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Crystal structure of the carboxyltransferase subunit of the bacterial sodium ion pump glutaconyl-coenzyme A decarboxylase

Wendt, Kerstin S., Schall, Iris, Huber, Robert, Buckel, Wolfgang and Jacob, Uwe 2003. Crystal structure of the carboxyltransferase subunit of the bacterial sodium ion pump glutaconyl-coenzyme A decarboxylase. The EMBO Journal 22 (14) , pp. 3493-3502. 10.1093/emboj/cdg358

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Abstract

Glutaconyl‐CoA decarboxylase is a biotin‐dependent ion pump whereby the free energy of the glutaconyl‐CoA decarboxylation to crotonyl‐CoA drives the electrogenic transport of sodium ions from the cytoplasm into the periplasm. Here we present the crystal structure of the decarboxylase subunit (Gcdα) from Acidaminococcus fermentans and its complex with glutaconyl‐CoA. The active sites of the dimeric Gcdα lie at the two interfaces between the mono mers, whereas the N‐terminal domain provides the glutaconyl‐CoA‐binding site and the C‐terminal domain binds the biotinyllysine moiety. The Gcdα catalyses the transfer of carbon dioxide from glutaconyl‐CoA to a biotin carrier (Gcdγ) that subsequently is decarboxylated by the carboxybiotin decarboxylation site within the actual Na+ pump (Gcdβ). The analysis of the active site lead to a novel mechanism for the biotin‐dependent carboxy transfer whereby biotin acts as general acid. Furthermore, we propose a holoenzyme assembly in which the water‐filled central channel of the Gcdα dimer lies co‐axial with the ion channel (Gcdβ). The central channel is blocked by arginines against passage of sodium ions which might enter the central channel through two side channels.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Biosciences
Subjects: Q Science > QD Chemistry
Q Science > QH Natural history > QH301 Biology
Publisher: Nature Publishing Group
ISSN: 1460-2075
Last Modified: 24 Jun 2017 11:00
URI: http://orca-mwe.cf.ac.uk/id/eprint/70184

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