3won

Crystal structure of the DAP BII dipeptide complex III

spinqualitylabelsall models 3won, resolution 1.75Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3won is a 2 chain structure. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: GOL, TYR, VAL, ZN Related: 3woi, 3woj, 3wok, 3wol, 3wom, 3woo, 3wop, 3woq, 3wor Resources: FirstGlance, OCA, RCSB, PDBsum Publication Abstract from PubMed The dipeptidyl aminopeptidase BII (DAP BII) belongs to a serine peptidase family, S46. The amino acid sequence of the catalytic unit of DAP BII exhibits significant similarity to those of clan PA endopeptidases, such as chymotrypsin. However, the molecular mechanism of the exopeptidase activity of family S46 peptidase is unknown. Here, we report crystal structures of DAP BII. DAP BII contains a peptidase domain including a typical double beta-barrel fold and previously unreported alpha-helical domain. The structures of peptide complexes revealed that the alpha-helical domain covers the active-site cleft and the side chain of Asn330 in the domain forms hydrogen bonds with the N-terminus of the bound peptide. These observations indicate that the alpha-helical domain regulates the exopeptidase activity of DAP BII. Because S46 peptidases are not found in mammals, we expect that our study will be useful for the design of specific inhibitors of S46 peptidases from pathogens. S46 peptidases are the first exopeptidases to be members of clan PA.,Sakamoto Y, Suzuki Y, Iizuka I, Tateoka C, Roppongi S, Fujimoto M, Inaka K, Tanaka H, Masaki M, Ohta K, Okada H, Nonaka T, Morikawa Y, Nakamura KT, Ogasawara W, Tanaka N Sci Rep. 2014 May 15;4:4977. doi: 10.1038/srep04977. PMID:24827749 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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