HIPP16 Antibody

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Description

Overview of HPV16 Neutralizing Antibodies

HPV16 (Human Papillomavirus type 16) is a high-risk oncogenic virus responsible for a significant proportion of cervical cancers worldwide. The development of antibodies against this virus, particularly neutralizing antibodies, forms the structural basis for prophylactic vaccines. These antibodies target specific epitopes on the viral capsid, preventing viral infection by inhibiting attachment to host cells.

The most extensively studied HPV16 neutralizing antibodies include the murine monoclonal antibody H16.V5 and the human monoclonal antibody 26D1. These antibodies represent important tools in understanding immune responses to both HPV16 infection and vaccination .

Epitope Recognition

HPV16 neutralizing antibodies recognize specific epitopes on the L1 virus-like particles (VLPs) of the virus. Research has identified that these epitopes are critical for viral cell attachment and entry. The binding of heparan sulfate to VLPs inhibits the binding of neutralizing antibodies to the antigen, confirming that these epitopes play essential roles in viral infection processes .

Key structural elements involved in antibody binding include:

  • DE loops (particularly DEa)

  • FG loops

  • HI loops (for some antibodies)

Through hybrid VLP binding experiments with surface loop swapping between types, the essential roles of these loops have been demonstrated for antibody recognition and binding .

Critical Binding Residues

Site-directed mutagenesis studies have identified specific amino acid residues critical for antibody binding. For the human neutralizing antibody 26D1, Tyrosine 135 and Valine 141 on the DEa loop are crucial for recognition and binding. These molecular interactions highlight the specificity of the antibody-antigen relationship and explain the neutralizing capacity of these antibodies .

26D1 vs. H16.V5

While both 26D1 and H16.V5 are potent neutralizing antibodies against HPV16, they recognize partially overlapping but distinct epitopes. The table below summarizes the key differences between these two antibodies:

Characteristic26D1H16.V5
OriginHuman (isolated from vaccinee)Murine
Critical loopsDE (especially DEa) and FG loopsFG and HI loops
Critical residuesTyr135, Val141 on DEa loopMultiple residues on FG and HI loops
Binding differencePredominantly in DE loop regionMore dependent on FG and HI regions
Immunological statusRecognizes immunodominant epitopeRecognizes immunodominant epitope

Pairwise epitope mapping has confirmed the partial overlap between the epitopes recognized by 26D1 and H16.V5, with the primary binding difference demonstrated to be in the DE loop region .

Immunodominance

The epitope recognized by the 26D1 antibody has been shown to be immunodominant, meaning it is a major target of the immune response. This epitope is recognized by:

  1. Antibodies elicited by authentic virus from infected individuals

  2. Polyclonal antibodies from vaccinees

This immunodominance suggests that this epitope represents a critical target for protective immunity against HPV16 infection .

Relevance to Vaccination

The identification and characterization of these neutralizing epitopes has significant implications for HPV vaccine development and efficacy. The presence of neutralizing epitopes in HPV L1 virus-like particles forms the structural basis of prophylactic vaccines currently in use worldwide .

Antibody-Dependent Cellular Cytotoxicity

Beyond direct neutralization, antibodies can facilitate viral control through mechanisms such as antibody-dependent cellular cytotoxicity (ADCC). While this mechanism has been more extensively studied in the context of HIV infection, similar principles may apply to HPV control.

The development of antibodies that mediate ADCC is particularly relevant because such antibodies have been associated with protection against various viral infections. For effective ADCC function, antibodies typically require:

  1. High-affinity antigen recognition

  2. Optimization of factors contributing to functional ADCC activity

Studies have shown that gain of antigen binding and ADCC function typically requires mutations in complementarity determining regions of one or both chains. Enhancement of ADCC potency often requires additional mutations in framework regions .

Laboratory Detection Methods

Several laboratory methods are employed to detect and characterize HPV16 antibodies:

  1. Enzyme immunoassays for binding detection

  2. Neutralization assays to assess functional activity

  3. Hybrid VLP binding with surface loop swapping

  4. Site-directed mutagenesis for epitope mapping

  5. Pairwise epitope mapping to compare antibodies

These techniques have been instrumental in defining the epitopes recognized by HPV16 neutralizing antibodies and understanding their functional significance .

Clinical Applications

HPV16 antibodies have significant clinical relevance in multiple contexts:

Vaccine Development and Evaluation

Understanding the epitopes recognized by neutralizing antibodies has directly informed the development of HPV vaccines. Current HPV vaccines generate robust antibody responses to these key epitopes, providing protection against infection and subsequent cancer development.

