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Structural Bioinformatics Section Vaccine Research Center/NIAID/NIH

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1 Structural Bioinformatics Section Vaccine Research Center/NIAID/NIH
Application of Neutralization Fingerprinting in Antibody Epitope Prediction and Delineating Antibody Recognition in HIV-1 Sera Gwo-Yu Chuang Structural Bioinformatics Section Vaccine Research Center/NIAID/NIH September 25th, 2014

2 Who We Are SBIS Ivelin Georgiev Peter Kwong Computational Biology and
Structural Bioinformatics Vaccine Design Structure Analysis Serum Analysis/ Antibodyomics Immunogen Ivelin Georgiev Peter Kwong

3 Major Epitopes Targeted by Broadly Neutralizing Antibodies On the HIV-1 Env Spike
MPER-like Pancera et al. (2012) Nature (in press)

4 A fast and accurate method to delineate HIV-1 sera specificity
Goals A fast and accurate method to predict HIV-1 antibody epitope in residue level Understand resistance mutation Facilitate optimization of neutralizing antibodies Provide basis for epitope-based vaccine design A fast and accurate method to delineate HIV-1 sera specificity Isolation of new monoclonal antibodies that may be of therapeutic value Elucidating immunodominant epitopes

5 Predicting HIV-1 sera specificity using neutralization fingerprinting
Outline Predicting antibody epitope in residue level using neutralization fingerprint Predicting HIV-1 sera specificity using neutralization fingerprinting

6 Existing Methods for Epitope Prediction
Experimental: Method Accuracy Efficiency Crystallography High Low NMR Cryo-EM Medium Alanine Scanning Medium/High Medium/Low Pepscan Computational: Method Accuracy Efficiency Protein Docking Low High Sequence and structure analysis

7 Covariation Between Neutralization Potency and Sequence Variability
Basis: Altering amino acid of epitope residues is highly likely to affect neutralization Amino acid fingerprints Neutralization fingerprint 1 x y n …… …… Strain 1 …… …… Strain 2 …… …… Strain 3 …… …… Strain 4 …… …… Strain 5 …… …… Strain 6 Different amino acid types Different neutralization potency levels Chuang et al (2013), Journal of Virology

8 Covariation Between Neutralization Potency and Sequence Variability
Basis: Altering amino acid of epitope residues is highly likely to affect neutralization Amino acid type at position x Neutralization potency Amino acid type at position y Neutralization potency Amino acid type at position x and neutralization potency have a high degree of mutual variation => Position x is likely at the epitope Amino acid type at position y and neutralization potency have a low degree of mutual variation => Position y is not likely at the epitope Different amino acid types Different neutralization potency levels Chuang et al (2013), Journal of Virology

9 Epitope Prediction Based on Mutual Information Between Neutralization and Sequence Variability
Rank each antigen residue by the normalized mutual information between amino acid type and neutralization IC50 Mutual information calculation Amino acid type at position i Neutralization potency x: amino acid types y: neutralization IC50 values (20 aa type plus gap) discretized as neutralizing (IC50<50μg/mL) and non-neutralizing (IC50>=50μg/mL) Chuang et al (2013), Journal of Virology

10 Incorporating Antigen Structural Information and Epitope Propensity Score
Mutual information calculation Amino acid type at position i Neutralization potency + Surface Accessibility Spatial Localization of high scoring residues Epitope propensity score (PS) (Haste-Andersen et al Protein Sci.) Chuang et al (2013), Journal of Virology

11 Test Cases – 19 HIV-1 antibodies
Neutralization panel (181 strains) Antibodies Viral Strains Antibody Site of Recognition VRC01 CD4-binding site VRC-PG04 b12 b13 F105 NIH45-46 3BNC117 VRC-PG20 VRC23 CH103 VRC03 VRC06 VRC-CH31 17b CD4i 10E8 MPER 2F5 4E10 PG9 V1/V2 PG16 Epitope defined by crystal structure Antibody(Fab) Antigen Antigen-antibody complex crystal structure Chuang et al (2013), Journal of Virology Likelihood of being an epitope residue: i > i+1 > i+2 >i+3

12 Neutralization-based Epitope Prediction Algorithms Give Good Prediction Accuracy
TP (True Positive): Number of correctly predicted epitope residues FP (False Positive): Number of incorrectly predicted epitope residues TP rate= TP/(Number of epitope residues) FP rate= FP/(Number of non-epitope residues) Chuang et al (2013), Journal of Virology Likelihood of being an epitope residue: i > i+1 > i+2 >i+3

