ZnT-1 extrudes zinc from mammalian cells functioning as a Zn 2+/H+ exchanger

Eden Shusterman, Ofer Beharier, Levy Shiri, Raz Zarivach, Yoram Etzion, Craig R. Campbell, Il Ha Lee, Ken Okabayashi, Anuwat Dinudom, David I. Cook, Amos Katz, Arie Moran

Research output: Contribution to journalArticlepeer-review


ZnT-1 is a Cation Diffusion Facilitator (CDF) family protein, and is present throughout the phylogenetic tree from bacteria to humans. Since its original cloning in 1995, ZnT-1 has been considered to be the major Zn 2+ extruding transporter, based on its ability to protect cells against zinc toxicity. However, experimental evidence for ZnT-1 induced Zn 2+ extrusion was not convincing. In the present study, based on the 3D crystal structure of the ZnT-1 homologue, YiiP, that predicts a homodimer that utilizes the H+ electrochemical gradient to facilitate Zn 2+ efflux, we demonstrate ZnT-1 dependent Zn2+ efflux from HEK 293T cells using FluoZin-3 and Fura 2 by single cell microscope based fluorescent imaging. ZnT-1 facilitates zinc efflux in a sodium-independent, pH-driven and calcium-sensitive manner. Moreover, substitution of two amino acids in the putative zinc binding domain of ZnT-1 led to nullification of Zn2+ efflux and rendered the mutated protein incapable of protecting cells against Zn2+ toxicity. Our results demonstrate that ZnT-1 extrudes zinc from mammalian cells by functioning as a Zn2+/H + exchanger.

Original languageEnglish
Pages (from-to)1656-1663
Number of pages8
Issue number9
StatePublished - 1 Jan 2014

All Science Journal Classification (ASJC) codes

  • Medicine(all)


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