Document Detail


Enhanced protein thermostability from site-directed mutations that decrease the entropy of unfolding.
MedLine Citation:
PMID:  3477797     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
It is proposed that the stability of a protein can be increased by selected amino acid substitutions that decrease the configurational entropy of unfolding. Two such substitutions, one of the form Xaa----Pro and the other of the form Gly----Xaa, were constructed in bacteriophage T4 lysozyme at sites consistent with the known three-dimensional structure. Both substitutions stabilize the protein toward reversible and irreversible thermal denaturation at physiological pH. The substitutions have no effect on enzymatic activity. High-resolution crystallographic analysis of the proline-containing mutant protein (Ala-82----Pro) shows that its three-dimensional structure is essentially identical with the wild-type enzyme. The overall structure of the other mutant enzyme (Gly-77----Ala) is also very similar to wild-type lysozyme, although there are localized conformational adjustments in the vicinity of the altered amino acid. The combination of a number of such amino acid replacements, each of which is expected to contribute approximately 1 kcal/mol (1 cal = 4.184 J) to the free energy of folding, may provide a general strategy for substantial improvement in the stability of a protein.
Authors:
B W Matthews; H Nicholson; W J Becktel
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Proceedings of the National Academy of Sciences of the United States of America     Volume:  84     ISSN:  0027-8424     ISO Abbreviation:  Proc. Natl. Acad. Sci. U.S.A.     Publication Date:  1987 Oct 
Date Detail:
Created Date:  1987-11-04     Completed Date:  1987-11-04     Revised Date:  2009-11-18    
Medline Journal Info:
Nlm Unique ID:  7505876     Medline TA:  Proc Natl Acad Sci U S A     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  6663-7     Citation Subset:  IM    
Affiliation:
Institute of Molecular Biology, University of Oregon, Eugene 97403.
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MeSH Terms
Descriptor/Qualifier:
Calorimetry
Drug Stability
Muramidase / genetics*
Mutation*
Protein Conformation*
Proteins / genetics*
T-Phages / enzymology,  genetics
Thermodynamics
Grant Support
ID/Acronym/Agency:
GM20066/GM/NIGMS NIH HHS; GM20195/GM/NIGMS NIH HHS; GM21967/GM/NIGMS NIH HHS
Chemical
Reg. No./Substance:
0/Proteins; EC 3.2.1.17/Muramidase
Comments/Corrections

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