Structural highlights
3duf is a 10 chain structure with sequence from Geobacillus stearothermophilus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
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| Ligands: | , , |
| Related: | 1w85, 1w88, 3dv0, 3dva |
| Gene: | pdhA (Geobacillus stearothermophilus), pdhB (Geobacillus stearothermophilus), pdhC (Geobacillus stearothermophilus) |
| Activity: | Pyruvate dehydrogenase (acetyl-transferring), with EC number 1.2.4.1 |
| Resources: | FirstGlance, OCA, RCSB, PDBsum |
Function
[ODP2_BACST] The pyruvate dehydrogenase complex catalyzes the overall conversion of pyruvate to acetyl-CoA and CO(2). It contains multiple copies of three enzymatic components: pyruvate dehydrogenase (E1), dihydrolipoamide acetyltransferase (E2) and lipoamide dehydrogenase (E3). [ODPB_BACST] The pyruvate dehydrogenase complex catalyzes the overall conversion of pyruvate to acetyl-CoA and CO(2). It contains multiple copies of three enzymatic components: pyruvate dehydrogenase (E1), dihydrolipoamide acetyltransferase (E2) and lipoamide dehydrogenase (E3).
Evolutionary Conservation
Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.
Publication Abstract from PubMed
The pyruvate dehydrogenase multienzyme assembly (PDH) generates acetyl coenzyme A and reducing equivalents from pyruvate in a multiple-step process that is a nexus of central metabolism. We report crystal structures of the Geobacillus stearothermophilus PDH E1p subunit with ligands that mimic the prereaction complex and the postdecarboxylation product. The structures implicate residues that help to orient substrates, nurture intermediates, and organize surface loops so that they can engage a mobile lipoyl domain that receives the acetyl group and shuttles it to the next active site. The structural and enzymatic data suggest that H128beta performs a dual role: first, as electrostatic catalyst of the reaction of pyruvate with the thiamine cofactor; and second, as a proton donor in the second reaction of acetyl group with the lipoate. We also identify I206alpha as a key residue in mediating the conformation of active-site loops. We propose that a simple conformational flip of the H271alpha side chain assists transfer of the acetyl group from thiamine cofactor to lipoyl domain in synchrony with reduction of the dithiolane ring.
Snapshots of catalysis in the e1 subunit of the pyruvate dehydrogenase multienzyme complex.,Pei XY, Titman CM, Frank RA, Leeper FJ, Luisi BF Structure. 2008 Dec 12;16(12):1860-72. PMID:19081062[1]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
See Also
References
- ↑ Pei XY, Titman CM, Frank RA, Leeper FJ, Luisi BF. Snapshots of catalysis in the e1 subunit of the pyruvate dehydrogenase multienzyme complex. Structure. 2008 Dec 12;16(12):1860-72. PMID:19081062 doi:S0969-2126(08)00414-0
