ZNF160 Antibody

What is ZNF160 and what is its biological significance?

ZNF160, also known as KIAA1611, Zinc finger protein HZF5, or Zinc finger protein Kr18, is a member of the Krüppel-type zinc finger protein family involved in transcriptional regulation . The protein contains multiple C2H2-type zinc finger domains that enable sequence-specific DNA binding, allowing it to function as a transcription factor. ZNF160's biological significance stems from its presumed role in regulating gene expression programs, though specific target genes and pathways remain areas of active investigation.

ZNF160's precise functions continue to be characterized, but like other zinc finger proteins, it likely contributes to developmental processes, cellular differentiation, and potentially disease states when dysregulated. Understanding its function requires reliable antibody-based detection methods to study its expression, localization, and interactions.

What are the structural characteristics of ZNF160 protein?

ZNF160 is a 94 kDa protein in its full-length form . The protein contains multiple zinc finger domains, predominantly of the C2H2 type, which are responsible for its DNA-binding capabilities. These domains typically contain conserved cysteine and histidine residues that coordinate zinc ions to form finger-like projections that interact with DNA.

The N-terminal region (approximately amino acids 1-179) contains functionally important domains that are often targeted by antibodies . Particularly, the region spanning amino acids 150-179 is commonly used as an immunogen for antibody production, suggesting this region contains accessible and immunogenic epitopes .

How should I select tissue or cell models for studying ZNF160?

Based on available data, ZNF160 can be reliably detected in several human cell lines, including:

When initiating studies of ZNF160, these cell lines serve as appropriate positive controls. U87-MG cells have been successfully used for intracellular flow cytometry, suggesting they maintain proper epitope accessibility for antibody binding in fixed and permeabilized conditions .

How do I choose between polyclonal and monoclonal antibodies for ZNF160 detection?

The choice between polyclonal and monoclonal antibodies for ZNF160 detection depends on your experimental goals:

Polyclonal Antibodies (e.g., ABIN2392489, ABIN955682):

• Recognize multiple epitopes on ZNF160, potentially increasing detection sensitivity

• Useful for applications where signal amplification is beneficial, such as detecting low-abundance ZNF160

• May provide more robust detection across different sample preparation methods

• Examples include rabbit polyclonal antibodies targeting the N-terminal region (AA 150-179)

Monoclonal Antibodies (e.g., EPR12523):

• Recognize a single epitope, providing higher specificity

• Superior for quantitative comparisons across experiments due to batch-to-batch consistency

• Preferred for applications requiring high reproducibility

• Examples include rabbit recombinant monoclonal antibody EPR12523, which has been validated for IP, WB, and flow cytometry

When experimentally critical, use both antibody types to confirm findings, as they provide complementary advantages.

What validation methods should I use to confirm ZNF160 antibody specificity?

Proper validation of ZNF160 antibodies is essential for generating reliable research data. Implement these comprehensive validation strategies:

• Positive and negative controls:

  • Use cell lines with known ZNF160 expression (SW480, U87-MG) as positive controls

  • Include isotype controls (rabbit IgG) for flow cytometry experiments

  • Consider knockdown/knockout validation using siRNA or CRISPR-Cas9

• Multiple detection methods:

  • Confirm findings across different techniques (WB, IP, flow cytometry)

  • The EPR12523 antibody has been validated across multiple methods and shows consistency

• Epitope competition:

  • Pre-incubate antibody with immunizing peptide to demonstrate signal specificity

  • Particularly important for antibodies generated against synthetic peptides, like those targeting AA 150-179

• Molecular weight verification:

  • Confirm detection at the expected molecular weight (~94 kDa for full-length ZNF160)

  • Be aware of potential post-translational modifications or splice variants

How do N-terminal vs. C-terminal targeting antibodies differ in ZNF160 detection?

