2iaa

Crystal Structure of an Electron Transfer Complex Between Aromatic Amine Dephydrogenase and Azurin from Alcaligenes Faecalis (Form 2)

spinqualitylabelsall models 2iaa, resolution 1.95Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2iaa is a 5 chain structure with sequence from Alcaligenes faecalis. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: CU NonStd Res: TRQ Related: 2ah1, 2h3x, 2h47 Activity: Aralkylamine dehydrogenase (azurin), with EC number 1.4.9.2 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [AAUB_ALCFA] Oxidizes primary aromatic amines and, more slowly, some long-chain aliphatic amines, but not methylamine or ethylamine. Uses azurin as an electron acceptor to transfer electrons from the reduced tryptophylquinone cofactor. [AZUR_ALCFA] Transfers electrons from cytochrome c551 to cytochrome oxidase. Transfers electrons from the tryptophan tryptophylquinone of the aromatic amine dehydrogenase heterotetramer. [AAUA_ALCFA] Oxidizes primary aromatic amines and, more slowly, some long-chain aliphatic amines, but not methylamine or ethylamine. Uses azurin as an electron acceptor to transfer electrons from the reduced tryptophylquinone cofactor. 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 crystal structure of an electron transfer complex of aromatic amine dehydrogenase (AADH) and azurin is presented. Electrons are transferred from the tryptophan tryptophylquinone (TTQ) cofactor of AADH to the type I copper of the cupredoxin azurin. This structure is compared with the complex of the TTQ-containing methylamine dehydrogenase (MADH) and the cupredoxin amicyanin. Despite significant similarities between the two quinoproteins and the two cupredoxins, each is specific for its respective partner and the ionic strength dependence and magnitude of the binding constant for each complex are quite different. The AADH-azurin interface is largely hydrophobic, covering approximately 500 A(2) of surface on each molecule, with one direct hydrogen bond linking them. The closest distance from TTQ to copper is 12.6 A compared with a distance of 9.3 A in the MADH-amicyanin complex. When the MADH-amicyanin complex is aligned with the AADH-azurin complex, the amicyanin lies on top of the azurin but is oriented quite differently. Although the copper atoms differ in position by approximately 4.7 A, the amicyanin bound to MADH appears to be rotated approximately 90 degrees from its aligned position with azurin. Comparison of the structures of the two complexes identifies features of the interface that dictate the specificity of the protein-protein interaction and determine the rate of interprotein electron transfer. Crystal structure of an electron transfer complex between aromatic amine dehydrogenase and azurin from Alcaligenes faecalis.,Sukumar N, Chen ZW, Ferrari D, Merli A, Rossi GL, Bellamy HD, Chistoserdov A, Davidson VL, Mathews FS Biochemistry. 2006 Nov 14;45(45):13500-10. PMID:17087503 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Aromatic amine dehydrogenase 3D structures Azurin 3D structures

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