共 46 条
Multiple regions contribute to membrane targeting of Rab GTPases
被引:87
作者:

Ali, BR
论文数: 0 引用数: 0
h-index: 0
机构: Univ London Imperial Coll Sci Technol & Med, Fac Med, Div Biomed Sci, London SW7 2AZ, England

Wasmeier, C
论文数: 0 引用数: 0
h-index: 0
机构: Univ London Imperial Coll Sci Technol & Med, Fac Med, Div Biomed Sci, London SW7 2AZ, England

Lamoreux, L
论文数: 0 引用数: 0
h-index: 0
机构: Univ London Imperial Coll Sci Technol & Med, Fac Med, Div Biomed Sci, London SW7 2AZ, England

Strom, M
论文数: 0 引用数: 0
h-index: 0
机构: Univ London Imperial Coll Sci Technol & Med, Fac Med, Div Biomed Sci, London SW7 2AZ, England

Seabra, MC
论文数: 0 引用数: 0
h-index: 0
机构:
Univ London Imperial Coll Sci Technol & Med, Fac Med, Div Biomed Sci, London SW7 2AZ, England Univ London Imperial Coll Sci Technol & Med, Fac Med, Div Biomed Sci, London SW7 2AZ, England
机构:
[1] Univ London Imperial Coll Sci Technol & Med, Fac Med, Div Biomed Sci, London SW7 2AZ, England
[2] St George Hosp, Sch Med, Dept Basic Med Sci, London SW17 0RE, England
[3] Texas A&M Univ, College Stn, TX 77843 USA
关键词:
membrane targeting;
membrane traffic;
GTP-binding proteins;
Rab proteins;
geranylgeranyl;
endosome;
melanosome;
D O I:
10.1242/jcs.01542
中图分类号:
Q2 [细胞生物学];
学科分类号:
071009 ;
090102 ;
摘要:
Small GTPases of the Rab family are key regulators of membrane trafficking. Each Rab shows a characteristic subcellular distribution, and may serve as an important determinant of organelle identity. The molecular mechanisms responsible for targeting Rabs to specific intracellular compartments, however, remain poorly understood. The divergent C-terminal hypervariable region was postulated to contain Rab targeting information. We generated a series of hybrid Rab proteins by exchanging the hypervariable domains of Rab1a, Rab2a, Rab5a, Rab7 and Rab27a, and analysed their subcellular localisations. We found that the various hybrid proteins retained their targeting to the parent organelle and were functionally active. We conclude that the hypervariable region does not contain a general Rab targeting signal. Furthermore, we identified other regions within the RabF and RabSF motifs that are required for specific targeting of Rab27a to secretory granules or melanosomes, and Rab5a to endosomes. We observed only partial overlap between targeting-determining regions in the Rab proteins examined, suggesting that Rab recruitment may be complex and at least partially Rab-specific. Mutations in these targeting-determining regions induced localisation to the ER, an observation that further strengthens our previous finding that ER/Golgi membranes serve as the default location for Rabs that have lost targeting information.
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页码:6401 / 6412
页数:12
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