title: One-Pot Biosynthesis of High-Concentration α-Glucose 1-Phosphate from Starch by Sequential Addition of Three Hyperthermophilic Enzymes.
abstract: α-Glucose 1-phosphate (G1P) is synthesized from 5% (w/v) corn starch and 1 M phosphate mediated by α-glucan phosphorylase (αGP) from the thermophilic bacterium Thermotoga maritima at pH 7.2 and 70 °C. To increase G1P yield from corn starch containing branched amylopectin, a hyper-thermostable isoamylase from Sulfolobus tokodaii was added for simultaneous starch gelatinization and starch-debranching hydrolysis at 85 °C and pH 5.5 before αGP use. The pretreatment of isoamylase increased G1P titer from 120 mM to 170 mM. To increase maltose and maltotriose utilization, the third thermostable enzyme, 4-glucanotransferase (4GT) from Thermococcus litoralis, was added during the late stage of G1P biotransformation, further increasing G1P titer to 200 mM. This titer is the highest G1P level obtained on starch or its derived products (maltodextrin and soluble starch). This study suggests that in vitro multienzyme biotransformation has an advantage of great engineering flexibility in terms of space and time compared with microbial fermentation.
authors.affiliation: Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences , 32 West Seventh Avenue, Tianjin Airport Economic Area, Tianjin 300308, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Zhou
authors.affiliation: Cell Free Bioinnovations Inc. , 1800 Kraft Drive, Suite 222, Blacksburg, Virginia 24060, United States.
authors.forename: Chun
authors.initials: C
authors.lastname: You
authors.affiliation: Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences , 32 West Seventh Avenue, Tianjin Airport Economic Area, Tianjin 300308, China.
authors.forename: Hongwu
authors.initials: H
authors.lastname: Ma
authors.affiliation: Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences , 32 West Seventh Avenue, Tianjin Airport Economic Area, Tianjin 300308, China.
authors.forename: Yanhe
authors.initials: Y
authors.lastname: Ma
authors.affiliation: Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences , 32 West Seventh Avenue, Tianjin Airport Economic Area, Tianjin 300308, China.|Cell Free Bioinnovations Inc. , 1800 Kraft Drive, Suite 222, Blacksburg, Virginia 24060, United States.|Biological Systems Engineering Department, Virginia Tech , 304 Seitz Hall, Blacksburg, Virginia 24061, United States.
authors.forename: Y-H Percival
authors.initials: YH
authors.lastname: Zhang
mesh_terms: D019843:Archaeal Proteins / Q000737:chemistry*; D001426:Bacterial Proteins / Q000737:chemistry*; D055162:Biocatalysis; D005958:Glucosephosphates / Q000737:chemistry*; D005964:Glucosyltransferases / Q000737:chemistry*; D006358:Hot Temperature; D006863:Hydrogen-Ion Concentration; D007517:Isoamylase / Q000737:chemistry*; D006005:Phosphorylases / Q000737:chemistry*; D013213:Starch / Q000737:chemistry*; D016944:Sulfolobus / Q000737:chemistry / Q000201:enzymology; D019712:Thermococcus / Q000737:chemistry / Q000201:enzymology; D020124:Thermotoga maritima / Q000737:chemistry / Q000201:enzymology
chemical_list: D019843:Archaeal Proteins; D001426:Bacterial Proteins; D005958:Glucosephosphates; D013213:Starch; C031590:glucose-1-phosphate; D005964:Glucosyltransferases; D006005:Phosphorylases; D007517:Isoamylase
keywords: 4-glucanotransferase; cascade enzyme biocatalysis; enzyme cocktail; isoamylase; α-glucan phosphorylase; α-glucose 1-phosphate