1ebd

DIHYDROLIPOAMIDE DEHYDROGENASE COMPLEXED WITH THE BINDING DOMAIN OF THE DIHYDROLIPOAMIDE ACETYLASE

spinqualitylabelsall models 1ebd, resolution 2.60Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1ebd is a 3 chain structure with sequence from Geobacillus stearothermophilus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: FAD Activity: Dihydrolipoyl dehydrogenase, with EC number 1.8.1.4 Resources: FirstGlance, OCA, RCSB, PDBsum 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 BACKGROUND. The ubiquitous pyruvate dehydrogenase multienzyme complex is built around an octahedral or icosahedral core of dihydrolipoamide acetyltransferase (E2) chains, to which multiple copies of pyruvate decarboxylase (E1) and dihydrolipoamide dehydrogenase (E3) bind tightly but non-covalently. E2 is a flexible multidomain protein that mediates interactions with E1 and E3 through a remarkably small binding domain (E2BD). RESULTS. In the Bacillus stearothermophilus complex, the E2 core is an icosahedral assembly of 60 E2 chains. The crystal structure of the E3 dimer (101 kDa) complexed with E2BD (4 kDa) has been solved to 2.6 A resolution. Interactions between E3 and E2BD are dominated by an electrostatic zipper formed by Arg135 and Arg139 in the N-terminal helix of E2BD and Asp344 and Glu431 of one of the monomers of E3. E2BD interacts with both E3 monomers, but the binding site is located close to the twofold axis. Thus, in agreement with earlier biochemical results, it is impossible for two molecules of E2BD to bind simultaneously to one E3 dimer. CONCLUSIONS. Combining this new structure for the E3-E2BD complex with previously determined structures of the E2 catalytic domain and the E2 lipoyl domain creates a model of the E2 core showing how the lipoyl domain can move between the active sites of E2 and E3 in the multienzyme complex. Protein-protein interactions in the pyruvate dehydrogenase multienzyme complex: dihydrolipoamide dehydrogenase complexed with the binding domain of dihydrolipoamide acetyltransferase.,Mande SS, Sarfaty S, Allen MD, Perham RN, Hol WG Structure. 1996 Mar 15;4(3):277-86. PMID:8805537 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Dihydrolipoamide acetyltransferase Dihydrolipoamide dehydrogenase

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