Immune Monitoring

Detection of HPV16 antibodies can serve as markers of:

  • Prior infection

  • Vaccination response

  • Potentially, risk of disease progression

Product Specs

Buffer
Preservative: 0.03% Proclin 300
Constituents: 50% Glycerol, 0.01M Phosphate Buffered Saline (PBS), pH 7.4
Form
Liquid
Lead Time
Made-to-order (14-16 weeks)
Synonyms
HIPP16 antibody; FP4 antibody; At3g07600 antibody; MLP3.5Heavy metal-associated isoprenylated plant protein 16 antibody; AtHIP16 antibody; Farnesylated protein 4 antibody; AtFP4 antibody
Target Names
HIPP16
Uniprot No.

Target Background

Function
HIPP16 Antibody targets a protein that is likely involved in heavy metal binding.
Database Links

KEGG: ath:AT3G07600

STRING: 3702.AT3G07600.1

UniGene: At.18333

Protein Families
HIPP family

Q&A

What is the origin and classification of HIPP16 Antibody?

HIPP16 Antibody belongs to the immunoglobulin family, with specific germline lineage characteristics that determine its binding properties. Like other well-characterized antibodies, its functional properties are influenced by its variable region sequences, particularly within the complementarity-determining regions (CDRs). The antibody's classification should be analyzed through sequence analysis to determine whether it derives from distinct germline lineages, which would indicate a polyclonal response, or if it demonstrates a common variable heavy chain pattern .

When characterizing a novel antibody like HIPP16, researchers should examine:

Analysis ParameterPurposeCommon Methodology
Heavy Chain LineageDetermine antibody familyNGS sequencing of variable region
Light Chain TypeIdentify if kappa or lambdaSequence analysis
CDR-H3 LengthCorrelate with binding specificitySequence analysis (typical range: 16-23 amino acids)
Somatic Mutation LevelAssess maturation levelCompare to germline sequences (typically 94-98% identity)

How should I validate the specificity of HIPP16 Antibody in experimental systems?

Validation of HIPP16 Antibody specificity requires a multi-faceted approach to ensure reliable experimental outcomes. Begin with basic binding assays (ELISA, Western blot) against purified target antigen, followed by more complex validation in cellular contexts.

For robust specificity validation, researchers should implement:

  • Cross-reactivity testing against structurally similar antigens

  • Competitive binding assays with known ligands

  • Assessment across multiple experimental platforms (in vitro and in vivo)

  • Knockout/knockdown controls to confirm target specificity

When analyzing antibody-antigen interactions, examine epitope specificity, antibody association rate, and potential intra-antigen antibody interactions, as these factors are key determinants of functional potency . Computational approaches combining biophysics-informed modeling with selection experiments can help predict binding specificity even for closely related ligands .

What factors determine HIPP16 Antibody's functional activity in experimental systems?

The functional activity of HIPP16 Antibody will be governed by several molecular characteristics. Research has shown that for antibodies generally, three key determinants significantly influence functional potency:

  • Epitope specificity: The precise region of the antigen targeted by the antibody

  • Antibody association rate: How quickly the antibody binds to its target

  • Intra-antigen antibody interactions: How antibody binding affects antigen conformation

A comprehensive assessment should examine these parameters through:

ParameterMeasurement TechniqueSignificance
Epitope MappingHDX-MS, X-ray crystallography, or Cryo-EMIdentifies binding region and potential overlap with functional domains
Association Rate (kon)Surface Plasmon Resonance (SPR)Faster association correlates with improved functional activity
Affinity (KD)ELISA, SPRStronger binding generally improves activity (though not always)
Functional AssaysCell-based or biochemical assaysDirect measurement of biological effect

How can I determine the epitope landscape recognized by HIPP16 Antibody?

Detailed epitope mapping of HIPP16 Antibody goes beyond basic binding studies to understand the precise molecular interactions. Advanced structural biology approaches combined with computational modeling provide comprehensive insights.

