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© Research
Publication : Journal of neurochemistry

Interaction between the vesicular glutamate transporter type 1 and endophilin A1, a protein essential for endocytosis

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Journal of neurochemistry - 05 Apr 2006

Vinatier J, Herzog E, Plamont MA, Wojcik SM, Schmidt A, Brose N, Daviet L, El Mestikawy S, Giros B

Link to Pubmed [PMID] – 16606361

J. Neurochem. 2006 May;97(4):1111-25

In the nerve terminal, neurotransmitter is actively packaged into synaptic vesicles before its release by Ca2+-dependent exocytosis. The three vesicular glutamate transporters (VGLUT1, -2 and -3) are highly conserved proteins that display similar bioenergetic and pharmacological properties but are expressed in different brain areas. We used the divergent C-terminus of VGLUT1 as a bait in a yeast two-hybrid screen to identify and map the interaction between a proline-rich domain of VGLUT1 and the Src homology domain 3 (SH3) domain of endophilin. We further confirmed this interaction by using different glutathione-S-transferase-endophilin fusion proteins to pull down VGLUT1 from rat brain extracts. The expression profiles of the two genes and proteins were compared on rat brain sections, showing that endophilin is most highly expressed in regions and cells expressing VGLUT1. Double immunofluorescence in the rat cerebellum shows that most VGLUT1-positive terminals co-express endophilin, whereas VGLUT2-expressing terminals are often devoid of endophilin. However, neither VGLUT1 transport activity, endophilin enzymatic activity nor VGLUT1 synaptic targeting were altered by this interaction. Overall, the discovery of endophilin as a partner for VGLUT1 in nerve terminals strongly suggests the existence of functional differences between VGLUT1 and -2 terminals in their abilities to replenish vesicle pools.

http://www.ncbi.nlm.nih.gov/pubmed/16606361