieval methods
Immunofluorescence (IF)/ICC1:50-1:500HepG2 cells, HeLa cellsEffective for subcellular localization studies
Immunoprecipitation (IP)0.5-4.0 μg per 1.0-3.0 mg lysateMouse skeletal muscle tissueUseful for interaction studies
Flow Cytometry1:240 (ab183716)Paraformaldehyde-fixed cellsValidated for intracellular detection

When selecting an antibody, researchers should verify the specific applications validated by the manufacturer and optimize conditions for their particular experimental system .

What is the molecular weight of NDUFB11 and how should researchers interpret Western blot results?

NDUFB11 has a calculated molecular weight of approximately 17-18 kDa, with observed molecular weights typically between 18-20 kDa on SDS-PAGE . The variations in observed molecular weight may be attributed to post-translational modifications or differences in gel systems used.

When interpreting Western blot results:

  • Expected band size: 17-20 kDa

  • Number of amino acids: 163 aa

  • The protein may run slightly higher than the calculated molecular weight due to post-translational modifications

What sample preparation methods are recommended for optimal NDUFB11 detection?

For optimal detection of NDUFB11 across different applications, consider the following sample preparation methods:

For Western Blot:

  • Use a lysis buffer containing 0.02% sodium azide and 50% glycerol at pH 7.3 for tissue homogenization

  • Include protease inhibitors to prevent degradation

  • For mitochondrial enrichment, consider differential centrifugation techniques

For Immunohistochemistry:

  • Suggested antigen retrieval: TE buffer at pH 9.0 or citrate buffer at pH 6.0

  • Paraformaldehyde fixation is recommended for tissue sections

  • Optimal section thickness: 4-6 μm for paraffin-embedded tissues

For Immunofluorescence:

  • Paraformaldehyde fixation (typically 4%) for 15-20 minutes

  • Permeabilization with 0.1-0.5% Triton X-100

  • Blocking with 1-5% BSA or normal serum

For Complex I Activity Studies:

  • Blue Native Gel Electrophoresis (BNGE) is recommended when studying NDUFB11 in the context of Complex I assembly

  • In-gel activity assays can assess functional consequences of NDUFB11 deficiency

How can NDUFB11 antibodies be used to study Complex I assembly defects?

NDUFB11 antibodies serve as valuable tools for investigating Complex I assembly defects, particularly in mitochondrial disorders. Research has demonstrated that:

  • Assembly analysis: NDUFB11 antibodies can be used in Blue Native Gel Electrophoresis (BNGE) to assess Complex I assembly status. In patients with NDUFB11 mutations, Western blotting of BNGE shows reduced amounts of holocomplex I .

  • Functional assessment: In-gel activity assays combined with NDUFB11 immunodetection can reveal correlations between protein levels and Complex I activity. Studies have shown that NDUFB11 deficiency results in marked reduction or undetectable activity of Complex I .

  • Rescue experiments: Lentiviral transduction of wild-type NDUFB11 into patient fibroblasts with NDUFB11 mutations has been used to confirm pathogenicity. Successful rescue is evidenced by:

    • Increased NDUFB11 protein levels

    • Recovery of holocomplex I amount (~50% compared to untransduced cells)

    • Marked increase in Complex I activity

  • Structural impact beyond NDUFB11: Importantly, NDUFB11 deficiency affects other Complex I subunits, including NDUFS1 and NDUFA9, located in different regions of the complex. This indicates NDUFB11's role in maintaining the integrity of the entire complex structure, not just the membrane arm .

When designing such studies, researchers should consider complementary approaches such as oxygen consumption measurements and supercomplex analysis to comprehensively characterize the functional consequences of NDUFB11 defects.

What are the key considerations when validating NDUFB11 knockdown or knockout models?

When validating NDUFB11 knockdown or knockout models, researchers should implement a comprehensive validation strategy:

  • Protein level validation: Use Western blot with reliable NDUFB11 antibodies to confirm reduction in protein levels. Published studies show drastic reduction in NDUFB11 steady-state levels in patient fibroblasts with NDUFB11 mutations .

  • Complex I structural integrity: Assess the impact on other Complex I subunits, including:

    • NDUFS1 (located in the hydrophilic arm)

    • NDUFA9 (located at the junction between hydrophobic and hydrophilic arms)

    This is crucial as NDUFB11 deficiency affects the assembly of the entire Complex I structure .

