CYC7 Antibody

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Description

Overview of Cytokeratin 7 (CK7) Antibody

CK7 antibodies target cytokeratin 7, an intermediate filament protein expressed in glandular and transitional epithelial tissues. These antibodies are used to distinguish between carcinomas of different origins, such as lung, breast, and gastrointestinal tract malignancies .

Research Findings on CK7 Antibody Development

A 2024 study characterized a novel rabbit monoclonal CK7 antibody (Clone BC1) and compared it to the traditional mouse monoclonal OV-TL 12/30 :

Key Results:

  • Superior Staining Intensity: BC1 showed stronger signal clarity compared to OV-TL 12/30, particularly in debris-rich samples .

  • Multiplex Assay Utility: BC1 was validated in a 4-step double-stain assay combined with CDX2 and TTF1 for lung vs. colon cancer discrimination .

  • Specificity Validation: Western blotting confirmed reactivity with CK7 in HeLa cell lysates, with no cross-reactivity to non-epithelial tissues .

Diagnostic Applications in Pathology

CK7 antibodies are integral to immunohistochemical panels:

Clinical Use Cases:

  • Adenocarcinoma Subtyping:

    • CK7+/CK20–: Suggests lung or breast origin.

    • CK7–/CK20+: Indicates colorectal origin .

  • Metastasis Identification: CK7 helps differentiate primary lung tumors from metastatic gastrointestinal cancers .

Performance Metrics:

Antibody CloneTarget EpitopeStaining IntensityDebris Compatibility
RM284 C-terminal CK7HighModerate
BC1 C-terminal CK7Very HighHigh

Validation and Quality Control

Recent efforts highlight the importance of rigorous antibody characterization:

  • Knockout (KO) Validation: Superior specificity confirmation compared to Western blot controls .

  • Commercial Reagent Standards: Approximately 20% of commercial CK7 antibodies fail validation, emphasizing the need for third-party testing .

Limitations and Considerations

  • Tissue-Specific Variability: CK7 is absent in prostate cancers but variably expressed in ovarian and bile duct malignancies .

  • False Positives: Debris in necrotic samples may require optimized protocols for accurate interpretation .

Product Specs

Buffer
Preservative: 0.03% Proclin 300
Constituents: 50% Glycerol, 0.01M PBS, pH 7.4
Form
Liquid
Lead Time
Made-to-order (14-16 weeks)
Synonyms
CYC7 antibody; CYP3 antibody; YEL039CCytochrome c isoform 2 antibody; Iso-2-cytochrome c antibody; Cytochrome c hypoxic isoform antibody
Target Names
CYC7
Uniprot No.

Target Background

Function
Cytochrome c is an electron carrier protein. In its oxidized state, the cytochrome c heme group accepts an electron from the heme group of the cytochrome c1 subunit of ubiquinol-cytochrome c oxidoreductase. Subsequently, cytochrome c transfers this electron to the dinuclear copper A center (CU(A)) of the COX2 subunit of cytochrome oxidase, the terminal protein in the mitochondrial electron-transport chain. Isoform 2 (CYC7) is the predominant cytochrome c under anaerobic/hypoxic conditions.
Database Links

KEGG: sce:YEL039C

STRING: 4932.YEL039C

Protein Families
Cytochrome c family
Subcellular Location
Mitochondrion intermembrane space.

Q&A

What validation methods should be used to confirm CYC7 Antibody specificity?

Proper validation of antibody specificity is essential for generating reliable research data. Several complementary approaches should be employed:

  • Western blot analysis using positive and negative control samples, including knockout (KO) cell lines when available

  • Immunoprecipitation followed by mass spectrometry to confirm target identity

  • Immunofluorescence in cells with known expression patterns of the target protein

  • Parallel testing with multiple antibodies against the same target

  • Genetic manipulation of target expression (overexpression and knockdown/knockout)

Approximately 50% of commercial antibodies fail to meet basic standards for characterization, resulting in financial losses of $0.4–1.8 billion per year in the United States alone . Therefore, researchers should never rely on a single validation method and should thoroughly document their validation approach in publications. The YCharOS initiative has developed consensus protocols for antibody validation using knockout cell lines that can be particularly valuable for verifying specificity .

What applications is CYC7 Antibody typically suitable for in laboratory research?

