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Structure-Based Engineering of Lithium-Transport Capacity in an Archaeal Sodium-Calcium Exchanger

机译:基于结构的古钠钙交换器中锂输运能力的工程

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摘要

Members of the Ca2+/cation exchanger superfamily (Ca2+/CA) share structural similarities (including highly conserved ion-coordinating residues) while exhibiting differential selectivity for Ca2+, Na+, H+, K+, and Li+. The archaeal Na+/Ca2+ exchanger (NCX_Mj) and its mammalian orthologs are highly selective for Na+, whereas the mitochondrial ortholog (NCLX) can transport either Li+ or Na+ in exchange with Ca2+. Here, structure-based replacement of ion-coordinating residues in NCX_Mj resulted in a capacity for transporting either Na+ or Li+, similar to the case for NCLX. This engineered protein may serve as a model for elucidating the mechanisms underlying ion selectivity and ion-coupled alternating access in NCX and similar proteins.
机译:Ca2 + /阳离子交换剂超家族(Ca2 + / CA)的成员具有相似的结构(包括高度保守的离子配位残基),同时对Ca2 +,Na +,H +,K +和Li +具有不同的选择性。古代的Na + / Ca2 +交换子(NCX_Mj)及其哺乳动物直系同源物对Na +具有高度选择性,而线粒体直系同源物(NCLX)可以转运Li +或Na +来交换Ca2 +。在这里,基于结构的NCX_Mj中离子配位残基的置换产生了转运Na +或Li +的能力,类似于NCLX的情况。该工程蛋白可以作为模型,阐明在NCX和类似蛋白中离子选择性和离子耦合交替进入的机制。

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