title: Membrane proteins can have high kinetic stability.
abstract: Approximately 10% of water-soluble proteins are considered kinetically stable with unfolding half-lives in the range of weeks to millenia. These proteins only rarely sample the unfolded state and may never unfold on their respective biological time scales. It is still not known whether membrane proteins can be kinetically stable, however. Here we examine the subunit dissociation rate of the trimeric membrane enzyme, diacylglycerol kinase, from Escherichia coli as a proxy for complete unfolding. We find that dissociation occurs with a half-life of at least several weeks, demonstrating that membrane proteins can remain locked in a folded state for long periods of time. These results reveal that evolution can use kinetic stability to regulate the biological function of membrane proteins, as it can for soluble proteins. Moreover, it appears that the generation of kinetic stability could be a viable target for membrane protein engineering efforts.
authors.affiliation: Department of Chemistry and Biochemistry, University of California, Los Angeles-Department of Energy Institute for Genomics and Proteomics, Molecular Biology Institute, University of California, Los Angeles , Los Angeles, California 90095, United States.
authors.forename: Robert E
authors.initials: RE
authors.lastname: Jefferson
authors.forename: Tracy M
authors.initials: TM
authors.lastname: Blois
authors.forename: James U
authors.initials: JU
authors.lastname: Bowie
mesh_terms: D019852:Diacylglycerol Kinase / Q000737:chemistry* / Q000378:metabolism*; D004789:Enzyme Activation; D004795:Enzyme Stability; D004926:Escherichia coli / Q000201:enzymology; D007700:Kinetics; D008958:Models, Molecular; D055503:Protein Multimerization; D020836:Protein Structure, Quaternary; D021122:Protein Subunits / Q000737:chemistry; D058767:Protein Unfolding
chemical_list: D021122:Protein Subunits; D019852:Diacylglycerol Kinase
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