Rapid and reversible inhibition of aquaporin-4 by zinc

Yoshinori Yukutake, Yoshinori Hirano, Makoto Suematsu, Masato Yasui

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36 Citations (Scopus)

Abstract

Aquaporin-4 (AQP4) is the predominant water channel in the brain. Although AQP4 plays an important role in brain water homeostasis, the molecular mechanisms of AQP4 regulation are not fully understood. In this report, we show how Zn2+ rapidly and reversibly decreases the water permeability of AQP4 when it is reconstituted into proteoliposomes. Mutagenesis analysis identified Cys178, located in cytoplasmic loop D, as a target residue of ZnCl2 inhibition. Moreover, treatment with diamide enhanced the inhibitory effects of ZnCl2. These results suggest that the water permeability of AQP4 may be regulated by dynamic changes in intracellular Zn2+ concentration linked to the cellular redox state.

Original languageEnglish
Pages (from-to)12059-12061
Number of pages3
JournalBiochemistry
Volume48
Issue number51
DOIs
Publication statusPublished - 2009 Dec 29

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ASJC Scopus subject areas

  • Biochemistry

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