PMID: 2123808Dec 1, 1990Paper

Posttranslational modification of proteins by isoprenoids in mammalian cells

FASEB Journal : Official Publication of the Federation of American Societies for Experimental Biology
W A Maltese

Abstract

Isoprenylation is a posttranslational modification that involves the formation of thioether bonds between cysteine and isoprenyl groups derived from pyrophosphate intermediates of the cholesterol biosynthetic pathway. Numerous isoprenylated proteins have been detected in mammalian cells. Those identified include K-, N-, and H-p21ras, ras-related GTP-binding proteins such as G25K (Gp), nuclear lamin B and prelamin A, and the gamma subunits of heterotrimeric G proteins. The modified cysteine is located in the fourth position from the carboxyl terminus in every protein where this has been studied. For p21ras, the last three amino acids are subsequently removed and the exposed cysteine is carboxylmethylated. Similar processing events may occur in lamin B and G protein gamma subunits, but the proteolytic cleavage in prelamin A occurs upstream from the modified cysteine. Lamin B and p21ras are modified by C15 farnesyl groups, whereas other proteins such as the G protein gamma subunits are modified by C20 geranylgeranyl chains. Separate enzymes may catalyze these modifications. The structural features that govern the ability of particular proteins to serve as substrates for isoprenylation by C15 or C20 groups are not completely define...Continue Reading

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