摘要:
Disclosed is a recombinant thermostable enzyme which has a molecular weight of about 54,000-64,000 daltons and a pI of about 5.6-6.6, and releases trehalose from non-reducing saccharides having a trehalose structure as an end unit and a degree of glucose polymerization of at least 3. The enzyme has a satisfactorily-high thermostability, i.e. it is not substantially inactivated even when incubated in an aqueous solution (pH 7.0) at 85.degree. C. for 60 min, and this facilitates the production of trehalose on an industial scale and in a satisfactorily-high yield.
摘要:
Provided herein are methods of producing and processing a feedstock from a photosynthetic microorganism. Also provided are various transgenic photosynthetic microorganism and photobioreactors for use in the methods.
摘要:
Disclosed is a recombinant thermostable enzyme which has a molecular weight of about 54,000-64,000 daltons and a pI of about 5.6-6.6, and releases trehalose from non-reducing saccharides having a trehalose structure as an end unit and a degree of glucose polymerization of at least 3. The enzyme has a satisfactorily-high thermostability, i.e. it is not substantially inactivated even when incubated in an aqueous solution (pH 7.0) at 85° C. for 60 min, and this facilitates the production of trehalose on an industrial scale and in a satisfactorily-high yield.
摘要:
The present invention relates to trehalose phosphorylases which are useful for the industrial production of trehalose-analogues and glycosyl phosphates. More specifically, the invention discloses trehalose phosphorylases which are mutated in specific amino acid regions. These specific mutations result in modified substrate specificities of the enzymes. In addition, the present invention discloses a wild type trehalose phosphorylase from the marine organism Caldanaerobacter subterraneus, and mutated types thereof, which are highly thermostable and have a broad acceptor and donor specificity.
摘要:
A novel recombinant trehalose phosphorylase is provided. A gene encoding trehalose phosphorylase has been discovered. A vector containing the gene is constructed, a transformant is prepared, and recombinant trehalose phosphorylase is produced using the transformant. Trehalose phosphorylase can be produced in an industrial scale. Trehalose can be manufactured advantageously in an industry scale from D-glucose and null-D-glucose 1-phosphoric acid using this enzyme.
摘要:
The present invention relates to a method for producing trehalose, comprising the steps of mixing and reacting, in any order, (i) at least one alpha-phosphorylase capable of catalyzing the production of alpha-D-glucose 1-phosphate intermediate from a saccharide raw material, and from at least one phosphorus source; (ii) at least one trehalose phosphorylase capable of catalyzing the production of trehalose from an alpha-D-glucose 1-phosphate intermediate and a glucose substrate, wherein the trehalose phosphorylase is a trehalose phosphorylase variant with an amino acid sequence which differs from the amino acid sequence of a wild type trehalose phosphorylase in at least one amino acid position, (iii) at least one saccharide raw material which produces an alpha-D-glucose 1-phosphate intermediate and a co-product by catalytic action of the alpha-phosphorylase; and (iv) at least one phosphorus source selected from the group consisting of a phosphoric acids and an inorganic salt thereof.
摘要:
The present invention relates to trehalose phosphorylases which are useful for the industrial production of trehalose-analogs and glycosyl phosphates. More specifically, the invention discloses trehalose phosphorylases which are mutated in specific amino acid regions. These specific mutations result in modified substrate specificities of the enzymes. In addition, the present invention discloses a wild type trehalose phosphorylase from the marine organism Caldanaerobacter subterraneus, and mutated types thereof, which are highly thermostable and have a broad acceptor and donor specificity.
摘要:
Disclosed is a recombinant thermostable enzyme which has a molecular weight of about 54,000-64,000 daltons and a pI of about 5.6-6.6, and releases trehalose from non-reducing saccharides having a trehalose structure as an end unit and a degree of glucose polymerization of at least 3. The enzyme has a satisfactorily-high thermostability, i.e. it is not substantially inactivated even when incubated in an aqueous solution (pH 7.0) at 85.degree. C. for 60 min, and this facilitates the production of trehalose on an industrial scale and in a satisfactorily-high yield.