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Disease‐causing V 2 Vasopressin Receptors are Retained in Different Compartments of the Early Secretory Pathway
Author(s) -
Hermosilla Ricardo,
Oueslati Morad,
Donalies Ute,
Schönenberger Eva,
Krause Eberhard,
Oksche Alexander,
Rosenthal Walter,
Schülein Ralf
Publication year - 2004
Publication title -
traffic
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.677
H-Index - 130
eISSN - 1600-0854
pISSN - 1398-9219
DOI - 10.1111/j.1600-0854.2004.00239.x
Subject(s) - biology , endoplasmic reticulum , microbiology and biotechnology , er retention , golgi apparatus , receptor , secretory pathway , mutant , vasopressin , reabsorption , vesicle , g protein coupled receptor , signal transduction , endocrinology , biochemistry , gene , kidney , membrane
The G protein‐coupled V 2 vasopressin receptor is crucially involved in water reabsorption in the renal collecting duct. Mutations in the human V 2 vasopressin receptor gene cause nephrogenic diabetes insipidus. Many of the disease‐causing mutants are retained intracellularly by the quality control system of the early secretory pathway. It was previously thought that quality control system is restricted to the endoplasmic reticulum (ER). Here, we have examined the retention mechanisms of eight V 2 vasopressin receptor mutants. We show that mutants L62P, ΔL62‐R64 and S167L are trapped exclusively in the ER. In contrast, mutants R143P, Y205C, InsQ292, V226E and R337X reach the ER/Golgi intermediate compartment (ERGIC) and are rerouted to the ER. The ability of the mutant receptors to reach the ERGIC is independent of their expression levels. Instead, it is determined by their folding state. Mutant receptors in the ERGIC may be sorted into retrograde transport vesicles by an interaction of an RXR motif in the third intracellular loop with the coatomer complex I. Our data show that disease‐causing mutants of a particular membrane protein may be retained in different compartments of the early secretory pathway and that the folding states of the proteins determine their retention mechanism.