Like other research antibodies, CYC7 Antibody may be suitable for various applications depending on its specific properties. Common applications include:

  • Western blotting (WB)

  • Immunoprecipitation (IP)

  • Immunofluorescence (IF)

  • Flow cytometry

  • Chromatin immunoprecipitation (ChIP)

  • Immunohistochemistry (IHC)

It's critical to note that antibodies rarely perform equally well across all applications. The NeuroMab initiative has demonstrated that ELISA-positive antibodies may not necessarily perform well in other common assays . Therefore, researchers should verify that the specific CYC7 Antibody they intend to use has been validated for their particular application and experimental conditions. For flow cytometric staining, the suggested use is typically 5 μl per million cells or 5 μl per 100 μl of whole blood, but optimal concentrations should be determined for each specific application .

How should researchers address lot-to-lot variability with CYC7 Antibody?

Lot-to-lot variability represents a significant concern with research antibodies. To address this issue:

  • Document the specific lot number used in each experiment

  • Perform validation tests on each new lot received

  • Create a reference sample set for comparative testing

  • Maintain detailed records of antibody performance across different lots

  • When possible, purchase larger quantities of a single lot for long-term studies

The Research Resource Identifier (RRID) program can help track antibodies, but it's important to note that different lots of the same manufacturer's antibody will have the same RRID, even if there may be significant variation between lots . Therefore, recording lot numbers separately is essential for research reproducibility.

What are the optimal storage conditions for maintaining CYC7 Antibody activity?

While specific storage recommendations should be obtained from the manufacturer, general best practices for antibody storage include:

  • Store concentrated antibody stocks at -20°C or -80°C in small aliquots to avoid repeated freeze-thaw cycles

  • For working dilutions, store at 4°C with appropriate preservatives (such as sodium azide at 0.02%)

  • Avoid exposure to direct light, especially for fluorophore-conjugated antibodies

  • Monitor for signs of degradation (precipitation, loss of activity)

  • Follow manufacturer's recommendations for stability period

Proper storage is critical for maintaining antibody performance over time. Researchers should document storage conditions when reporting methods to enhance reproducibility.

What information should researchers document when using CYC7 Antibody in publications?

To ensure research reproducibility, publications should include:

  • Complete antibody identification:

    • Manufacturer and catalog number

    • Clone designation (for monoclonal antibodies)

    • Lot number

    • Research Resource Identifier (RRID)

  • Validation evidence:

    • Specificity confirmation methods used

    • Controls included in the experiments

    • References to previous validation studies

  • Detailed methodological information:

    • Exact concentrations/dilutions used

    • Incubation conditions (time, temperature)

    • Buffer compositions

    • Sample preparation details

The lack of proper reporting of antibody details has contributed significantly to the reproducibility crisis in biomedical research . Improving documentation practices is essential for addressing this issue.

How can researchers troubleshoot non-specific binding issues with CYC7 Antibody?

Non-specific binding is a common challenge when working with antibodies. Advanced troubleshooting approaches include:

  • Optimization of blocking conditions:

    • Test different blocking agents (BSA, milk, serum)

    • Adjust blocking time and temperature

    • Consider commercial blocking reagents designed to reduce background

  • Buffer optimization:

    • Adjust salt concentration to increase stringency

    • Test different detergents and concentrations

    • Modify pH conditions if compatible with antibody stability

  • Cross-adsorption techniques:

    • Pre-adsorb antibody with tissue/cell lysates from systems lacking the target

    • Use peptide competition assays to demonstrate specificity

  • Advanced validation:

    • Compare results from genetic models (knockout/knockdown systems)

    • Perform immunodepletion experiments

    • Conduct parallel experiments with alternative antibodies

The YCharOS initiative has developed consensus protocols for Western blots, immunoprecipitation, and immunofluorescence that can help address non-specific binding issues . Their approach using knockout cell lines provides a robust method to distinguish specific from non-specific signals.

How should researchers interpret discrepancies in results between different application methods using CYC7 Antibody?

Discrepancies between different applications (e.g., positive signal in Western blot but negative in immunofluorescence) require careful analysis:

  • Consider epitope accessibility issues:

    • Protein conformation differences between applications

    • Post-translational modifications affecting epitope recognition

    • Protein-protein interactions masking epitopes in certain conditions

  • Evaluate fixation and sample preparation effects:

    • Different fixatives may affect epitope structure differently

    • Denaturation versus native conditions

    • Cross-linking can alter epitope accessibility

  • Perform additional validation experiments:

    • Use alternative antibodies targeting different epitopes

    • Complement with non-antibody-based detection methods

    • Employ genetic approaches (overexpression, knockdown)

What are the current recommended standards for CYC7 Antibody validation in publication-quality research?

