Cited by 142Protein Structure and DynamicsComputational Drug Discovery MethodsEnzyme Structure and Function

BindProfX: Assessing Mutation-Induced Binding Affinity Change by Protein Interface Profiles with Pseudo-Counts

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Xiong, Peng, Zhang, Chengxin, Zheng, Wei, Zhang, Yang·2017·Journal of Molecular Biology

Abstract

Understanding how gene-level mutations affect the binding affinity of protein-protein interactions is a key issue of protein engineering. Due to the complexity of the problem, using physical force field to predict the mutation-induced binding free-energy change remains challenging. In this work, we present a renewed approach to calculate the impact of gene mutations on the binding affinity through the structure-based profiling of protein-protein interfaces, where the binding free-energy change (ΔΔG) is counted as the logarithm of relative probability of mutant amino acids over wild-type ones in the interface alignment matrix; three pseudo-counts are introduced to alleviate the limit of the current interface library. Compared with a previous profile score that was based on the log-odds likelihood calculation, the correlation between predicted and experimental ΔΔG of single-site mutations is increased in this approach from 0.33 to 0.68. The structure-based profile score is found complementary to the physical potentials, where a linear combination of the profile score with the FoldX potential could increase the ΔΔG correlation from 0.46 to 0.74. It is also shown that the profile score is robust for counting the coupling effect of multiple individual mutations. For the mutations involving more than two mutation sites where the correlation between FoldX and experimental data vanishes, the profile-based calculation retains a strong correlation with the experimental measurements.

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Authors
Xiong, P., Zhang, C., Zheng, W., & Zhang, Y.
Affiliations
University of Michigan (US)
Corresponding author
Zhang, Yang
Venue
Journal of Molecular Biology
Publisher
Elsevier BV
Published
2017-02
Volume
429
Issue
3
Pages
426-434
ISSN
0022-2836 (ISSN-L)
OpenAlex
W2554576124
Cited by
140
References
26
Citations by year
2026: 8 · 2025: 17 · 2024: 20 · 2023: 20 · 2022: 18 · 2021: 12 · 2020: 15 · 2019: 15 · 2018: 8 · 2017: 6 · 2016: 1
FWCI
5.37
Type
journal article
Language
en
Open access
Locations
  • Journal of Molecular Biology (acceptedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Institute of General Medical Sciences (GM083107, GM116960)
  • National Science Foundation (DBI1564756)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Structure and Dynamics
  • Physical Sciences › Computer Science › Computational Theory and Mathematics › Computational Drug Discovery Methods
  • Physical Sciences › Materials Science › Materials Chemistry › Enzyme Structure and Function
Keywords
protein-protein interaction, pseudo counts, point mutations, protein engineering
MeSH terms
Algorithms, Amino Acid Sequence, Models, Molecular, Mutation, Protein Conformation, Proteins, Protein Engineering, Computational Biology, Protein Interaction Maps

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