To characterize the epitope landscape:

  • Implement high-resolution structural analysis using X-ray crystallography or Cryo-EM of the antibody-antigen complex

  • Identify key interacting residues through alanine scanning mutagenesis

  • Determine the buried surface area of critical residues, as some positions may contribute disproportionately to binding energy

  • Assess paratope composition to determine which CDRs contribute most to the binding interface (often CDR-H2, -H3, and -L3 comprise approximately 80% of the interface)

This detailed molecular understanding allows prediction of cross-reactivity to related antigens and informs rational design of improved variants. For instance, in the SARS-CoV-2 studies, researchers identified that certain RBD positions (G485, F486, and N487) buried all available surface area into one antibody, forming almost half of the epitope .

What computational approaches can predict and design improved HIPP16 Antibody variants with customized specificity profiles?

Advanced computational modeling can significantly enhance HIPP16 Antibody engineering beyond what traditional experimental methods alone can achieve. Biophysics-informed models trained on experimental selection data can disentangle distinct binding modes associated with different ligands .

For designing antibodies with customized specificity:

  • Implement high-throughput sequencing of experimentally selected antibody variants

  • Develop a computational model associating each potential ligand with a distinct binding mode

  • For creating highly specific variants: minimize energy functions for desired targets while maximizing for undesired targets

  • For cross-specific variants: jointly minimize energy functions for all desired targets

This approach has been validated in phage display experiments where computational design successfully generated antibodies not present in the initial library that demonstrated predicted specificity profiles . The methodology allows researchers to:

Design GoalComputational StrategyValidation Approach
Enhanced SpecificityMaximize energy gap between target and non-target bindingBinding assays against target and structurally similar non-targets
Cross-reactivityMinimize energy for multiple targets simultaneouslyPanel testing across target variants
Reduced Off-target EffectsCounter-selection algorithms to eliminate unwanted bindingNegative selection screens

How can we leverage HIPP16 Antibody sequence-structure relationships to predict and engineer enhanced binding properties?

Understanding the sequence-structure relationships of HIPP16 Antibody enables rational engineering approaches. Analysis of somatic hypermutation patterns and CDR configurations provides a foundation for directed evolution strategies.

Key engineering considerations include:

  • Examine the level of somatic hypermutation in variable genes (typically ranging from 94.5% to 98.25% identity to germline for naturally occurring antibodies)

  • Analyze the H-CDR3 length, which can range from 16 to 23 amino acids, and correlate with binding modes

  • Identify whether HIPP16 derives from antibody families known to produce broadly reactive antibodies (like IGHV3-53 for SARS-CoV-2)

  • Utilize computational models that can predict the outcome of sequence modifications beyond the scope of experimentally observed variants

Research has demonstrated that combining high-throughput sequencing data with machine learning approaches allows predictions beyond experimentally observed sequences, offering powerful toolsets for designing antibodies with desired binding properties .

What is the optimal phage display protocol for selecting HIPP16 Antibody variants with enhanced target specificity?

Phage display represents a powerful technique for selecting HIPP16 Antibody variants with desired properties. The protocol should be carefully designed to isolate variants with enhanced specificity while minimizing selection of non-specific binders.

An optimized protocol includes:

  • Pre-selection steps to deplete the library of non-specific binders (e.g., incubation with naked beads or irrelevant targets)

  • Multiple rounds of selection with amplification between rounds to enrich for specific binders

  • Systematic collection of phages at each step to monitor library composition throughout the selection process

  • Parallel selections against various combinations of targets and non-targets to identify truly specific binders

When implementing this approach:

Selection StagePurposeAnalytical Method
Pre-selectionDeplete non-specific bindersNGS of depleted library
Positive SelectionEnrich target-specific bindersNGS of enriched population
Counter-selectionRemove cross-reactive clonesNGS to confirm depletion
Final EnrichmentAmplify highest affinity clonesIndividual clone analysis

The advantage of this approach is that it generates comprehensive datasets that can train computational models to predict binding modes even for ligands not directly included in the selection .

How should I design experiments to evaluate HIPP16 Antibody combinations for synergistic effects?

Evaluating combinations of HIPP16 Antibody with other antibodies requires systematic assessment of binding complementarity and functional synergy. The experimental design should test various antibody pairings targeting non-overlapping epitopes.

For comprehensive synergy assessment:

  • Perform epitope binning to identify antibodies targeting distinct epitopes

  • Create a matrix of antibody combinations at various concentrations

  • Evaluate binding enhancement through techniques like biolayer interferometry

  • Assess functional synergy in relevant biological assays

  • Consider in vivo studies at varying doses to determine minimum effective combination doses

Structural studies can confirm non-overlapping epitopes, with separation distances (e.g., approximately 4 Å) on the same antigen . When analyzing results, look for combinations that provide significant protection even at low doses (e.g., as low as 0.156 mg/kg body weight in animal models), which would indicate strong synergistic effects .

