TY - JOUR
T1 - Protein tolerance to random circular permutation correlates with thermostability and local energetics of residue-residue contacts
AU - Atkinson, Joshua T.
AU - Jones, Alicia M.
AU - Nanda, Vikas
AU - Silberg, Jonathan J.
N1 - Publisher Copyright:
© The Author(s) 2020. Published by Oxford University Press. All rights reserved. For permissions, please e-mail: [email protected].
PY - 2019/12/31
Y1 - 2019/12/31
N2 - 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.
AB - 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.
KW - combinatorial library
KW - deep mutational scanning
KW - mutational tolerance
KW - topological mutation
KW - transposon mutagenesis
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U2 - 10.1093/protein/gzaa012
DO - 10.1093/protein/gzaa012
M3 - Article
C2 - 32626892
AN - SCOPUS:85089129378
SN - 1741-0126
VL - 32
SP - 489
EP - 501
JO - Protein Engineering, Design and Selection
JF - Protein Engineering, Design and Selection
IS - 11
ER -