  • Functional validation: Implement multiple approaches:

    • Blue Native Gel Electrophoresis (BNGE) with in-gel activity assays

    • Oxygen consumption measurements

    • ATP production assays

    • Mitochondrial membrane potential assessment

  • Rescue experiments: Transduction with wild-type NDUFB11 should restore:

    • Protein levels (confirm by Western blot)

    • Complex I assembly (confirm by BNGE)

    • Complex I activity (confirm by in-gel activity assays)

  • Cell growth and viability: NDUFB11 is essential for cell growth and survival, so knockdown/knockout models should exhibit compromised viability that can be rescued by wild-type NDUFB11 expression .

It's important to note that complete knockout of NDUFB11 may not be viable in certain cell types, as shRNA-mediated NDUFB11 knockdown has demonstrated essential roles in cell growth and survival .

How do NDUFB11 antibodies contribute to understanding pathological conditions like MLS syndrome?

NDUFB11 antibodies have been instrumental in elucidating the molecular basis of Microphthalmia with Linear Skin defects (MLS) syndrome, an X-linked male-lethal disorder:

  • Genotype-phenotype correlations: Antibody-based studies have confirmed that heterozygous mutations in NDUFB11 lead to complete inactivation of Complex I in patients with MLS syndrome, revealing an unexpected role of Complex I dysfunction in this developmental phenotype .

  • Tissue-specific effects: Immunohistochemistry using NDUFB11 antibodies has helped researchers investigate the tissue-specific manifestations of NDUFB11 deficiency, particularly in affected tissues like skin and eyes .

  • Molecular pathogenesis: Studies combining genetic analysis with NDUFB11 antibody-based protein detection have demonstrated that:

    • NDUFB11 is essential for Complex I assembly and activity

    • Complete inactivation of Complex I underlies MLS syndrome

    • NDUFB11 defects represent a group of mitochondrial diseases with neurocutaneous manifestations

  • Diagnostic applications: NDUFB11 antibodies can be used for:

    • Assessing NDUFB11 protein levels in patient samples

    • Evaluating the impact of NDUFB11 mutations on protein stability and Complex I assembly

    • Confirming pathogenicity of novel NDUFB11 variants

These studies highlight the importance of NDUFB11 in mitochondrial function and development, establishing NDUFB11 mutations as a cause of MLS syndrome and expanding our understanding of mitochondrial diseases associated with neurocutaneous manifestations .

What is the relationship between NDUFB11 expression and cardiovascular conditions?

Recent research has revealed important connections between NDUFB11 expression and cardiovascular pathologies:

  • Atherosclerosis and venous thrombosis: Bioinformatic analyses and experimental validation have demonstrated that NDUFB11 is downregulated in atherosclerosis and venous thrombosis, suggesting a potential role in these conditions .

  • Prognostic implications: Lower expression levels of NDUFB11 are associated with poorer prognosis in patients with atherosclerosis and venous thrombosis, indicating its potential value as a biomarker .

  • Co-expression patterns: NDUFB11 shows co-expression patterns with another Complex I component, NDUFS3, in the context of cardiovascular disease. Both genes are:

    • Downregulated in atherosclerosis with venous thrombosis samples

    • Upregulated in normal samples

    • Associated with arterial diseases, atherosclerosis, arteritis, venous thrombosis formation, and venous thromboembolism

  • Research applications: NDUFB11 antibodies can be used to:

    • Quantify NDUFB11 expression in vascular tissues

    • Compare expression levels between normal and pathological samples

    • Correlate NDUFB11 levels with disease severity or progression

These findings suggest that NDUFB11 may serve as a potential biomarker for atherosclerosis and venous thrombosis, opening new avenues for research into the role of mitochondrial dysfunction in cardiovascular disease pathogenesis .

What troubleshooting approaches should researchers consider when facing inconsistent NDUFB11 antibody signals?

When encountering inconsistent NDUFB11 antibody signals, researchers should systematically troubleshoot using the following approaches:

  • Antibody selection considerations:

    • Monoclonal vs. polyclonal: Monoclonal antibodies (like ab183716 and CF807792) offer higher specificity but may be sensitive to epitope masking, while polyclonal antibodies (like 16720-1-AP and DF12300) recognize multiple epitopes but may show higher background

    • Validated applications: Ensure the antibody is validated for your specific application (WB, IHC, IF, etc.)

