catalytic activity:Geranylgeranyl diphosphate + protein-cysteine = S-geranylgeranyl-protein + diphosphate.,cofactor:Binds 1 zinc ion per dimer.,enzyme regulation:The enzymatic reaction requires the aid of a Rab escort protein (also called component A).,function:Catalyzes the transfer of a geranyl-geranyl moiety from geranyl-geranyl pyrophosphate to both cysteines in Rab proteins with an -XXCC, -XCXC and -CCXX C-terminal, such as RAB1A, RAB3A and RAB5A respectively.,similarity:Belongs to the protein prenyltransferase subunit alpha family.,similarity:Contains 6 PFTA repeats.,subunit:Heterodimer of an alpha and a beta subunit, collectively called component B.,
plasma membrane,Rab-protein geranylgeranyltransferase complex,
Fetal brain,Lung,Thymus,Tongue,
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