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  Domain Name: PPTA
Protein prenyltransferase alpha subunit repeat. Both farnesyltransferase (FT) and geranylgeranyltransferase 1 (GGT1) recognise a CaaX motif on their substrates where 'a' stands for preferably aliphatic residues, whereas GGT2 recognises a completely different motif. Important substrates for FT include, amongst others, many members of the Ras superfamily. GGT1 substrates include some of the other small GTPases and GGT2 substrates include the Rab family.