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lüll Prenylation of Rab GTPases: molecular mechanisms and involvement in genetic disease Pereira-Leal JB; Hume AN; Seabra MCFEBS Lett 2001[Jun]; 498 (2-3): 197-200Small GTPases of the Rab family regulate membrane transport pathways. More than 50 mammalian Rab proteins are known, many with transport step-specific localisation. Rabs must associate with cellular membranes for activity and membrane attachment is mediated by prenyl (geranylgeranyl) post-translational modification. Mutations in genes encoding proteins essential for the geranylgeranylation reaction, Rab escort protein and Rab geranylgeranyl transferase, underlie genetic diseases. Choroideremia patients have loss of function mutations in REP1 and the murine Hermansky-Pudlak syndrome model gunmetal possesses a splice-site mutation in the alpha-subunit of RGGT. Here we discuss recent insights into Rab prenylation and advances towards our understanding of both diseases.|Adaptor Proteins, Signal Transducing[MESH]|Alkyl and Aryl Transferases/*metabolism[MESH]|Amino Acid Motifs[MESH]|Animals[MESH]|Choroideremia/genetics/*metabolism[MESH]|Hermanski-Pudlak Syndrome/genetics/*metabolism[MESH]|Humans[MESH]|Mice[MESH]|Mutation[MESH]|Protein Prenylation[MESH]|rab GTP-Binding Proteins/genetics/*metabolism[MESH] |