    • Species reactivity: Verify compatibility with your sample species (human, mouse, rat)

  • Sample preparation optimization:

    • Extraction buffers: PBS with 0.02% sodium azide and 50% glycerol at pH 7.3 is recommended for many NDUFB11 antibodies

    • Antigen retrieval: For IHC, test both TE buffer (pH 9.0) and citrate buffer (pH 6.0)

    • Protein denaturation: Ensure complete denaturation for Western blot applications

  • Detection system troubleshooting:

    • Dilution optimization: Titrate antibody dilutions (recommended ranges: WB 1:1000-1:4000; IHC 1:50-1:500; IF 1:50-1:500)

    • Incubation conditions: Optimize temperature and duration

    • Secondary antibody matching: Ensure proper host species compatibility

  • Positive and negative controls:

    • Positive tissue/cell controls: HepG2 cells, mouse/rat skeletal muscle tissue, and human kidney tissue have been validated for various NDUFB11 antibodies

    • Genetic controls: Consider using NDUFB11 knockdown samples as negative controls

    • Rescue controls: Cells transduced with wild-type NDUFB11 can serve as specificity controls

  • Subcellular localization verification:

    • NDUFB11 is a mitochondrial protein, so signals should localize to mitochondria

    • Co-staining with mitochondrial markers can verify proper localization

    • Mitochondrial enrichment may improve detection in challenging samples

By systematically addressing these factors, researchers can optimize NDUFB11 detection and ensure consistent, reliable results across different experimental conditions.

How can NDUFB11 antibodies be employed in mitochondrial disease research beyond MLS syndrome?

NDUFB11 antibodies have applications in studying various mitochondrial disorders beyond MLS syndrome:

  • Complex I deficiency disorders:

    • NDUFB11 antibodies can assess Complex I assembly status in patients with suspected Complex I deficiency

    • Quantitative analysis of NDUFB11 levels can help classify the severity of Complex I defects

    • Correlation of NDUFB11 levels with clinical phenotypes may identify new genotype-phenotype relationships

  • Neurodegenerative diseases:

    • Mitochondrial dysfunction is implicated in various neurodegenerative conditions

    • NDUFB11 antibodies can assess Complex I integrity in brain tissue from patients with Parkinson's disease, Alzheimer's disease, or amyotrophic lateral sclerosis

    • Changes in NDUFB11 levels or localization may provide insights into disease mechanisms

  • Metabolic disorders:

    • Complex I dysfunction contributes to metabolic syndromes

    • NDUFB11 antibody-based studies can investigate relationships between Complex I defects and metabolic dysregulation

    • Tissue-specific alterations in NDUFB11 expression may identify metabolically affected tissues

  • Aging research:

    • Mitochondrial function declines with age

    • NDUFB11 antibodies can assess age-related changes in Complex I composition and integrity

    • Correlation of NDUFB11 levels with markers of cellular senescence may provide insights into aging mechanisms

When designing such studies, researchers should consider using multiple antibodies targeting different Complex I subunits to comprehensively assess Complex I status and combine antibody-based detection with functional assays to establish causal relationships.

What are the best practices for quantifying NDUFB11 expression levels in patient samples?

For accurate quantification of NDUFB11 expression in patient samples, researchers should follow these best practices:

  • Sample collection and processing:

    • Standardize collection procedures to minimize variability

    • Process samples immediately or flash-freeze to preserve protein integrity

    • For tissue biopsies, consider using mitochondrial enrichment protocols to enhance detection sensitivity

  • Quantitative Western blot approach:

    • Use recombinant NDUFB11 standards for absolute quantification

    • Include multiple loading controls:

      • Mitochondrial markers (e.g., VDAC, COX4) to normalize for mitochondrial content

      • Housekeeping proteins (e.g., β-actin, GAPDH) for total protein normalization

    • Implement technical replicates (minimum of three) and biological replicates

    • Use digital imaging systems with linear dynamic range for quantification

  • Immunohistochemical quantification:

    • Standardize staining protocols with consistent antibody dilutions (1:50-1:500 recommended)