Based on current antibody characterization standards highlighted in recent initiatives:

  • Minimum validation requirements:

    • Demonstration of target specificity using knockout/knockdown controls

    • Verification of performance in the specific application and experimental conditions

    • Lot-specific validation data

    • Full documentation of antibody source, catalog number, lot number, and RRID

  • Advanced validation approaches:

    • Independent validation using orthogonal methods

    • Testing across multiple cell types/tissues

    • Comparison with alternative antibodies targeting the same protein

    • Mass spectrometry confirmation of immunoprecipitated targets

  • Documentation standards:

    • Detailed methods sections including antibody dilutions and incubation conditions

    • Inclusion of all relevant controls in figure panels

    • Transparent reporting of optimization steps

    • Availability of raw, unprocessed data

The antibody characterization crisis has led to increasing journal requirements for comprehensive validation data and unique identifiers for antibodies used in publications .

How can researchers differentiate between CYC7 Antibody signals and technical artifacts in challenging experimental systems?

Distinguishing genuine signals from artifacts requires systematic approach:

  • Implement comprehensive controls:

    • Biological negative controls (knockout/knockdown systems)

    • Technical negative controls (isotype-matched antibodies, secondary-only)

    • Peptide competition controls

    • Signal gradient analyses across varying protein expression levels

  • Apply reciprocal confirmation strategies:

    • Validate findings using antibodies targeting different epitopes

    • Compare monoclonal versus polyclonal antibody results

    • Correlate antibody-based findings with non-antibody detection methods

    • Utilize orthogonal approaches to confirm biological effects

  • Employ quantitative analysis techniques:

    • Signal-to-noise ratio quantification

    • Colocalization coefficients with known markers

    • Statistical analysis across multiple biological replicates

    • Titration series to establish signal specificity

Initiatives like YCharOS have shown that systematic testing of antibodies using knockout cell lines can effectively distinguish between specific signals and technical artifacts .

What quantitative approaches can be used to determine the binding affinity and kinetics of CYC7 Antibody?

For researchers requiring detailed binding characterization:

  • Surface Plasmon Resonance (SPR):

    • Provides real-time kinetic measurements (kon, koff)

    • Determines equilibrium dissociation constant (KD)

    • Allows analysis under various buffer conditions

  • Bio-Layer Interferometry (BLI):

    • Similar to SPR but with different detection principle

    • Useful for crude sample analysis

    • High-throughput capability

  • Isothermal Titration Calorimetry (ITC):

    • Label-free detection of binding

    • Provides complete thermodynamic profile (ΔH, ΔS, ΔG)

    • Works with solution-phase interactions

  • Microscale Thermophoresis (MST):

    • Measures changes in thermophoretic mobility upon binding

    • Requires minimal sample amounts

    • Works with native proteins in complex solutions

When reporting binding parameters, researchers should include the specific method used, experimental conditions, and statistical analysis of replicate measurements to ensure reproducibility.

What controls are essential when using CYC7 Antibody in multicolor flow cytometry experiments?

For flow cytometry applications, researchers should implement:

  • Essential controls:

    • Unstained controls for autofluorescence assessment

    • Single-color controls for compensation

    • Fluorescence-minus-one (FMO) controls to set gating boundaries

    • Isotype controls matched to CYC7 Antibody class and concentration

    • Biological negative controls (cells not expressing target)

  • Advanced control strategies:

    • Titration series to determine optimal antibody concentration

    • Blocking peptide controls to confirm specificity

    • Secondary-only controls for indirect staining

    • Dead cell discrimination to eliminate false positives

Each lot of antibody should be independently validated for flow cytometry applications, as performance can vary significantly between lots and applications. The recommended use for flow cytometric staining is typically 5 μl per million cells or 5 μl per 100 μl of whole blood, but this should be optimized for each specific application .

How should researchers design experiments to address epitope masking when using CYC7 Antibody?

Epitope masking can significantly impact antibody performance. Advanced strategies include:

  • Sample preparation variations:

    • Test multiple fixation methods (paraformaldehyde, methanol, acetone)

    • Evaluate different permeabilization reagents and concentrations

    • Investigate antigen retrieval techniques (heat-induced, enzymatic)

  • Experimental design approaches:

    • Use multiple antibodies targeting different epitopes

    • Compare results across different applications (WB, IF, IP)

    • Test native vs. denatured conditions

  • Biochemical strategies:

    • Investigate effects of detergents on protein-protein interactions

    • Assess impact of reducing agents on disulfide bonds

    • Evaluate enzymatic treatments to remove potential modifications

Systematic documentation of these variations is essential for troubleshooting inconsistent results and ensuring reproducibility across laboratories.

