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2 results about "Cyclodextrin glycosyltransferase" patented technology
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Cyclodextrin glycosyl transferase (also Cyclodextrin glucosyltransferase or Cyclodextrin glucanotransferase) or CGTase for short (EC 2.4.1.19) is a bacterial enzyme belonging to the same family of the α-amylase specifically known as glycosyl-hydrolase family 13. This peculiar enzyme is capable of catalyzing more than one reaction with the most important being the synthesis of non-reducing cyclic dextrins known as cyclodextrins starting from starch, amylose, and other polysaccharides. CGTase is an enzyme common to many bacterial species, in particular of the Bacillus genus (e.g. B. circulans, B. macerans and B. stearothermophilus), as well as to some archaea, but it is not known to be present in any other species.
Cyclodextrin glycosyltransferase with enhanced solvent tolerance and preparation thereof
The disclosure discloses a cyclodextrin glycosyltransferase with enhanced solvent tolerance and preparation thereof, belonging to the technical fields of enzyme engineering and genetic engineering. The disclosure constructs four cyclodextrin glycosyltransferase mutants with enhanced organic solvent tolerance. Among them, the mutant with the optimal tolerance to DMSO and methanol is G539I / R146F / D147N, which is 1.6 times and 1.7 times higher than that of WT, respectively; the mutant with the optimal tolerance to ethanol is R146F, which is 1.4 times higher than that of WT; the mutant with the optimal tolerance to acetone is G539I / R146F, which is 1.5 times higher than that of WT. The disclosure helps to expand the application of glycosyltransferases in organic reaction systems, improves the enzymatic efficiency of CGTase on natural hydrophobic substrates, and has great application prospects.
Owner:JIANGNAN UNIV
Preparation method of monascus summer tea
The invention is applicable to the technical field of functional tea drink processing, and provides a preparation method of monascus summer tea, which comprises the following steps: carrying out synergistic pretreatment of pulsed electric field and compound enzymolysis on summer tea; inoculating a compound microbial agent composed of monascus, aspergillus niger and lactobacillus plantarum for fermentation; the synthesis of different metabolites is accurately regulated and controlled by adopting a four-stage dynamic temperature change process; a targeted activator system composed of L-arabinose, vitamin C and betaine is added in a key metabolism window stage; an in-situ enzymatic glycosylation system composed of cyclodextrin glycosyl transferase and sucrose synthase is introduced, and monacolin K and tea polyphenol are modified. According to the invention, pH / temperature dual-response targeted activation, fructo-oligosaccharide synergistic in-situ glycosylation and stable network construction are fused with multi-strain synergistic fermentation and dynamic metabolism regulation for the first time, so that the yield, bioavailability, flavor quality and storage stability of monacolin K in a final product are remarkably improved.
Owner:HANGZHOU TWIN-HORSE BIOENGINEERING CO LTD