title: Crystal structure of the alginate (poly alpha-l-guluronate) lyase from Corynebacterium sp. at 1.2 A resolution.
abstract: The crystal structure of alginate (poly alpha-l-guluronate) lyase from Corynebacterium sp. (ALY-1) was determined at 1.2A resolution using the MAD method and bromide ions. The structure of ALY-1 is abundant in beta-strands and has a deep cleft, similar to the jellyroll beta-sandwich found in 1,3-1,4-beta-glucanase. The structure suggests that alginate molecules may penetrate into the cleft to interact with the catalytic site of ALY-1. The reported crystal structure of another type of alginate lyase, A1-III, differs from that of ALY-1 in that it consists almost entirely of alpha-helical structure. Nevertheless, the putative catalytic residues in both enzymes are positioned in space in nearly identical arrangements. This finding suggests that both alginate lyases may have evolved through convergent evolution.
authors.affiliation: Laboratory of Biochemistry, Department of Bioscience and Biotechnology, Faculty of Agriculture, Graduate School, Kyushu University, Fukuoka 812-8581, Japan.
authors.forename: Takuo
authors.initials: T
authors.lastname: Osawa
authors.forename: Yasuhito
authors.initials: Y
authors.lastname: Matsubara
authors.forename: Tsuyoshi
authors.initials: T
authors.lastname: Muramatsu
authors.forename: Makoto
authors.initials: M
authors.lastname: Kimura
authors.forename: Yoshimitsu
authors.initials: Y
authors.lastname: Kakuta
mesh_terms: D000595:Amino Acid Sequence; D001665:Binding Sites; D003352:Corynebacterium / Q000201:enzymology*; D018360:Crystallography, X-Ray; D004791:Enzyme Inhibitors / Q000737:chemistry / Q000494:pharmacology; D008958:Models, Molecular; D008969:Molecular Sequence Data; D011133:Polysaccharide-Lyases / Q000037:antagonists & inhibitors / Q000737:chemistry* / Q000378:metabolism; D011487:Protein Conformation; D016415:Sequence Alignment
chemical_list: D004791:Enzyme Inhibitors; D011133:Polysaccharide-Lyases; C022416:poly-alpha-L-guluronate lyase; C016158:poly(beta-D-mannuronate) lyase