What are the methodological considerations for using CYC7 Antibody in chromatin immunoprecipitation (ChIP) experiments?

For ChIP applications, specialized optimization is required:

  • Chromatin preparation considerations:

    • Optimize crosslinking conditions (formaldehyde concentration and time)

    • Determine ideal sonication parameters for fragment size

    • Evaluate chromatin quality by DNA purification and sizing

  • Immunoprecipitation optimization:

    • Titrate antibody amounts relative to chromatin input

    • Test different bead types and blocking conditions

    • Optimize wash stringency to balance specificity and yield

  • Controls and validation:

    • Include IgG control matched to host species

    • Use biological controls (gene knockout, target protein depletion)

    • Compare results with published ChIP-seq datasets

    • Validate enrichment using qPCR at known binding sites

The use of recombinant antibodies, which offer greater consistency than monoclonal antibodies derived from hybridomas, may be particularly valuable for ChIP applications where reproducibility is essential .

How can researchers determine if CYC7 Antibody is suitable for detecting post-translational modifications?

For researchers interested in post-translational modifications (PTMs):

  • Specificity validation approaches:

    • Test with recombinant proteins with and without the specific modification

    • Use competing peptides with defined modification status

    • Compare detection before and after enzymatic removal of modifications

    • Utilize cells treated with modification-inducing or inhibiting compounds

  • Experimental design considerations:

    • Include appropriate phosphatase/deacetylase inhibitors during sample preparation

    • Optimize extraction conditions to preserve labile modifications

    • Consider enrichment steps to detect low-abundance modified forms

  • Advanced validation strategies:

    • Correlation with mass spectrometry data

    • Genetic manipulation of modifying enzymes

    • Site-directed mutagenesis of modified residues

    • Correlation with other PTM-specific antibodies

Detailed characterization data should be provided by antibody manufacturers, but independent validation is always recommended for critical experiments involving PTM detection.

What data analysis approaches are recommended for quantitative Western blots using CYC7 Antibody?

For quantitative Western blot analysis:

  • Experimental design requirements:

    • Include standard curve with recombinant protein or calibrated samples

    • Run multiple technical and biological replicates

    • Use appropriate loading controls validated for your experimental system

    • Include samples spanning expected dynamic range

  • Image acquisition considerations:

    • Use systems with documented linear detection range

    • Avoid saturated signals that prevent accurate quantification

    • Capture sufficient bit depth for sensitive detection of differences

    • Maintain consistent exposure settings across replicates

  • Quantification methodologies:

    • Normalization strategies (total protein vs. housekeeping proteins)

    • Background subtraction approaches

    • Use of integrated density vs. peak height measurements

    • Statistical analysis of replicate measurements

The consensus protocols developed by YCharOS for Western blot analysis provide valuable guidelines for quantitative applications and can help ensure reproducibility across laboratories .

What are the comparative performance metrics for antibody validation methods?

Validation MethodSpecificity AssessmentSensitivity DetectionProtocol ComplexityRequired EquipmentResource RequirementTime Investment
Western Blot with KO ControlsHighModerateModerateStandard lab equipmentModerate1-2 days
Immunoprecipitation-Mass SpecVery HighHighHighMS instrument access requiredHigh3-5 days
Immunofluorescence with KO ControlsHighModerate-HighModerateFluorescence microscopeModerate1-2 days
ELISAModerateHighLowPlate readerLow-Moderate4-8 hours
Flow CytometryHighVery HighModerateFlow cytometerModerate4-8 hours
Peptide CompetitionModerateN/ALowApplication-dependentLowApplication + 4-8 hours
Orthogonal Target ModulationVery HighVariableHighApplication-dependentHighDays-Weeks

This table highlights the relative strengths of different validation approaches. As demonstrated by multiple antibody characterization initiatives, combining multiple methods provides the most robust validation .

How do different sample preparation methods affect antibody performance in immunohistochemistry?

