Protein Domain : Rab protein geranylgeranyltransferase component A IPR001738

Type	Family
Description	Rab proteins constitute a family of small GTPases that serve a regulatory role in vesicular membrane traffic [ , ]; C-terminal geranylgeranylation is crucial for their membrane association and function. This post-translational modification is catalysed by Rab geranylgeranyl transferase (Rab-GGTase), a multi-subunit enzyme that contains a catalytic heterodimer and an accessory component, termed Rab escort protein (REP)-1 [, ]. REP-1 presents newly-synthesised Rab proteins to the catalytic component, and forms a stable complex with the prenylated proteins following the transfer reaction.cDNA cloning of component A of rat Rab geranylgeranyl transferase (REP) confirms its resemblance to Rab3A guanine nucleotide dissociation inhibitor (GDI) and its identity with the human choroideremia gene product []. A genetic defect in REP underlies human choroideremia. Choroideraemia (or tapetochoroidal dystrophy) is a common form of X-linked blindness characterised by progressive dystrophy of the choroid, retinal pigment epithelium and retina [, , ].
Short Name	Rab_escort