The choice between N-terminal and C-terminal targeting antibodies for ZNF160 has significant experimental implications:

N-terminal targeting antibodies (AA 150-179) :

• Detect the regulatory domain regions of ZNF160

• May recognize potential splice variants that retain the N-terminus

• Examples include ABIN2392489 and ABIN955682, both targeting AA 150-179

• Useful for detecting regulatory interactions that may involve the N-terminal domain

C-terminal targeting antibodies:

• Often target the zinc finger domains themselves

• May provide detection of functional DNA-binding regions

• Could be affected by protein-DNA interactions that might mask epitopes

• Potentially useful for studying ZNF160's transcriptional regulation function

When experimental design permits, using antibodies targeting different regions can provide complementary information about protein structure, processing, and interactions.

What are the optimal conditions for Western blot detection of ZNF160?

For optimal Western blot detection of ZNF160, follow these evidence-based recommendations:

Sample Preparation:

• Cell lysates from SW480, Caco-2, HepG2, or U87-MG provide reliable positive controls

• Use 10-20 μg of total protein per lane for standard detection

• Include protease inhibitors to prevent degradation of the 94 kDa protein

Gel Electrophoresis and Transfer:

• Use 8-10% polyacrylamide gels to properly resolve the 94 kDa protein

• Consider wet transfer methods for efficient transfer of larger proteins

Antibody Conditions:

• Primary antibody: 1:1000 dilution of monoclonal antibody (EPR12523) has been validated

• For polyclonal antibodies (ABIN2392489, ABIN955682), optimization may be required

• Secondary antibody: HRP-conjugated anti-rabbit IgG at manufacturer's recommended dilution

Detection:

• Enhanced chemiluminescence (ECL) provides suitable sensitivity

• Expected band size: 94 kDa for full-length ZNF160

• Allow sufficient exposure time to detect potential lower-abundance splice variants

How should I prepare samples for flow cytometry analysis of ZNF160?

For successful flow cytometric detection of ZNF160, which is primarily an intracellular protein, follow these protocol guidelines:

Cell Preparation:

• U87-MG cells have been validated for flow cytometry detection of ZNF160

• Harvest cells in log phase growth to ensure consistent protein expression

• Use gentle dissociation methods to maintain cellular integrity

Fixation and Permeabilization:

• Fixation: 4% paraformaldehyde for 10-15 minutes at room temperature

• Permeabilization: Critical step for intracellular protein access

  • Use 0.1-0.5% Triton X-100 or commercial permeabilization buffers

  • Saponin-based buffers may preserve epitope recognition better for some antibodies

Antibody Staining:

• Primary antibody: EPR12523 has been validated at 1:10 dilution for flow cytometry

• Include appropriate isotype controls (rabbit IgG) at matching concentrations

• For fluorochrome-conjugated primary antibodies, titrate to determine optimal concentration

Gating Strategy:

• Exclude debris and doublets using FSC/SSC parameters

• Use viability dye to eliminate dead cells that may give false-positive signals

• Compare to isotype control to set positive population thresholds

What is the best immunoprecipitation protocol for ZNF160?

Successful immunoprecipitation of ZNF160 has been demonstrated with the EPR12523 monoclonal antibody . Follow these protocol guidelines:

Lysis Buffer Composition:

• RIPA buffer or NP-40 based buffer (150 mM NaCl, 1% NP-40, 50 mM Tris pH 8.0)

• Include protease inhibitor cocktail to preserve protein integrity

• Consider adding phosphatase inhibitors if studying phosphorylation states

• DNase/RNase may help reduce nucleic acid contamination that can interfere with ZNF160 isolation

Immunoprecipitation Procedure:

• Pre-clear lysate with protein A/G beads to reduce non-specific binding

• Incubate cleared lysate with 2-5 μg EPR12523 antibody per 1 mg protein

• Use protein A-based capture for rabbit antibodies

• Wash stringently (at least 3-5 washes) to remove non-specific interactions

• Elute under denaturing conditions (SDS sample buffer) for subsequent Western blot analysis

Controls:

• Input control: 5-10% of starting material

• IgG control: Matched concentration of non-specific rabbit IgG

• SW480 cell lysate has been validated as a suitable source material

Why might I observe multiple bands in Western blot when using ZNF160 antibodies?

