title: Highly alkaline pectate lyase Pel-4A from alkaliphilic Bacillus sp. strain P-4-N: its catalytic properties and deduced amino acid sequence.
abstract: The gene for a highly alkaline pectate lyase, Pel-4A, from alkaliphilic Bacillus sp. strain P-4-N was cloned, sequenced, and overexpressed in Bacillus subtilis cells. The deduced amino acid sequence of the mature enzyme (318 amino acids, 34805 Da) showed moderate homology to those of known pectate lyases in the polysaccharide lyase family 1. The purified recombinant enzyme had an isoelectric point of pH 9.7 and a molecular mass of 34 kDa, and exhibited a very high specific activity compared with known pectate lyases reported so far. The enzyme activity was stimulated 1.6 fold by addition of NaCl at an optimum of 100 mM. When Pel-4A was stored at 50 degrees C for 60 h, striking stabilization by 100 mM NaCl was observed in a pH range from 5 to 11.5, whereas it was stable only around pH 11 in the absence of NaCl.
authors.affiliation: Tochigi Research Laboratories, Kao Corporation, Haga, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Kobayashi
authors.forename: Y
authors.initials: Y
authors.lastname: Hatada
authors.forename: A
authors.initials: A
authors.lastname: Suzumatsu
authors.forename: K
authors.initials: K
authors.lastname: Saeki
authors.forename: Y
authors.initials: Y
authors.lastname: Hakamada
authors.forename: S
authors.initials: S
authors.lastname: Ito
mesh_terms: D000595:Amino Acid Sequence; D001407:Bacillus / Q000201:enzymology*; D001483:Base Sequence; D003001:Cloning, Molecular; D004247:DNA; D006863:Hydrogen-Ion Concentration; D008969:Molecular Sequence Data; D008970:Molecular Weight; D011133:Polysaccharide-Lyases / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D011994:Recombinant Proteins / Q000737:chemistry / Q000235:genetics; D017386:Sequence Homology, Amino Acid; D013379:Substrate Specificity; D013696:Temperature
chemical_list: D011994:Recombinant Proteins; D004247:DNA; D011133:Polysaccharide-Lyases; C023911:pectate lyase