TY - JOUR
T1 - The endoplasmic reticulum exit of glutamate transporter is regulated by the inducible mammalian Yip6b/GTRAP3-18 protein
AU - Ruggiero, Alicia M.
AU - Liu, Yiting
AU - Vidensky, Svetlana
AU - Maier, Susanne
AU - Jung, Elizabeth
AU - Farhan, Hesso
AU - Robinson, Michael B.
AU - Sitte, Harald H.
AU - Rothstein, Jeffrey D.
PY - 2008/3/7
Y1 - 2008/3/7
N2 - 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.
AB - 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.
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U2 - 10.1074/jbc.M701008200
DO - 10.1074/jbc.M701008200
M3 - Article
C2 - 18167356
AN - SCOPUS:41949115734
SN - 0021-9258
VL - 283
SP - 6175
EP - 6183
JO - Journal of Biological Chemistry
JF - Journal of Biological Chemistry
IS - 10
ER -