Fixation MethodEpitope PreservationMorphology PreservationProtocol DurationCommon ApplicationsLimitations
4% ParaformaldehydeModerateGood24-48 hoursFFPE tissue sections, cultured cellsMay mask some epitopes, requires optimization of antigen retrieval
MethanolVariableModerate10-30 minutesCytoskeletal proteins, some nuclear targetsPoor for membrane proteins, can disrupt some epitopes
AcetoneVariablePoor-Moderate5-10 minutesFrozen sections, cytospinsPoor morphology preservation, rapid processing required
GlutaraldehydePoorExcellent1-24 hoursUltrastructural studiesSignificant autofluorescence, severe epitope masking
Heat-mediated fixationModerateModerateVariableRapid processingInconsistent results, limited application scope
Zinc-based fixativesGoodGood24-48 hoursAlternative to formalin for some antigensLimited commercial availability, specialized protocols

The choice of fixation method significantly impacts antibody performance. As demonstrated by NeuroMab's screening process, antibodies are often tested against cells fixed and permeabilized using protocols that mimic those used for subsequent evaluation by immunohistochemistry .

What are the practical considerations for recombinant antibody formats compared to traditional monoclonal antibodies?

CharacteristicTraditional Monoclonal AntibodiesRecombinant AntibodiesPractical Implications
ReproducibilityModerate (lot-to-lot variation)Very HighRecombinant format eliminates hybridoma drift issues
Long-term availabilityVariable (hybridoma-dependent)High (sequence-based)Recombinant antibodies can be reproduced indefinitely from sequence
Production scalabilityModerateHighRecombinant systems offer greater flexibility in production
Genetic engineering potentialLimitedHighEnables creation of custom formats and fusion proteins
Host species dependencyHighLowRecombinant production reduces animal usage
CostVariableInitially higherLong-term advantages may offset higher initial costs
Validation documentationVariableIncreasingly comprehensiveRecombinant antibodies often have better characterization data

As highlighted by initiatives like NeuroMab/NABOR, converting the best monoclonal antibodies into recombinant formats and making sequences publicly available can significantly advance research reproducibility .

What concentrations and conditions are optimal for different CYC7 Antibody applications?

ApplicationTypical Concentration RangeBuffer ConditionsIncubation ParametersCritical Optimization Factors
Western Blot0.1-1 μg/mLTBST or PBST with 3-5% blocking agent1-16 hours at 4°C or room temperatureBlocking agent selection, antibody dilution, washing stringency
Immunofluorescence1-10 μg/mLPBS with 1-5% blocking agent, 0.1-0.3% detergent1-16 hours at 4°C or room temperatureFixation method, permeabilization conditions, mounting media
Flow Cytometry5 μl per million cells PBS with 0.5-2% BSA or serum30-60 minutes at 4°CTitration for optimal signal-to-noise, viability dye selection
Immunoprecipitation1-10 μg per sampleRIPA or NP-40 based buffersOvernight at 4°CBead type, pre-clearing steps, washing conditions
ELISA0.1-2 μg/mLCarbonate buffer (coating), PBST (detection)Coating: overnight at 4°C; Detection: 1-2 hours at RTBlocking optimization, sample dilution, standard curve range
ChIP2-10 μg per IPTE buffer with protease inhibitorsOvernight at 4°CChromatin quality, antibody-to-chromatin ratio, wash stringency

As noted in search result , for flow cytometric staining, the suggested use is 5 μl per million cells or 5 μl per 100 μl of whole blood, but it is recommended that the reagent be titrated for optimal performance for each application.

What initiatives and resources are available to help researchers with antibody validation?

Initiative/ResourceFocus AreaKey ContributionsAccessibilityLimitationsReference
YCharOSCharacterization of existing antibodiesConsensus protocols, testing in Western blots, IP, and IF using KO cell linesOpen access databaseLimited proteome coverage to date
NeuroMabGeneration of monoclonal antibodies for neuroscienceExtensive validation in brain tissues, sequence availabilityAvailable through DSHBPrimarily focused on neuroscience targets
Research Resource Identifier (RRID)Unique identifiers for research resourcesTracking antibodies across literatureOpen resourceDoes not perform validation, same RRID for different lots
Protein Capture Reagent ProgramGeneration of antibodies targeting human transcription factorsCollection of 1406 monoclonal antibodies for 737 human proteinsAvailable through DSHBLimited to transcription factors
CiteAbAntibody search engine based on citationsLinks to published usage and characterization dataFree search capabilityRelies on existing literature
SciScoreAlgorithm for research resource identificationAutomated identification of reagent information in publicationsAvailable to journals and authorsAnalysis tool, not a validation resource

These initiatives represent significant efforts to address the "antibody characterization crisis" through different but complementary approaches . Researchers are encouraged to utilize these resources when selecting and validating antibodies for their experimental systems.

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