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Tertiary motifs as building blocks for the design of protein‐binding peptides.

Authors :
Swanson, Sebastian
Sivaraman, Venkatesh
Grigoryan, Gevorg
Keating, Amy E.
Source :
Protein Science: A Publication of the Protein Society; Jun2022, Vol. 31 Issue 6, p1-18, 18p
Publication Year :
2022

Abstract

Despite advances in protein engineering, the de novo design of small proteins or peptides that bind to a desired target remains a difficult task. Most computational methods search for binder structures in a library of candidate scaffolds, which can lead to designs with poor target complementarity and low success rates. Instead of choosing from pre‐defined scaffolds, we propose that custom peptide structures can be constructed to complement a target surface. Our method mines tertiary motifs (TERMs) from known structures to identify surface‐complementing fragments or "seeds." We combine seeds that satisfy geometric overlap criteria to generate peptide backbones and score the backbones to identify the most likely binding structures. We found that TERM‐based seeds can describe known binding structures with high resolution: the vast majority of peptide binders from 486 peptide‐protein complexes can be covered by seeds generated from single‐chain structures. Furthermore, we demonstrate that known peptide structures can be reconstructed with high accuracy from peptide‐covering seeds. As a proof of concept, we used our method to design 100 peptide binders of TRAF6, seven of which were predicted by Rosetta to form higher‐quality interfaces than a native binder. The designed peptides interact with distinct sites on TRAF6, including the native peptide‐binding site. These results demonstrate that known peptide‐binding structures can be constructed from TERMs in single‐chain structures and suggest that TERM information can be applied to efficiently design novel target‐complementing binders. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
09618368
Volume :
31
Issue :
6
Database :
Complementary Index
Journal :
Protein Science: A Publication of the Protein Society
Publication Type :
Academic Journal
Accession number :
157152113
Full Text :
https://doi.org/10.1002/pro.4322