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Information on EC - protein geranylgeranyltransferase type I

for references in articles please use BRENDA:EC2.5.1.59
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IUBMB Comments
This enzyme, along with protein farnesyltransferase (EC and protein geranylgeranyltransferase type II (EC, constitutes the protein prenyltransferase family of enzymes. Catalyses the formation of a thioether linkage between the C-1 atom of the geranylgeranyl group and a cysteine residue fourth from the C-terminus of the protein. These protein acceptors have the C-terminal sequence CA1A2X, where the terminal residue, X, is preferably leucine; serine, methionine, alanine or glutamine makes the protein a substrate for EC The enzymes are relaxed in specificity for A1, but cannot act if A2 is aromatic. Known targets of this enzyme include most gamma-subunits of heterotrimeric G proteins and Ras-related GTPases such as members of the Ras and Rac/Rho families. A zinc metalloenzyme. The Zn2+ is required for peptide, but not for isoprenoid, substrate binding.
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The expected taxonomic range for this enzyme is: Eukaryota, Bacteria
CAAX geranylgeranyltransferase, CaaX prenyltransferase, CaGGTase-I, CDC43, geranylgeranyl protein transferase type I, geranylgeranyltransferase I, geranylgeranyltransferase type I, geranylgeranyltransferase type-I, geranylgeranyltransferase-1, geranylgeranyltransferase-I, more
geranylgeranyl diphosphate + protein-cysteine = S-geranylgeranyl-protein + diphosphate
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