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Thematic review series: lipid posttranslational modifications Structural biology of protein farnesyltransferase and geranylgeranyltransferase type I Lane KT; Beese LSJ Lipid Res 2006[Apr]; 47 (4): 681-99More than 100 proteins necessary for eukaryotic cell growth, differentiation, and morphology require posttranslational modification by the covalent attachment of an isoprenoid lipid (prenylation). Prenylated proteins include members of the Ras, Rab, and Rho families, lamins, CENPE and CENPF, and the gamma subunit of many small heterotrimeric G proteins. This modification is catalyzed by the protein prenyltransferases: protein farnesyltransferase (FTase), protein geranylgeranyltransferase type I (GGTase-I), and GGTase-II (or RabGGTase). In this review, we examine the structural biology of FTase and GGTase-I (the CaaX prenyltransferases) to establish a framework for understanding the molecular basis of substrate specificity and mechanism. These enzymes have been identified in a number of species, including mammals, fungi, plants, and protists. Prenyltransferase structures include complexes that represent the major steps along the reaction path, as well as a number of complexes with clinically relevant inhibitors. Such complexes may assist in the design of inhibitors that could lead to treatments for cancer, viral infection, and a number of deadly parasitic diseases.|*Alkyl and Aryl Transferases/chemistry/metabolism[MESH]|Animals[MESH]|Binding Sites[MESH]|Cell Cycle/physiology[MESH]|Enzyme Inhibitors/chemistry/metabolism[MESH]|Humans[MESH]|Models, Molecular[MESH]|Molecular Structure[MESH]|Peptides/chemistry/metabolism[MESH]|Polyisoprenyl Phosphates/chemistry/metabolism[MESH]|Protein Processing, Post-Translational[MESH]|Protein Structure, Tertiary[MESH]|Substrate Specificity[MESH]|Zinc/metabolism[MESH] |
