Secondary structure ofStreptococcus downeiGTF-I glucansucrase
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چکیده
منابع مشابه
Secondary and tertiary protein structure I. Hierarchy of protein structure
Four levels in protein structural organization are commonly identified. Primary structure is a sequence of amino acids. Secondary structure is represented by regular local conformations of polypeptide chain, such as α-helix or β-strand. The combinations of two secondary structure elements are also sometimes referred to as secondary (or supersecondary) structure. The example is a β-hairpin forme...
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Glucansucrases of oral streptococci and Leuconostoc mesenteroides are enzymes of medical and biotechnological interest that synthesize alpha-glucans. They can also synthesize oligosaccharides in the presence of a sugar acceptor. Previous reports have identified an amino acid residue that may affect the structure of the glucan product; therefore, random mutagenesis of the corresponding Asp-569 o...
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Lactic acid bacteria (LAB) employ sucrase-type enzymes to convert sucrose into homopolysaccharides consisting of either glucosyl units (glucans) or fructosyl units (fructans). The enzymes involved are labeled glucansucrases (GS) and fructansucrases (FS), respectively. The available molecular, biochemical, and structural information on sucrase genes and enzymes from various LAB and their fructan...
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Glucansucrase (GSase) from Streptococcus mutans is an essential agent in dental caries pathogenesis. Here, we report the crystal structure of S. mutans glycosyltransferase (GTF-SI), which synthesizes soluble and insoluble glucans and is a glycoside hydrolase (GH) family 70 GSase in the free enzyme form and in complex with acarbose and maltose. Resolution of the GTF-SI structure confirmed that t...
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The secondary amine piperidine and the tertiary amine quinuclidine (l-azabicyclo[2.2.2]octane) were reacted in THF with one equivalent of triphenylphosphinegold(I) tetrafluoro borate, [Ph3PAu]+ BF4“, to give the monoaurated ammonium salts of formula [R„NHp_„)AuPPh3]+ BF4~ (n = 2, 3). The compounds were obtained as crystalline solids in good yields, and were characterized by IR and NM R spectro...
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ژورنال
عنوان ژورنال: FEMS Microbiology Letters
سال: 1999
ISSN: 0378-1097,1574-6968
DOI: 10.1111/j.1574-6968.1999.tb13739.x