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

Alicia M. Ruggiero, Yiting Liu, Svetlana Vidensky, Susanne Maier, Elizabeth Jung, Hesso Farhan, Michael B. Robinson, Harald H. Sitte, Jeffrey D. Rothstein

Research output: Contribution to journalArticle

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.

Original languageEnglish (US)
Pages (from-to)6175-6183
Number of pages9
JournalJournal of Biological Chemistry
Volume283
Issue number10
DOIs
StatePublished - Mar 7 2008

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

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