    • Use automated image analysis software for objective quantification

    • Include calibration standards on each slide

    • Perform parallel analysis with multiple markers to assess mitochondrial content

  • Flow cytometry for blood cells or cultured fibroblasts:

    • Permeabilize cells appropriately for this mitochondrial protein

    • Use validated dilutions (e.g., 1:240 for flow cytometry)

    • Include isotype controls and unstained controls

    • Consider dual staining with mitochondrial markers

  • Reference ranges and controls:

    • Establish age- and tissue-matched control reference ranges

    • Include samples from patients with known NDUFB11 mutations as positive disease controls

    • Consider using fibroblasts transduced with wild-type NDUFB11 as rescue controls

  • Data normalization and statistical analysis:

    • Normalize NDUFB11 levels to mitochondrial content markers

    • Apply appropriate statistical tests based on data distribution

    • Consider correlation with clinical parameters for diagnostic/prognostic value assessment

This systematic approach ensures reliable quantification of NDUFB11 expression in patient samples, facilitating accurate diagnosis and research into mitochondrial disorders.

How can co-immunoprecipitation with NDUFB11 antibodies reveal novel protein interactions?

Co-immunoprecipitation (Co-IP) using NDUFB11 antibodies offers a powerful approach to discover novel protein interactions and gain insights into Complex I assembly and regulation:

  • Experimental design considerations:

    • Antibody selection: Choose NDUFB11 antibodies validated for IP applications (e.g., 16720-1-AP has been validated for IP in mouse skeletal muscle tissue)

    • Sample preparation: Use mild lysis conditions to preserve protein-protein interactions

    • Recommended protocol: 0.5-4.0 μg antibody per 1.0-3.0 mg of total protein lysate

    • Controls: Include IgG control IPs and input samples for comparison

  • Potential interaction partners to investigate:

    • Other Complex I subunits: Particularly those in physical proximity within the complex

    • Assembly factors: Proteins involved in Complex I biogenesis and quality control

    • Regulatory proteins: Kinases, phosphatases, or other modifiers that may regulate NDUFB11 function

    • Novel interactors: Proteins not previously associated with Complex I function

  • Analytical approaches:

    • Standard approach: Western blot analysis with antibodies against suspected interacting proteins

    • Discovery approach: Mass spectrometry analysis of co-immunoprecipitated proteins

    • Validation: Reciprocal Co-IPs using antibodies against identified interaction partners

    • Structural context: Interpret findings in the context of Complex I structural data

  • Methodological considerations:

    • Cross-linking: Consider mild cross-linking to stabilize transient interactions

    • Detergent selection: Use digitonin or other mild detergents to preserve membrane protein interactions

    • Mitochondrial isolation: For some applications, using purified mitochondria rather than whole cell lysates may improve specificity

    • Buffer optimization: Adjust salt and pH conditions to optimize interaction detection

  • Biological significance assessment:

    • Functional validation: Investigate the functional consequences of disrupting identified interactions

    • Disease relevance: Determine if interactions are altered in disease states

    • Evolutionary conservation: Assess whether interactions are conserved across species

This approach can reveal novel insights into NDUFB11's role in Complex I assembly, regulation, and dysfunction in disease states, potentially identifying new therapeutic targets for mitochondrial disorders.

What considerations should researchers keep in mind when using NDUFB11 as a biomarker for cardiovascular disease?

When utilizing NDUFB11 as a biomarker for cardiovascular diseases such as atherosclerosis and venous thrombosis, researchers should consider:

  • Expression pattern characteristics:

    • NDUFB11 is downregulated in atherosclerosis and venous thrombosis samples compared to normal tissues

    • It shows coordinated expression with NDUFS3, another Complex I component, suggesting potential co-regulation

    • Lower expression levels correlate with poorer prognosis in both conditions

  • Methodological standardization:

    • Sample collection: Standardize procedures for collecting vascular tissue, blood, or other relevant samples

    • Processing protocols: Develop consistent protocols for sample processing and storage

    • Detection methods: Validate antibody-based detection methods specifically for cardiovascular tissues

    • Quantification approach: Establish reliable quantification methods with appropriate controls

  • Clinical correlation parameters:

    • Disease severity: Correlate NDUFB11 levels with established markers of disease severity

