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Biochem Soc Trans. 2005 Nov;33(Pt 5):1012-5.

Do protein-lipid interactions determine the recognition of transmembrane helices at the ER translocon?

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Department of Physiology and Biophysics and Program in Macromolecular Structure, University of California at Irvine, Irvine, CA 92697, USA.


Membrane-protein integration, folding and assembly processes in vivo depend on complex targeting, translocation, chaperoning, and sorting machineries that somehow read the 'molecular code' built into the nascent polypeptide, ultimately producing a properly folded protein integrated into the correct target membrane. Although the main molecular constituents and the basic mechanistic principles of many of these machines are known in outline, the codes remain poorly defined and there is little quantitative information on how protein sequence affects the final structure of membrane proteins. By carefully designing model protein constructs, we have derived the first true biological hydrophobicity scale and have been able to get a first impression of how the position of a given type of residue within a transmembrane segment affects its ability to promote membrane insertion.

[Indexed for MEDLINE]

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