Ultra-large Chemical Libraries for the Discovery of High-affinity Peptide Binders

Overview

Journal Nat Commun

Specialty Biology

Date 2020 Jun 25

PMID 32576815

Citations 45

Authors

Anthony J Quartararo

Zachary P Gates

Bente A Somsen

Nina Hartrampf

Xiyun Ye

Arisa Shimada

Yasuhiro Kajihara

Christian Ottmann

Bradley L Pentelute

Affiliations

Soon will be listed here.

Abstract

High-diversity genetically-encoded combinatorial libraries (10-10 members) are a rich source of peptide-based binding molecules, identified by affinity selection. Synthetic libraries can access broader chemical space, but typically examine only ~ 10 compounds by screening. Here we show that in-solution affinity selection can be interfaced with nano-liquid chromatography-tandem mass spectrometry peptide sequencing to identify binders from fully randomized synthetic libraries of 10 members-a 100-fold gain in diversity over standard practice. To validate this approach, we show that binders to a monoclonal antibody are identified in proportion to library diversity, as diversity is increased from 10-10. These results are then applied to the discovery of p53-like binders to MDM2, and to a family of 3-19 nM-affinity, α/β-peptide-based binders to 14-3-3. An X-ray structure of one of these binders in complex with 14-3-3σ is determined, illustrating the role of β-amino acids in facilitating a key binding contact.

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