2amg | pdb_00002amg

STRUCTURE OF HYDROLASE (GLYCOSIDASE)

spinqualitylabelsall models 2amg, resolution 2.00Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2amg is a 1 chain structure with sequence from Pseudomonas stutzeri. This structure supersedes the now removed PDB entry 1amg. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: CA Activity: Glucan 1,4-alpha-maltotetraohydrolase, with EC number 3.2.1.60 Resources: FirstGlance, OCA, PDBe, 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 The three-dimensional structure of an exo-type alpha-amylase from Pseudomonas stutzeri which degrades starch from its non-reducing end to produce maltotetraose has been determined by X-ray structure analysis. The catalytic domain of this enzyme (G4-2), whose structure was determined, is a product of spontaneous limited proteolysis in culture broth. It has 429 amino acid residues and a molecular mass of 47,200, and crystallizes in ammonium sulfate solution at pH 7.5. The structure was elucidated by the multiple isomorphous replacement method and refined at 2.0 A resolution, resulting in a final R-factor of 0.178 for significant reflections with a root-mean-square deviation from ideality in bond distances of 0.013 A. The polypeptide chain of this molecule folds into three domains; the first with a (beta/alpha)8 barrel structure, the second with an excursed part from the first one, and the third with five-stranded antiparallel beta-sheets. The active cleft is formed on the C-terminal side of the beta-sheets in the (beta/alpha)8 barrel as in the known endo-type alpha-amylases. A histidine side-chain nitrogen ND1 is coordinated to one of the bound calcium ion. The recognition site of the non-reducing end of the amylose that determines exo-wise degradation is presumed to be at one end of this cleft where there is a disordered loop consisting of the 66th to 72nd residues, and a loop carrying an aspartic acid (Asp160). These structural features may be responsible for the binding of the non-reducing end of the substrate amylose. Crystal structure of a maltotetraose-forming exo-amylase from Pseudomonas stutzeri.,Morishita Y, Hasegawa K, Matsuura Y, Katsube Y, Kubota M, Sakai S J Mol Biol. 1997 Apr 4;267(3):661-72. PMID:9126844 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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