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Native protein sequences are close to optimal for their structures

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Kuhlman, Brian, Baker, David·2000·Proceedings of the National Academy of Sciences

Abstract

How large is the volume of sequence space that is compatible with a given protein structure? Starting from random sequences, low free energy sequences were generated for 108 protein backbone structures by using a Monte Carlo optimization procedure and a free energy function based primarily on Lennard–Jones packing interactions and the Lazaridis–Karplus implicit solvation model. Remarkably, in the designed sequences 51% of the core residues and 27% of all residues were identical to the amino acids in the corresponding positions in the native sequences. The lowest free energy sequences obtained for ensembles of native-like backbone structures were also similar to the native sequence. Furthermore, both the individual residue frequencies and the covariances between pairs of positions observed in the very large SH3 domain family were recapitulated in core sequences designed for SH3 domain structures. Taken together, these results suggest that the volume of sequence space optimal for a protein structure is surprisingly restricted to a region around the native sequence.

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Authors
Kuhlman, B., & Baker, D.
Venue
Proceedings of the National Academy of Sciences
Published
2000-09-12
Volume
97
Issue
19
Pages
10383-10388
ISSN
  • 0027-8424 (ISSN-L)
  • 1091-6490
OpenAlex
W2135815512
Cited by
810
References
0
FWCI
5.75
Type
journal article
Language
en
Open access
green

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