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TitleStructural insights into sodium transport by the oxaloacetate decarboxylase sodium pump.
Journal, issue, pagesElife, Vol. 9, Year 2020
Publish dateMay 27, 2020
AuthorsXin Xu / Huigang Shi / Xiaowen Gong / Pu Chen / Ying Gao / Xinzheng Zhang / Song Xiang /
PubMed AbstractThe oxaloacetate decarboxylase sodium pump (OAD) is a unique primary-active transporter that utilizes the free energy derived from oxaloacetate decarboxylation for sodium transport across the cell ...The oxaloacetate decarboxylase sodium pump (OAD) is a unique primary-active transporter that utilizes the free energy derived from oxaloacetate decarboxylation for sodium transport across the cell membrane. It is composed of 3 subunits: the α subunit catalyzes carboxyl-transfer from oxaloacetate to biotin, the membrane integrated β subunit catalyzes the subsequent carboxyl-biotin decarboxylation and the coupled sodium transport, the γ subunit interacts with the α and β subunits and stabilizes the OAD complex. We present here structure of the OAD βγ sub-complex. The structure revealed that the β and γ subunits form a βγ hetero-hexamer with extensive interactions between the subunits and shed light on the OAD holo-enzyme assembly. Structure-guided functional studies provided insights into the sodium binding sites in the β subunit and the coupling between carboxyl-biotin decarboxylation and sodium transport by the OAD β subunit.
External linksElife / PubMed:32459174 / PubMed Central
MethodsEM (single particle) / X-ray diffraction
Resolution3.9 - 4.403 Å
Structure data

9743

6iww

EMDB-9743, PDB-6iww:
Cryo-EM structure of the S. typhimurium oxaloacetate decarboxylase beta-gamma sub-complex
Method: EM (single particle) / Resolution: 3.9 Å

PDB-6iva:
Crystal structure of the S. typhimurium oxaloacetate decarboxylase beta-gamma sub-complex
Method: X-RAY DIFFRACTION / Resolution: 4.403 Å

Chemicals

ChemComp-LMT:
DODECYL-BETA-D-MALTOSIDE / detergent*YM

Source
  • salmonella enterica subsp. enterica serovar typhimurium (bacteria)
  • salmonella enterica i (bacteria)
KeywordsMEMBRANE PROTEIN / decarboxylase sodium pump / biotin-dependent decarboxylase / sodium pump

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