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PMID: 8378312 Published · ppublish English Journal Article Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. Research Support, U.S. Gov't, P.H.S.

What determines the strength of noncovalent association of ligands to proteins in aqueous solution?

Miyamoto S, Kollman PA

Abstract

Free energy perturbation methods using molecular dynamics have been used to calculate the absolute free energy of association of two ligand-protein complexes. The calculations reproduce the significantly more negative free energy of association of biotin to streptavidin, compared to N-L-acetyltryptophanamide/alpha-chymotrypsin. This difference in free energy of association is due to van der Waals/dispersion effects in the nearly ideally performed cavity that streptavidin presents to biotin, which involves four tryptophan residues.

MeSH Terms
Bacterial Proteins/metabolism Biotin/metabolism Calorimetry Chymotrypsin/metabolism Ligands Models, Molecular Protein Binding Protein Conformation Proteins/chemistry,metabolism Streptavidin Tryptophan/analogs & derivatives,metabolism
Chemicals
Bacterial Proteins Ligands Proteins N-acetyltryptophanamide Biotin Tryptophan Streptavidin Chymotrypsin
Authors & Affiliations
2 authors, click to expand affiliations / ORCID
Miyamoto S
Department of Pharmaceutical Chemistry, University of California, San Francisco 94143.
Kollman P A
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Article Info
Journal
Proceedings of the National Academy of Sciences of the United States of America
Abbr.
Proc Natl Acad Sci U S A
ISSN
0027-8424
Published
1993-09-15
Pages
8402-6
Language
English
Region
United States
NLM ID
7505876
PMCID
PMC47364
Subset
IM
Grants
NIGMS NIH HHS · GM-29072 · United States
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