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

Joshua T. Atkinson, Alicia M. Jones, Vikas Nanda, Jonathan J. Silberg

Research output: Contribution to journalArticlepeer-review

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 domains was more dependent upon AK melting temperature. These results show that family permutation profiling identifies primary structure that has been selected by evolution for dynamics that are critical to activity within an enzyme family. These findings also illustrate how deep mutational scanning can be applied to protein homologs in parallel to differentiate how topology, stability, and local energetics govern mutational tolerance.

Original languageEnglish (US)
Pages (from-to)489-501
Number of pages13
JournalProtein Engineering, Design and Selection
Volume32
Issue number11
DOIs
StatePublished - Dec 31 2019

All Science Journal Classification (ASJC) codes

  • Biotechnology
  • Bioengineering
  • Biochemistry
  • Molecular Biology

Keywords

  • combinatorial library
  • deep mutational scanning
  • mutational tolerance
  • topological mutation
  • transposon mutagenesis

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