    • Disease progression: Consider longitudinal studies to assess NDUFB11 changes over time

    • Treatment response: Evaluate NDUFB11 expression changes in response to therapeutic interventions

    • Risk stratification: Determine if NDUFB11 levels can predict disease complications or outcomes

  • Mechanistic investigations:

    • Functional consequences: Assess how altered NDUFB11 expression affects mitochondrial function in vascular cells

    • Causal relationships: Determine whether NDUFB11 downregulation is a cause or consequence of disease

    • Therapeutic targeting: Explore whether restoring NDUFB11 expression has beneficial effects

    • Pathway interactions: Investigate relationships between NDUFB11, oxidative stress, and inflammation in vascular pathology

  • Multi-marker approach:

    • Combined assessment: Evaluate NDUFB11 alongside NDUFS3 for improved predictive value

    • Complementary markers: Include established cardiovascular biomarkers for comprehensive assessment

    • Tissue-specific patterns: Compare NDUFB11 expression across different vascular beds and blood cells

By addressing these considerations, researchers can effectively harness the potential of NDUFB11 as a biomarker for cardiovascular diseases, potentially improving risk stratification, diagnosis, and personalized treatment approaches.

What are the recommended protocols for detecting NDUFB11 in different experimental setups?

Below are optimized protocols for detecting NDUFB11 across various experimental applications:

Western Blot Protocol for NDUFB11:

  • Sample preparation:

    • Lyse cells/tissues in buffer containing PBS with 0.02% sodium azide and 50% glycerol at pH 7.3

    • Include protease inhibitors and maintain samples at 4°C

    • Determine protein concentration using Bradford or BCA assay

  • SDS-PAGE:

    • Load 20-30 μg protein per lane (based on validated protocols)

    • Use 12-15% gels to properly resolve the 18-20 kDa NDUFB11 protein

    • Include molecular weight markers spanning 10-25 kDa range

  • Transfer and detection:

    • Transfer to PVDF membrane (recommended over nitrocellulose for small proteins)

    • Block with 5% non-fat milk or BSA in TBST

    • Incubate with primary antibody at 1:1000-1:4000 dilution overnight at 4°C

    • Wash 3-5 times with TBST

    • Incubate with appropriate HRP-conjugated secondary antibody

    • Develop using ECL or other chemiluminescent detection systems

Immunohistochemistry Protocol:

  • Sample preparation:

    • Fix tissues in 4% paraformaldehyde

    • Process and embed in paraffin

    • Section at 4-6 μm thickness

  • Antigen retrieval and staining:

    • Deparaffinize and rehydrate sections

    • Perform antigen retrieval with TE buffer pH 9.0 (primary recommendation) or citrate buffer pH 6.0 (alternative)

    • Block endogenous peroxidase with 3% H₂O₂

    • Block non-specific binding with 5-10% normal serum

    • Incubate with NDUFB11 antibody at 1:50-1:500 dilution

    • Apply appropriate detection system (HRP/DAB recommended)

    • Counterstain with hematoxylin

    • Dehydrate, clear, and mount

Immunofluorescence Protocol:

  • Cell preparation:

    • Culture cells on coverslips or chamber slides

    • Fix with 4% paraformaldehyde for 15 minutes at room temperature

    • Permeabilize with 0.1-0.5% Triton X-100

  • Staining procedure:

    • Block with 5% BSA or normal serum

    • Incubate with NDUFB11 antibody at 1:50-1:500 dilution overnight at 4°C

    • Wash thoroughly with PBS

    • Incubate with fluorophore-conjugated secondary antibody

    • Counterstain nuclei with DAPI

    • Mount with anti-fade mounting medium

Flow Cytometry Protocol:

  • Cell preparation:

    • Harvest cells and fix with paraformaldehyde

    • Permeabilize thoroughly (critical for this mitochondrial protein)

  • Staining procedure:

    • Block with 5% BSA in PBS

    • Incubate with NDUFB11 antibody at approximately 1:240 dilution

    • Wash thoroughly

    • Incubate with fluorophore-conjugated secondary antibody

    • Analyze using appropriate laser and filter settings

These protocols should be optimized for specific experimental conditions and antibodies used.

How should researchers approach the validation of novel NDUFB11 mutations in patient samples?

