title: Novel catalytic mechanism of glycoside hydrolysis based on the structure of an NAD+/Mn2+ -dependent phospho-alpha-glucosidase from Bacillus subtilis.
abstract: GlvA, a 6-phospho-alpha-glucosidase from Bacillus subtilis, catalyzes the hydrolysis of maltose-6'-phosphate and belongs to glycoside hydrolase family GH4. GH4 enzymes are unique in their requirement for NAD(H) and a divalent metal for activity. We have determined the crystal structure of GlvA in complex with its ligands to 2.05 A resolution. Analyses of the active site architecture, in conjunction with mechanistic studies and precedent from the nucleotide diphosphate hexose dehydratases and other systems, suggest a novel mechanism of glycoside hydrolysis by GlvA that involves both the NAD(H) and the metal.
authors.affiliation: Molecular Pharmacology and Biological Chemistry, Feinberg School of Medicine, Northwestern University, Chicago, IL 60611, USA.
authors.forename: Shyamala S
authors.initials: SS
authors.lastname: Rajan
authors.forename: Xiaojing
authors.initials: X
authors.lastname: Yang
authors.forename: Frank
authors.initials: F
authors.lastname: Collart
authors.forename: Vivian L Y
authors.initials: VL
authors.lastname: Yip
authors.forename: Stephen G
authors.initials: SG
authors.lastname: Withers
authors.forename: Annabelle
authors.initials: A
authors.lastname: Varrot
authors.forename: John
authors.initials: J
authors.lastname: Thompson
authors.forename: Gideon J
authors.initials: GJ
authors.lastname: Davies
authors.forename: Wayne F
authors.initials: WF
authors.lastname: Anderson
mesh_terms: D000595:Amino Acid Sequence; D001412:Bacillus subtilis / Q000201:enzymology*; D001426:Bacterial Proteins / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism; D001665:Binding Sites; D018360:Crystallography, X-Ray; D006027:Glycosides / Q000378:metabolism*; D007770:L-Lactate Dehydrogenase / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D008345:Manganese / Q000378:metabolism*; D008958:Models, Molecular; D008969:Molecular Sequence Data; D015394:Molecular Structure; D009243:NAD / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism*; D011487:Protein Conformation; D011994:Recombinant Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D016415:Sequence Alignment; D013379:Substrate Specificity; D000520:alpha-Glucosidases / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism
chemical_list: D001426:Bacterial Proteins; D006027:Glycosides; D011994:Recombinant Proteins; D009243:NAD; D008345:Manganese; D007770:L-Lactate Dehydrogenase; C049150:maltose-6'-phosphate glucosidase; D000520:alpha-Glucosidases