13 Case Study: Predicting the Epitope of HIV-1 Antibody 8ANC195
Isolated using a stabilized HIV-1 gp120 core (2CC) (Scheid et al. 2011, Science) Does not possess characteristics of CD4bs- or CD4i-antibodies No 8ANC195/gp120 complex structure available at the time of prediction

14 8ANC195 Epitope Prediction
Top 10 predicted epitope residues HIV-1 gp120 Top 10 predicted epitope residues Glycan 276 Glycan 234 N/C termini CD4 binding site - Three of the top ten predicted residues are part of two N-linked glycosylation sequons at gp120 residues 234 and 276, suggesting that 8ANC195 might binds to these two glycans Chuang et al (2013), Journal of Virologyç

15 8ANC195 Binding/Neutralization is Affected by the Presence of N-linked Glycans at Residue 234 and 276 8ANC195 neutralization of V2.C6 pseudoviruses 8ANC195 binding to gp120 mutants Mutations Neutralization IC50 (μg/mL) Wild type 0.049 N234S >50 T236K N276D Chuang et al (2013), Journal of Virology

16 (Scharf et al (2014), Cell Reports)
Predicted 8ANC195 Epitope Residues Highly Agree with Epitope Determined by Crystallography N/C termini HIV-1 gp120 8ANC195 epitope determined by crystal structure Glycan 234 Glycan 234 Top 10 predicted epitope residues Glycan 276 Glycan 276 PDB:4P9H (Scharf et al (2014), Cell Reports) 5 of the top 10 predicted residues are part of the 8ANC195 epitope Chuang et al (2013), Journal of Virology

17 NEP: Neutralization-based Epitope Prediction Web-Server
Input: 1) Antibody neutralization data 2) Antigen sequence 3) Antigen structure (optional) Chuang et al (2014), Nucleic Acids Research

18 Conclusions (I) The neutralization-based algorithm is able to predict the epitope residues of HIV-1 antibodies with good accuracy and high efficiency HIV-1 antibody 8ANC195 binds to N-linked glycans at gp120 position 234 and This binding mode was not described at the time of the prediction A web-based server (NEP) is available to the public to run neutralization-based epitope prediction The method is applicable to other viruses with diverse strains (e.g. influenza)

19 Predicting HIV-1 sera specificity using neutralization fingerprinting
Outline Predicting antibody epitope in residue level using neutralization fingerprint Predicting HIV-1 sera specificity using neutralization fingerprinting

20 Mapping HIV-1 Sera Specificity
Peptide Interference Linear epitopes Epitope Specific Probes e.g. gp120 core Knocking out specific sites e.g N160K to knockout V1/V2 ab binding Chimeric Viruses e.g. grafting HIV-1 epitopes on SIV Binley et al. (2009) Current Opinion in HIV and AIDS . Dey et al. (2009) Plos Pathogens

21 Identification of Serum Specificity by Deconvolution of Neutralization Fingerprints
10E8-like PG9-like Viruses Viruses VRC01 PG9 10E8 PGT128 Georgiev et al (2013), Science

22 Predicted Sera Specificities Agree with Identified Neutralizing Antibodies
V1/V2 specific antibody VRC26 was identified (Doria-Rose (2014), Nature) Georgiev et al (2013), Science

23 Predicted Sera Specificities Matched Standard Sera Mapping
Georgiev et al (2013), Science

24 Conclusions (II) A new computational tool, based on neutralization fingerprints, was developed to predict HIV-1 sera specificities The tool can aid the identification of new anti-HIV-1 broadly neutralizing antibody and understanding of the development of broadly neutralizing antibodies during the course of infection

25 Acknowledgments Structural Bioinformatics Section Peter Kwong
Ivelin Georgiev BSL3 Core Virology Section John Mascola Nicole Doria-Rose Ryan Staupe Mark K. Louder Stephen Schmidt Krisha McKee Sijy O’Dell Structural Biology Section Peter Kwong Priyamvada Acharya Jason Gorman Young Do Kwon Marie Pancera Yongping Yang Baoshan Zhang Tongqing Zhou Immunology Core Section Robert Bailer Office of Cyber Infrastructure and Computational Biology David Liou

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