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• W2036974504 endingPage "3952" @default.
• W2036974504 startingPage "3944" @default.
• W2036974504 abstract "Protein geranylgeranyltransferase-I (PGGT-I) and protein farnesyltransferase (PFT) attach geranylgeranyl and farnesyl groups, respectively, to the C termini of eukaryotic cell proteins. <i>In vitro</i>, PGGT-I and PFT can transfer both geranylgeranyl and farnesyl groups from geranylgeranyl pyrophosphate (GGPP) and farnesyl pyrophosphate (FPP) to their protein or peptide prenyl acceptor substrates. In the present study it is shown that PGGT-I binds GGPP 330-fold tighter than FPP and that PFT binds FPP 15-fold tighter than GGPP. Therefore, <i>in vivo</i>, where both GGPP and FPP compete for the binding to prenyltransferases, PGGT-I and PFT will likely be bound predominantly to GGPP and FPP, respectively. Previous studies have shown that K-Ras4B and the Ras-related GTPase TC21 are substrates for both PGGT-I and PFT <i>in vitro</i> It is shown that TC21 can compete with the C-terminal peptide of the γ subunit of heterotrimeric G proteins and with the C-terminal peptide of lamin B for geranylgeranylation by PGGT-I and for farnesylation by PFT, respectively. K-Ras4B competes in both cases but is almost exclusively farnesylated by PFT in the presence of the lamin B peptide competitor. Rapid and single turnover kinetic studies indicate that the rate constant for the PGGT-I-catalyzed geranylgeranyl transfer step of the reaction cycle is 14-fold larger than the steady-state turnover number, which indicates that the rate of the overall reaction is limited by a step subsequent to prenyl transfer such as release of products from the enzyme. PGGT-I-catalyzed farnesylation is 37-fold slower than geranylgeranylation and is limited by the farnesyl transfer step. These results together with earlier studies provide a paradigm for the substrate specificity of PGGT-I and PFT and provide information that is critical for the design of prenyltransferase inhibitors as anti-cancer agents." @default.
• W2036974504 created "2016-06-24" @default.
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• W2036974504 date "1997-02-01" @default.
• W2036974504 modified "2023-10-15" @default.
• W2036974504 title "Differential Prenyl Pyrophosphate Binding to Mammalian Protein Geranylgeranyltransferase-I and Protein Farnesyltransferase and Its Consequence on the Specificity of Protein Prenylation" @default.
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• W2036974504 doi "https://doi.org/10.1074/jbc.272.7.3944" @default.
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