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Role of Varp, a Rab21 exchange factor and TI-VAMP/VAMP7 partner, in neurite growth.

Authors: Burgo, A  Sotirakis, E  Simmler, MC  Verraes, A  Chamot, C  Simpson, JC  Lanzetti, L  Proux-Gillardeaux, V  Galli, T 
Citation: Burgo A, etal., EMBO Rep. 2009 Oct;10(10):1117-24. doi: 10.1038/embor.2009.186. Epub 2009 Sep 11.
Pubmed: (View Article at PubMed) PMID:19745841
DOI: Full-text: DOI:10.1038/embor.2009.186

The vesicular soluble N-ethylmaleimide-sensitive factor attachment protein receptor (SNARE) tetanus neurotoxin-insensitive vesicle-associated membrane protein (TI-VAMP/VAMP7) was previously shown to mediate an exocytic pathway involved in neurite growth, but its regulation is still largely unknown. Here we show that TI-VAMP interacts with the Vps9 domain and ankyrin-repeat-containing protein (Varp), a guanine nucleotide exchange factor (GEF) of the small GTPase Rab21, through a specific domain herein called the interacting domain (ID). Varp, TI-VAMP and Rab21 co-localize in the perinuclear region of differentiating hippocampal neurons and transiently in transport vesicles in the shaft of neurites. Silencing the expression of Varp by RNA interference or expressing ID or a form of Varp deprived of its Vps9 domain impairs neurite growth. Furthermore, the mutant form of Rab21, defective in GTP hydrolysis, enhances neurite growth. We conclude that Varp is a positive regulator of neurite growth through both its GEF activity and its interaction with TI-VAMP.


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CRRD Object Information
CRRD ID: 8554110
Created: 2014-05-08
Species: All species
Last Modified: 2014-05-08
Status: ACTIVE


RGD is funded by grant HL64541 from the National Heart, Lung, and Blood Institute on behalf of the NIH.