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Endogenous dihydrolipoamide acetyltransferase (E2) core of pyruvate dehydrogenase complex from pig heart
Structural highlights
FunctionA0A5G2QLQ1_PIG As part of the pyruvate dehydrogenase complex, catalyzes the transfers of an acetyl group to a lipoic acid moiety. The pyruvate dehydrogenase complex, catalyzes the overall conversion of pyruvate to acetyl-CoA and CO(2), and thereby links cytoplasmic glycolysis and the mitochondrial tricarboxylic acid (TCA) cycle.[ARBA:ARBA00045906] The pyruvate dehydrogenase complex catalyzes the overall conversion of pyruvate to acetyl-CoA and CO(2).[RuleBase:RU361137] Publication Abstract from PubMedThe multi-enzyme pyruvate dehydrogenase complex (PDHc) links glycolysis to the citric acid cycle and plays vital roles in metabolism, energy production, and cellular signaling. Although all components have been individually characterized, the intact PDHc structure remains unclear, hampering our understanding of its composition and dynamical catalytic mechanisms. Here, we report the in-situ architecture of intact mammalian PDHc by cryo-electron tomography. The organization of peripheral E1 and E3 components varies substantially among the observed PDHcs, with an average of 21 E1 surrounding each PDHc core, and up to 12 E3 locating primarily along the pentagonal openings. In addition, we observed dynamic interactions of the substrate translocating lipoyl domains (LDs) with both E1 and E2, and the interaction interfaces were further analyzed by molecular dynamics simulations. By revealing intrinsic dynamics of PDHc peripheral compositions, our findings indicate a distinctive activity regulation mechanism, through which the number of E1, E3 and functional LDs may be coordinated to meet constantly changing demands of metabolism. Dynamics of the mammalian pyruvate dehydrogenase complex revealed by in-situ structural analysis.,Wang C, Ma C, Xu Y, Chang S, Wu H, Yan C, Chen J, Wu Y, An S, Xu J, Han Q, Jiang Y, Jiang Z, Chu X, Gao H, Zhang X, Chang Y Nat Commun. 2025 Jan 22;16(1):917. doi: 10.1038/s41467-025-56171-8. PMID:39843418[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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