Dual prenylation is required for Rab protein localization and function.

Abstract:

:The majority of Rab proteins are posttranslationally modified with two geranylgeranyl lipid moieties that enable their stable association with membranes. In this study, we present evidence to demonstrate that there is a specific lipid requirement for Rab protein localization and function. Substitution of different prenyl anchors on Rab GTPases does not lead to correct function. In the case of YPT1 and SEC4, two essential Rab genes in Saccharomyces cerevisiae, alternative lipid tails cannot support life when present as the sole source of YPT1 and SEC4. Furthermore, our data suggest that double geranyl-geranyl groups are required for Rab proteins to correctly localize to their characteristic organelle membrane. We have identified a factor, Yip1p that specifically binds the di-geranylgeranylated Rab and does not interact with mono-prenylated Rab proteins. This is the first demonstration that the double prenylation modification of Rab proteins is an important feature in the function of this small GTPase family and adds specific prenylation to the already known determinants of Rab localization.

journal_name

Mol Biol Cell

authors

Calero M,Chen CZ,Zhu W,Winand N,Havas KA,Gilbert PM,Burd CG,Collins RN

doi

10.1091/mbc.e02-11-0707

keywords:

subject

Has Abstract

pub_date

2003-05-01 00:00:00

pages

1852-67

issue

5

eissn

1059-1524

issn

1939-4586

pii

E02-11-0707

journal_volume

14

pub_type

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