A comprehensive approach to validating novel NDUFB11 mutations in patient samples should include:

  • Genetic analysis:

    • Sequencing: Confirm the mutation by Sanger sequencing or next-generation sequencing

    • Segregation analysis: Test family members to confirm inheritance patterns (X-linked in the case of NDUFB11)

    • Population frequency: Check databases like gnomAD to confirm the variant is rare or absent in control populations

    • In silico prediction: Use tools like SIFT, PolyPhen, or MutationTaster to predict pathogenicity

  • Protein expression analysis:

    • Western blot: Assess NDUFB11 protein levels in patient samples (typically fibroblasts) using validated antibodies

    • Expected findings: Patients with pathogenic mutations typically show markedly reduced NDUFB11 protein levels

    • Comparison: Include age-matched controls and known pathogenic mutations if available

  • Complex I assembly and function:

    • Blue Native Gel Electrophoresis (BNGE): Assess Complex I assembly status

    • In-gel activity assay: Determine Complex I enzymatic activity

    • Spectrophotometric assays: Measure Complex I activity in isolated mitochondria

    • Oxygen consumption: Measure cellular respiration using Seahorse or oxygen electrode

  • Functional complementation:

    • Lentiviral transduction: Introduce wild-type NDUFB11 into patient cells

    • Western blot verification: Confirm restoration of NDUFB11 protein levels

    • Complex I assembly: Verify recovery of holocomplex I amount

    • Functional rescue: Demonstrate improvement in Complex I activity

  • Phenotypic correlation:

    • Clinical assessment: Compare patient phenotype with known NDUFB11-related conditions

    • Tissue-specific effects: Investigate tissue samples relevant to clinical manifestations

    • Biomarkers: Assess lactate levels and other markers of mitochondrial dysfunction

The experimental evidence from a previously validated case illustrates this approach:

  • A patient with p.93delF mutation in NDUFB11 showed markedly reduced NDUFB11 protein levels

  • Complex I assembly and activity were compromised

  • Lentiviral transduction with wild-type NDUFB11 restored protein levels and Complex I function

  • The biochemical phenotype correlated with clinical manifestations of complex I deficiency

This systematic approach provides robust validation of novel NDUFB11 mutations and establishes their pathogenicity.

What are the critical controls needed when studying NDUFB11 in experimental models?

When studying NDUFB11 in experimental models, several critical controls should be included to ensure reliable and interpretable results:

  • Antibody validation controls:

    • Positive tissue controls: Include samples known to express NDUFB11 (e.g., HepG2 cells, mouse/rat skeletal muscle tissue, human kidney tissue)

    • Knockdown/knockout controls: Use NDUFB11 siRNA/shRNA treated samples or CRISPR-Cas9 generated knockout cells when available

    • Overexpression controls: Cells transfected with NDUFB11 expression constructs

    • Peptide competition: Pre-incubate antibody with immunogen peptide to confirm specificity

    • Multiple antibodies: Use antibodies targeting different epitopes to confirm findings

  • Expression manipulation controls:

    • Empty vector controls: For overexpression studies, include cells transfected with empty vector

    • Scrambled siRNA/shRNA: For knockdown studies, include non-targeting control sequences

    • Rescue controls: For mutation studies, include cells transduced with wild-type NDUFB11

    • Dose-response: When applicable, use varying levels of expression manipulation

  • Functional assessment controls:

    • Other Complex I subunits: Assess other components (e.g., NDUFS1, NDUFA9) to understand complex-wide effects

    • Other respiratory complexes: Measure Complexes II-V to determine specificity of effects

    • Chemical inhibitors: Use rotenone as a positive control for Complex I inhibition

    • Known Complex I deficient samples: Include cells from patients with established Complex I defects

  • Technical controls:

    • Loading controls: Use appropriate housekeeping proteins or mitochondrial markers

    • Sample preparation controls: Process all samples simultaneously under identical conditions

    • Biological replicates: Use multiple independent biological samples

    • Technical replicates: Perform multiple technical replicates of each experiment

  • Physiological relevance controls:

    • Cell type specificity: Compare findings across multiple relevant cell types

    • Species conservation: Validate key findings in models from different species

    • Environmental conditions: Assess effects under normal and stressed conditions (e.g., hypoxia, nutrient deprivation)

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