What are the best methods for structural characterization of HIPP16 Antibody-antigen complexes?

Comprehensive structural characterization of HIPP16 Antibody-antigen complexes requires multiple complementary techniques that reveal different aspects of the interaction interface.

For optimal structural characterization:

  • X-ray crystallography: Provides atomic-level resolution of the complex, revealing precise molecular interactions

  • Cryo-electron microscopy (Cryo-EM): Useful for larger complexes or when crystallization is challenging

  • Hydrogen-deuterium exchange mass spectrometry (HDX-MS): Maps binding interfaces through differential solvent accessibility

  • Computational modeling: Predicts interaction dynamics beyond static structures

Analysis should focus on:

Structural FeatureRelevanceAnalysis Method
Paratope CompositionIdentifies key binding residuesMap % contribution from each CDR
Epitope FootprintDefines target recognition siteCalculate buried surface area
Key InteractionsHydrogen bonds, salt bridges, etc.Measure interaction distances
Binding ModeHow the antibody approaches its targetCompare to known antibody classes

This structural information is critical for understanding mechanisms of action and engineering improved variants, as demonstrated in studies where researchers identified that paratopes can be predominantly composed of residues from specific CDRs (CDR-H2, -H3, and -L3) comprising up to 80% of the interface .

How can I address inconsistent binding results with HIPP16 Antibody across different experimental platforms?

Inconsistent binding results across platforms often stem from differences in antigen presentation, buffer conditions, or detection methods. Systematic troubleshooting is essential for resolving these discrepancies.

When addressing inconsistent results:

  • Standardize antigen preparation and quality across all platforms

  • Implement parallel positive and negative controls on each platform

  • Test multiple antibody concentrations to ensure you're within the linear detection range

  • Consider whether the epitope may be conformationally sensitive and affected by platform-specific conditions

Creating a standardized validation pipeline with multiple orthogonal methods can help distinguish real biological differences from technical artifacts . Biophysics-informed models can also help identify and mitigate experimental artifacts and biases in selection experiments .

What statistical approaches should I use when analyzing HIPP16 Antibody binding and functional data?

Robust statistical analysis of HIPP16 Antibody data requires appropriate methods based on experimental design and data distribution.

For comprehensive data analysis:

  • Use replicate experiments (minimum n=3) for all quantitative measurements

  • Apply appropriate normalization to account for day-to-day variations

  • Implement statistical tests appropriate for your experimental design:

    • Paired t-tests for before/after comparisons

    • ANOVA for multi-group comparisons

    • Non-parametric tests when normal distribution cannot be assumed

When analyzing dose-response data:

Analysis ParameterCalculation MethodInterpretation Guidelines
IC50/EC50 ValuesFour-parameter logistic regressionCompare values across variants and conditions
Maximal ResponseAsymptote of dose-response curveIndicates efficacy (vs. potency)
Statistical Significancep-values with multiple testing correctionTypically p<0.05 considered significant
Correlation AnalysisPearson/Spearman correlationAssesses relationship between parameters

Careful statistical analysis should reveal strong correlations between binding parameters and functional outcomes, such as the correlation between minimal weight loss and undetectable viral load observed in antibody protection studies .

How can I determine if observed HIPP16 Antibody polyreactivity is biologically significant versus an experimental artifact?

Distinguishing true polyreactivity from artifacts requires systematic analysis using multiple approaches. Polyreactivity assessment is crucial as it may impact both experimental interpretations and potential applications.

For rigorous polyreactivity assessment:

  • Implement ELISA-based polyreactivity assays with diverse antigens (e.g., solubilized membrane proteins)

  • Compare binding patterns to known polyreactive and monospecific control antibodies

  • Assess binding to relevant versus irrelevant tissues using immunohistochemistry

  • Consider bead-based multiplex binding assays for high-throughput screening

  • Evaluate functional consequences of apparent cross-reactivity

A systematic approach will help determine whether polyreactivity represents:

  • True cross-reactivity to structurally similar epitopes

  • Non-specific binding due to physicochemical properties of the antibody

  • Technical artifacts related to experimental conditions

Before concluding on polyreactivity, ensure antibody quality through SEC analysis to rule out aggregation-based artifacts, and confirm findings across multiple independent experimental approaches.

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