Exploring the binding of rationally engineered tandem-repeat proteins to E3 ubiquitin ligase Keap1

Author:

Madden Sarah K1,Itzhaki Laura S1ORCID

Affiliation:

1. Department of Pharmacology, University of Cambridge, Cambridge CB2 1PD, UK

Abstract

Abstract The process of displaying functional peptides by ‘grafting’ them onto loops of a stable protein scaffold can be used to impart binding affinity for a target, but it can be difficult to predict the affinity of the grafted peptide and the effect of grafting on scaffold stability. In this study, we show that a series of peptides that bind to the E3 ubiquitin ligase Keap1 can be grafted into the inter-repeat loop of a consensus-designed tetratricopeptide repeat (CTPR) protein resulting in proteins with high stability. We found that these CTPR-grafted peptides had similar affinities to their free peptide counterparts and achieved a low nanomolar range. This result is likely due to a good structural match between the inter-repeat loop of the CTPR and the Keap1-binding peptide. The grafting process led to the discovery of a new Keap1-binding peptide, Ac-LDPETGELL-NH2, with low nanomolar affinity for Keap1, highlighting the potential of the repeat-protein class for application in peptide display.

Funder

BBSRC Doctoral Training Scholarship

CRUK Biotherapeutic Drug Discovery Project Award

CRUK Pioneer Award

Publisher

Oxford University Press (OUP)

Subject

Molecular Biology,Biochemistry,Bioengineering,Biotechnology

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