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J Biol Chem. 2008 Mar 7;283(10):6175-83. doi: 10.1074/jbc.M701008200. Epub 2007 Dec 31.

The endoplasmic reticulum exit of glutamate transporter is regulated by the inducible mammalian Yip6b/GTRAP3-18 protein.

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1
Department of Neuroscience, Johns Hopkins University, 625 N. Wolfe Street, Baltimore, MD 21287, USA.

Abstract

GTRAP3-18 interacts with and reduces the activity of the neuronal specific Na(+)/K(+) glutamate transporter, EAAC1 both in vitro and in vivo. GTRAP3-18 and the related isoform, JM4, are distant relatives of the Rab GTPase-interacting factor PRA1, and share a topology of four transmembrane domains and cytosolic termini. GTRAP3-18 and JM4 are resident endoplasmic reticulum (ER) proteins. The physiological role of GTRAP3-18 is poorly understood. We demonstrate for the first time that GTRAP3-18 is a regulator of ER protein trafficking. Expression of GTRAP3-18 delays the ER exit of EAAC1, as well as other members of the excitatory amino acid transporter family. GTRAP3-18 uses hydrophobic domain interactions in the ER membrane to self-associate and cytoplasmic interactions at the C terminus to regulate trafficking. The features of GTRAP3-18 activity are consistent with recent phylogenic sequence analyses suggesting GTRAP3-18 and JM4 be reclassified as mammalian isoforms of the yeast protein family Yip, Yip6b, and Yip6a, respectively.

PMID:
18167356
PMCID:
PMC4502942
DOI:
10.1074/jbc.M701008200
[Indexed for MEDLINE]
Free PMC Article
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