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EMBO J February 3, 2010; 29 (3): 532-45.

Identification of a novel Bves function: regulation of vesicular transport.

Hager HA , Roberts RJ , Cross EE , Proux-Gillardeaux V , Bader DM .

Blood vessel/epicardial substance (Bves) is a transmembrane protein that influences cell adhesion and motility through unknown mechanisms. We have discovered that Bves directly interacts with VAMP3, a SNARE protein that facilitates vesicular transport and specifically recycles transferrin and beta-1-integrin. Two independent assays document that cells expressing a mutated form of Bves are severely impaired in the recycling of these molecules, a phenotype consistent with disruption of VAMP3 function. Using Morpholino knockdown in Xenopus laevis, we demonstrate that elimination of Bves function specifically inhibits transferrin receptor recycling, and results in gastrulation defects previously reported with impaired integrin-dependent cell movements. Kymographic analysis of Bves-depleted primary and cultured cells reveals severe impairment of cell spreading and adhesion on fibronectin, indicative of disruption of integrin-mediated adhesion. Taken together, these data demonstrate that Bves interacts with VAMP3 and facilitates receptor recycling both in vitro and during early development. Thus, this study establishes a newly identified role for Bves in vesicular transport and reveals a novel, broadly applied mechanism governing SNARE protein function.

PubMed ID: 20057356
PMC ID: PMC2830705
Article link: EMBO J
Grant support: [+]
Genes referenced: bves fn1 tf vamp3
Morpholinos: bves MO1 vamp3 MO1

References [+] :
Andrée, Isolation and characterization of the novel popeye gene family expressed in skeletal muscle and heart. 2000, Pubmed

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