Protein tolerance to random circular permutation correlates with thermostability and local energetics of residue-residue contacts.

ABSTRACT: Adenylate kinase (AK) orthologs with a range of thermostabilities were subjected to random circular permutation, and deep mutational scanning was used to evaluate where new protein termini were nondisruptive to activity. The fraction of circularly permuted variants that retained function in each library correlated with AK thermostability. In addition, analysis of the positional tolerance to new termini, which increase local conformational flexibility, showed that bonds were either functionally sensitive to cleavage across all homologs, differentially sensitive, or uniformly tolerant. The mobile AMP-binding domain, which displays the highest calculated contact energies, presented the greatest tolerance to new termini across all AKs. In contrast, retention of function in the lid and core dom

SUBMITTER: Atkinson JT 

PROVIDER: S-EPMC7462040 | biostudies-literature | 2019 Dec

REPOSITORIES: biostudies-literature