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Title: Structure and function of the divalent anion/Na+ symporter from Vibrio cholerae and a humanized variant

Journal Article · · Nature Communications
DOI:https://doi.org/10.1038/ncomms15009· OSTI ID:1368268
 [1];  [1];  [1];  [1];  [1]
  1. Rosalind Franklin Univ. of Medicine and Science, North Chicago, IL (United States)

Integral membrane proteins of the divalent anion/Na+ symporter (DASS) family translocate dicarboxylate, tricarboxylate or sulphate across cell membranes, typically by utilizing the preexisting Na+ gradient. The molecular determinants for substrate recognition by DASS remain obscure, largely owing to the absence of any substrate-bound DASS structure. Here we present 2.8-Å resolution X-ray structures of VcINDY, a DASS from Vibrio cholerae that catalyses the co-transport of Na+ and succinate. These structures portray the Na+-bound VcINDY in complexes with succinate and citrate, elucidating the binding sites for substrate and two Na+ ions. Furthermore, we report the structures of a humanized variant of VcINDY in complexes with succinate and citrate, which predict how a human citrate-transporting DASS may interact with its bound substrate. Our findings provide insights into metabolite transport by DASS, establishing a molecular basis for future studies on the regulation of this transport process.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Organization:
National Institutes of Health (NIH)
Grant/Contract Number:
R01-GM094195
OSTI ID:
1368268
Journal Information:
Nature Communications, Vol. 8, Issue 1; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
ENGLISH
Citation Metrics:
Cited by: 30 works
Citation information provided by
Web of Science

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