9ev5

Corynebacterium glutamicum CS176 pyruvate:quinone oxidoreductase (PQO) in complex with FAD and thiamine diphosphate-magnesium ion

spinqualitylabelsall models 9ev5, resolution 1.86Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 9ev5 is a 4 chain structure with sequence from Corynebacterium glutamicum. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.863Å Ligands: FAD, MG, TPP Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function Q8NMG5_CORGL Publication Abstract from PubMed Pyruvate:quinone oxidoreductase (PQO) is a flavin-containing peripheral membrane enzyme catalyzing the decarboxylation of pyruvate to acetate and CO(2) with quinone as an electron acceptor. Here, we investigate PQO activity in Corynebacterium glutamicum, examine purified PQO, and describe the crystal structure of the native enzyme and a truncated version. The specific PQO activity was highest in stationary phase cells grown in complex medium, lower in cells grown in complex medium containing glucose or acetate, and lowest in cells grown in minimal acetate-medium. A similar pattern with about 30-fold higher specific PQO activities was observed in C. glutamicum with plasmid-bound pqo expression under the control of the tac promoter, indicating that the differences in PQO activity are likely due to post-transcriptional control. Continuous cultivation of C. glutamicum at dilution rates between 0.05 and 0.4 h(-1) revealed a negative correlation between PQO activity and growth rate. Kinetic analysis of PQO enzymes purified from cells grown in complex or in minimal acetate-medium revealed substantial differences in specific activity (72.3 vs. 11.9 U.mg protein(-1)) and turnover number (k(cat): 440 vs. 78 s(-1), respectively), suggesting post-translational modifications affecting PQO activity. Structural analysis of PQO revealed a homotetrameric arrangement very similar to the Escherichia coli pyruvate oxidase PoxB except for the C-terminal membrane binding domain, which exhibited a conformation markedly different from its PoxB counterpart. A truncated PQO variant lacking 17 C-terminal amino acids showed higher affinity to pyruvate and was independent of detergent activation, highlighting the importance of the C-terminus for enzyme activation and lipid binding. Corynebacterium glutamicum pyruvate:quinone oxidoreductase: an enigmatic metabolic enzyme with unusual structural features.,da Silva Lameira C, Munssinger S, Yang L, Eikmanns BJ, Bellinzoni M FEBS J. 2024 Jul 30. doi: 10.1111/febs.17232. PMID:39080980 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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