NRAMP family / Natural resistance-associated macrophage protein-like / cadmium ion transmembrane transporter activity / manganese ion transmembrane transporter activity / cellular response to iron ion / membrane / Divalent metal cation transporter
ジャーナル: Elife / 年: 2022 タイトル: Structural and functional properties of a magnesium transporter of the SLC11/NRAMP family. 著者: Karthik Ramanadane / Monique S Straub / Raimund Dutzler / Cristina Manatschal / 要旨: Members of the ubiquitous SLC11/NRAMP family catalyze the uptake of divalent transition metal ions into cells. They have evolved to efficiently select these trace elements from a large pool of Ca and ...Members of the ubiquitous SLC11/NRAMP family catalyze the uptake of divalent transition metal ions into cells. They have evolved to efficiently select these trace elements from a large pool of Ca and Mg, which are both orders of magnitude more abundant, and to concentrate them in the cytoplasm aided by the cotransport of H serving as energy source. In the present study, we have characterized a member of a distant clade of the family found in prokaryotes, termed NRMTs, that were proposed to function as transporters of Mg. The protein transports Mg and Mn but not Ca by a mechanism that is not coupled to H. Structures determined by cryo-EM and X-ray crystallography revealed a generally similar protein architecture compared to classical NRAMPs, with a restructured ion binding site whose increased volume provides suitable interactions with ions that likely have retained much of their hydration shell.