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Molecular Pharmacology

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Abstract

Vasopressin V2 receptor mutants that cause X-linked nephrogenic diabetes insipidus: analysis of expression, processing, and function.

A Oksche, R Schülein, C Rutz, U Liebenhoff, J Dickson, H Müller, M Birnbaumer and W Rosenthal
Molecular Pharmacology October 1996, 50 (4) 820-828;
A Oksche
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R Schülein
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C Rutz
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U Liebenhoff
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J Dickson
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H Müller
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M Birnbaumer
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W Rosenthal
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Abstract

We investigated the biochemical and functional properties of five vasopressin V2 receptor mutants (L44F, L44P, W164S, S167L, and S167T) that were recently described in families with a history of X-linked nephrogenic diabetes insipidus. COS.M6 cells transfected with cDNA encoding these mutants acquired < 4% specific [3H]arginine vasopressin (AVP) binding sites on the cell surface in comparison with cells transfected with cDNA coding for the wild-type receptor. Membrane preparations from COS.M6 cells or human embryonic kidney 293 cells expressing these mutants did not respond with an increase in adenylyl cyclase activity in response to AVP, which is in contrast to membranes from cells expressing the wild-type. By analyzing fusion proteins of the V2 receptor and Escherichia coli alkaline phosphatase attached to the carboxyl terminus of the receptor moiety, we found that the mutants L44P, W164S, S167L, and S167T lacked complex glycosylation and were expressed at low levels. The data suggest that the mutants L44P, W164S, S167T, and S167L are misfolded and therefore retained within the endoplasmic reticulum and degraded. In contrast, the fusion proteins carrying the mutant L44F and the in vitro mutant S167A were expressed in their mature form at wild-type levels; however, only the mutant S167A was functionally active. Site-directed mutagenesis of S167 revealed that elimination of the endogenous hydroxyl group (S167A) yielded a protein with properties identical to those of the wild-type receptor, whereas both the introduction of a methyl group (S167T) and the replacement of the hydroxyl group by an isopropyl group (S167L) profoundly disturbed receptor processing. The data show that minute changes at codon 167 nearly abolish expression of a mature protein, thus defining structural requirements of this codon.

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Molecular Pharmacology
Vol. 50, Issue 4
1 Oct 1996
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Abstract

Vasopressin V2 receptor mutants that cause X-linked nephrogenic diabetes insipidus: analysis of expression, processing, and function.

A Oksche, R Schülein, C Rutz, U Liebenhoff, J Dickson, H Müller, M Birnbaumer and W Rosenthal
Molecular Pharmacology October 1, 1996, 50 (4) 820-828;

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Abstract

Vasopressin V2 receptor mutants that cause X-linked nephrogenic diabetes insipidus: analysis of expression, processing, and function.

A Oksche, R Schülein, C Rutz, U Liebenhoff, J Dickson, H Müller, M Birnbaumer and W Rosenthal
Molecular Pharmacology October 1, 1996, 50 (4) 820-828;
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