title: Crystal structure of GH13 alpha-glucosidase GSJ from one of the deepest sea bacteria.
abstract: The crystal structure of the GH13 alpha-glucosidase (GSJ) from deep-sea bacterium Geobacillus sp. strain HTA-462 was determined to a 2.0 A resolution. Comparisons of the GSJ structure with that of other GH13 enzymes with different catalytic activities revealed that the catalytic cleft of GSJ was widely opened when compared with the homologues. The wide opening of the catalytic cleft originated from conformational changes of active site residues and disorder of the regions close to the catalytic center. This structural feature of GSJ would explain the ability of this enzyme to accept a wide variety of nonsugar molecules as acceptors in the transglycosylation reaction.
authors.affiliation: Department of Bioscience, Nagahama Institute of Bioscience and Technology, 1266 Tamura, Nagahama 526-0829, Japan. t_shirai@nagahama-i-bio.ac.jp
authors.forename: Tsuyoshi
authors.initials: T
authors.lastname: Shirai
authors.forename: Vo Si
authors.initials: VS
authors.lastname: Hung
authors.forename: Katsuhito
authors.initials: K
authors.lastname: Morinaka
authors.forename: Tohru
authors.initials: T
authors.lastname: Kobayashi
authors.forename: Susumu
authors.initials: S
authors.lastname: Ito
mesh_terms: D001407:Bacillus / Q000201:enzymology*; D020134:Catalytic Domain; D018360:Crystallography, X-Ray; D015394:Molecular Structure; D011487:Protein Conformation; D020836:Protein Structure, Quaternary; D011994:Recombinant Proteins / Q000737:chemistry; D012623:Seawater / Q000382:microbiology*; D000520:alpha-Glucosidases / Q000737:chemistry*
chemical_list: D011994:Recombinant Proteins; D000520:alpha-Glucosidases