Multiple bands in ZNF160 Western blots can have several legitimate biological or technical explanations:

Biological Factors:

• Alternative splicing: ZNF160 may have multiple isoforms with different molecular weights

• Post-translational modifications: Phosphorylation, ubiquitination, or SUMOylation can shift apparent molecular weight

• Proteolytic processing: Zinc finger proteins may undergo regulated cleavage

Technical Considerations:

• Sample preparation: Inadequate protease inhibition may result in degradation fragments

• Antibody specificity: Some antibodies may cross-react with related zinc finger proteins

• Gel conditions: Insufficient denaturation can lead to aberrant migration patterns

Verification Approaches:

• Compare results with different antibodies targeting distinct epitopes

• Perform siRNA knockdown to confirm which bands are specifically reduced

• Include positive control lysates (e.g., SW480 cells) that show the expected 94 kDa band

• Consider mass spectrometry to identify the proteins in each band

How can I reduce background in flow cytometry experiments with ZNF160 antibodies?

High background in ZNF160 flow cytometry experiments can compromise data quality. Implement these optimization strategies:

Sample Preparation Optimization:

• Ensure complete and consistent permeabilization across samples

• Optimize fixation conditions to preserve epitope structure while allowing antibody access

• Filter cell suspensions before analysis to remove aggregates

Staining Protocol Refinements:

• Increase blocking stringency (5-10% normal serum, 1% BSA) before antibody incubation

• Optimize antibody dilution through careful titration experiments

• Extend washing steps (both duration and number) to remove unbound antibody

• Use Fc block in cells that express Fc receptors

Controls and Validation:

• Always include isotype controls at the same concentration as the primary antibody

• For the EPR12523 antibody, rabbit IgG has been validated as an appropriate control

• Consider fluorescence-minus-one (FMO) controls to set thresholds accurately

• If possible, include a negative control sample (knockdown or cell line without ZNF160)

How can I use ZNF160 antibodies in ChIP experiments to study its DNA binding properties?

As a zinc finger protein, ZNF160 likely functions as a sequence-specific DNA-binding factor. Chromatin immunoprecipitation (ChIP) can elucidate its genomic targets:

Antibody Selection for ChIP:

• For ZNF160 ChIP, select antibodies validated for immunoprecipitation

• The EPR12523 monoclonal antibody has demonstrated IP capability

• Consider ChIP-grade antibodies that have been specifically validated for chromatin applications

Protocol Considerations:

• Crosslinking: Standard 1% formaldehyde for 10 minutes at room temperature

• Sonication: Optimize fragmentation to achieve 200-500 bp chromatin fragments

• Immunoprecipitation: Increase antibody amount (5-10 μg per reaction) compared to standard IP

• Controls: Include IgG control and input samples

• qPCR validation: Design primers for suspected binding regions before pursuing sequencing

Data Analysis Approaches:

• For ChIP-seq analysis, compare ZNF160 binding sites with known transcription factor motifs

• Integrate with RNA-seq data to correlate binding with gene expression changes

• Consider cell type-specific binding patterns using models where ZNF160 is expressed (SW480, U87-MG)

What approaches can I use to study ZNF160 protein-protein interactions?

Understanding ZNF160's protein interaction network is crucial for elucidating its function in transcriptional regulation:

Co-Immunoprecipitation (Co-IP):

• Use the EPR12523 antibody that has validated IP capability

• Preserve protein complexes with gentler lysis conditions (NP-40 rather than RIPA buffer)

• Consider crosslinking approaches to capture transient interactions

• Identify interaction partners through mass spectrometry analysis

Proximity Labeling Approaches:

• BioID or TurboID fusion proteins can identify proteins in close proximity to ZNF160

• APEX2 fusion can provide temporal resolution of interaction partners

• These approaches can identify components of larger transcriptional complexes

Fluorescence Microscopy Techniques:

• Fluorescence Resonance Energy Transfer (FRET) for direct protein-protein interaction studies

• Fluorescence recovery after photobleaching (FRAP) to study dynamics of ZNF160 complexes

• Co-localization studies with other transcription factors or chromatin markers

These methodologies provide complementary information about ZNF160's function within larger transcriptional regulatory complexes.