Bacteria and enzymes for production of alternant fragments
    15.
    发明授权
    Bacteria and enzymes for production of alternant fragments 失效
    用于生产交替糖片段的细菌和酶

    公开(公告)号:US5888776A

    公开(公告)日:1999-03-30

    申请号:US98886

    申请日:1998-06-17

    摘要: A new enzyme, alternanase, which is effective for the endo-hydrolytic cleavage of alternan, producing a thinned composition of low molecular weight fractions which exhibit reduced viscosity and increased solubility relative to native alternan, is described. The enzyme is produced and secreted extracellularly by a plurality of novel bacteria isolated from soil. One of the fractions present in the thinned alternan resulting from hydrolysis with alternanase is a the cyclic tetrasaccharide, cyclo{-6)-.alpha.-D-Glcp-(1,3)-.alpha.-D-Glcp-(1,6)-.alpha.-D-Glcp-(1,3)-.alpha.-D-Glcp-(1-}. A novel method for isolating strains of microorganisms which produce endo-.alpha.-D-glucanases such as alternanase effective for the endo-hydrolytic cleavage or thinning of alternan is also described. Cultures of the subject strains are contacted with a test substrate of alternan coupled to a detectable indicator. Detection of released indicator provides an indication of endo-.alpha.-D-glucanase activity.

    摘要翻译: 描述了一种对交替糖内切水解有效的新型酶,交替糖酶,产生相对于天然交替糖显示出降低的粘度和增加的溶解度的低分子量级分的变薄的组合物。 通过从土壤分离的多种新型细菌在细胞外产生和分泌酶。 由交替糖酶水解产生的稀释的交替糖中存在的部分之一是环状四糖,环{-6)-β-D-Glcp-(1,3)-β-D-Glcp-(1,6) - α-D-Glcp-(1,3)-a-D-Glcp-(1-}。一种分离产生内源α-D-葡聚糖酶的微生物菌株的新方法,例如有效用于内切酶裂解的交替糖酶 还描述了交替糖的稀释,将受试菌株的培养物与偶联到可检测指示物的交替糖的测试底物接触。释放的指示剂的检测提供了内源α-D-葡聚糖酶活性的指示。

    Mutanase
    17.
    发明授权
    Mutanase 失效
    转谷氨酰胺酶

    公开(公告)号:US4353891A

    公开(公告)日:1982-10-12

    申请号:US190621

    申请日:1971-10-19

    摘要: This invention relates to a class of .alpha.1,3 glucan 3-glucanohydrolase named mutanase. The .alpha.1,3 glucosidic bonded polysaccharides hydrolyzed by these enzymes, herein termed mutan, forms part of the matrix material of dental plaque.Mutanase may be produced by culturing microorganisms such as, Trichoderma, Penicillium, or Streptococcus on a glucan characterized by at least 50% alpha -1, 3 glucosidic bonds.Mutanase containing compositions are adapted for disintegrating in vivo essential structural components of dental plaque.

    摘要翻译: 本发明涉及一类称为齿斑葡聚糖酶的α1,3葡聚糖3-葡聚糖水解酶。 由这些酶水解的α1,3糖苷键合的多糖,这里称为mutan,形成牙斑基质材料的一部分。 变种酶可以通过以特征在于至少50%的α-1,3-糖苷键的葡聚糖培养微生物如木霉属,青霉属或链球菌来产生。 含有变种酶的组合物适于在体内分解牙菌斑的基本结构组分。