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MBC in Press, published online ahead of print May 29, 2003
Mol. Biol. Cell 10.1091/E03-04-0227

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Submitted on April 11, 2003
Accepted on April 24, 2003

Molecular Evolution of the REP/GDI Superfamily

Christelle Alory1 and William E. Balch1*

1 Departments of Cell and Molecular Biology and The Institute for Childhood and Neglected Diseases, The Scripps Research Institute, 10550 N. Torrey Pines Road, La Jolla, CA 92130, Phone 858-784-2310, Fax 858-784-9126

* Corresponding author. E-mail address: webalch{at}scripps.edu.

Prenylation of Rab GTPases regulating vesicle traffic by Rab geranylgeranyltransferase (RabGGTase) requires a complex formed by the association of newly synthesized Rab proteins with Rab-escort-protein (REP), the choroideremia-gene-product that is mutated in disease leading to loss of vision. Following delivery to the membrane by the REP-Rab complex, subsequent recycling to the cytosol requires the REP-related guanine-nucleotide-dissociation-inhibitor (GDI). While REP and GDI share common Rab-binding properties, GDI cannot assist in Rab prenylation and REP cannot retrieve Rab proteins from the membranes. We have now isolated REP mutant proteins that are able to partially function as both REP and GDI. These results provide a molecular insight into the functional and evolutionary organization of the REP/GDI superfamily.




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