14307-03-0Relevant articles and documents
Purification and characterization of D-glucosaminitol dehydrogenase from Agrobacterium radiobacter.
Iwamoto,Sakamoto,Tamura,Mikata,Tanaka
, p. 785 - 791 (2007/10/03)
D-Glucosaminitol dehydrogenase, which catalyzes the conversion of D-glucosaminitol to 3-keto-D-glucosaminitol, was purified to apparent homogeneity from extracts of Agrobacterium radiobacter. This organism has constitutively depressed levels of the enzyme but expression of the enzyme is induced by addition of D-glucosamine to the medium. Purification included ammonium sulfate fractionation and chromatography on columns of DEAE-Sephacel, Octyl-Sepharose CL-4B, and Cellulofine. The purified enzyme migrated as a single band, coinciding with dehydrogenase activities specific for D-glucosaminitol and ethanol, when electrophoresed on a 7.5% polyacrylamide gel at pH 8.0. Electrophoresis on a 12.5% PAGE in the presence of 1% SDS also yielded a single band. The enzyme had an apparent molecular mass of 79 kDa, as measured by the pattern of elution from a column of Cellulofine. The results indicated that the enzyme was a dimer of identical (or nearly identical) subunits of 39.5 kDa. D-Glucosaminitol dehydrogenase required NAD+ as a cofactor and used ethanol as the preferred substrate, as well as aliphatic alcohols with 2 to 4 carbon atoms, D-glucosaminitol, D-glucosaminate, DL-allothreonine, glycerol, and erythritol as additional substrates. In 50 mM Tris-HCl buffer (pH 9.0) at 25 degrees C, the K(m) for D-glucosaminitol, ethanol, and NAD+ were 2.2, 2.0, and 0.08 mM, respectively. The enzyme had a pH optimum of 10 for D-glucosaminitol and 8.5 for ethanol. The enzyme lost substantial activity when treated with pyrazole, with certain reagents that react with sulfhydryl groups and with Zn2+ ion. The various results together suggest that the enzyme exploits different amino acid residues for the dehydrogenation of ethanol and of D-glucosaminitol.
Isolation of 2-Amino-2-deoxy-D-mannitol from Culture Broth of Streptomyces species
Ezure, Yohji,Maruo, Shigeaki,Miyazaki, Katsunori,Seto, Takashi,Yamada, Naoyoshi,et al.
, p. 1421 - 1422 (2007/10/02)
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NEW SIMPLE SYNTHESIS OF 2-ACETAMIDO-2-DEOXY-β-D-GLUCOPYRANOSYLAMINE AND 2-ACETAMIDO-4-O-(2-ACETAMIDO-2-DEOXY-β-D-GLUCOPYRANOSYL)-2-DEOXY-β-D-GLUCOPYRANOSYLAMINE AND PREPARATION OF THEIR N-ACYL DERIVATIVES
Likhosherstov, L. M.,Novikova, O. S.,Derevitskaya, V. A.,Kochetkov, N. K.
, p. 1512 - 1517 (2007/10/02)
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