{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,10]],"date-time":"2026-04-10T02:41:39Z","timestamp":1775788899474,"version":"3.50.1"},"reference-count":63,"publisher":"American Society for Cell Biology (ASCB)","issue":"5","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["MBoC"],"published-print":{"date-parts":[[2003,5]]},"abstract":"<jats:p>Rab GTPases are regulators of membrane traffic. Rabs specifically associate with target membranes via the attachment of (usually) two geranylgeranyl groups in a reaction involving Rab escort protein and Rab geranylgeranyl transferase. In contrast, related GTPases are singly prenylated by CAAX prenyl transferases. We report that di-geranylgeranyl modification is important for targeting of Rab5a and Rab27a to endosomes and melanosomes, respectively. Transient expression of EGFP-Rab5 mutants containing two prenylatable cysteines (CGC, CC, CCQNI, and CCA) in HeLa cells did not affect endosomal targeting or function, whereas mono-cysteine mutants (CSLG, CVLL, or CVIM) were mistargeted to the endoplasmic reticulum (ER) and were nonfunctional. Similarly, Rab27aCVLL mutant is also mistargeted to the ER and transgenic expression on a Rab27a null background (Rab27a<jats:sup>ash<\/jats:sup>) did not rescue the coat color phenotype, suggesting that Rab27aCVLL is not functional in vivo. CAAX prenyl transferase inhibition and temperature-shift experiments further suggest that Rabs, singly or doubly modified are recruited to membranes via a Rab escort protein\/Rab geranylgeranyl transferase-dependent mechanism that is distinct from the insertion of CAAX-containing GTPases. Finally, we show that both singly and doubly modified Rabs are extracted from membranes by RabGDI\u03b1 and propose that the mistargeting of Rabs to the ER results from loss of targeting information.<\/jats:p>","DOI":"10.1091\/mbc.e02-10-0639","type":"journal-article","created":{"date-parts":[[2003,2,12]],"date-time":"2003-02-12T20:36:53Z","timestamp":1045082213000},"page":"1882-1899","source":"Crossref","is-referenced-by-count":143,"title":["Membrane Targeting of Rab GTPases Is Influenced by the Prenylation Motif"],"prefix":"10.1091","volume":"14","author":[{"given":"Anita Q.","family":"Gomes","sequence":"first","affiliation":[{"name":"Cell and Molecular Biology, Division of Biomedical Sciences, Faculty of Medicine, Imperial College, London SW7 2AZ, United Kingdom"}]},{"given":"Bassam R.","family":"Ali","sequence":"additional","affiliation":[{"name":"Cell and Molecular Biology, Division of Biomedical Sciences, Faculty of Medicine, Imperial College, London SW7 2AZ, United Kingdom"}]},{"given":"Jos\u00e9 S.","family":"Ramalho","sequence":"additional","affiliation":[{"name":"Cell and Molecular Biology, Division of Biomedical Sciences, Faculty of Medicine, Imperial College, London SW7 2AZ, United Kingdom"}]},{"given":"Richard F.","family":"Godfrey","sequence":"additional","affiliation":[{"name":"Cell and Molecular Biology, Division of Biomedical Sciences, Faculty of Medicine, Imperial College, London SW7 2AZ, United Kingdom"}]},{"given":"Duarte C.","family":"Barral","sequence":"additional","affiliation":[{"name":"Cell and Molecular Biology, Division of Biomedical Sciences, Faculty of Medicine, Imperial College, London SW7 2AZ, United Kingdom"}]},{"given":"Alistair N.","family":"Hume","sequence":"additional","affiliation":[{"name":"Cell and Molecular Biology, Division of Biomedical Sciences, Faculty of Medicine, Imperial College, London SW7 2AZ, United Kingdom"}]},{"given":"Miguel C.","family":"Seabra","sequence":"additional","affiliation":[{"name":"Cell and Molecular Biology, Division of Biomedical Sciences, Faculty of Medicine, Imperial College, London SW7 2AZ, United Kingdom"}]}],"member":"1076","reference":[{"key":"REF1","doi-asserted-by":"crossref","unstructured":"Alexandrov, K., Horiuchi, H., Steele-Mortimer, O., Seabra, M.C., and Zerial, M. 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