Purification and Characterization of Xylose Isomerase of a Methanol Yeast, Candida boidinii, Which Is Involved in Sorbitol Production from Glucose(Microbilolgy & Fermentation Industry)
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概要
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D-Xylose (xylose) isomerase was extracted from xylose-grown cells of a methanol yeast, Candida boidinii (Kloeckera sp.) No. 2201. The enzyme was purified 70-fold, over the original cell-free extract, wihi a yield of 2.4% in a homogeneous state, as judged on sodium dodecyl sulfatepolyacrylamide gel electrophoresis and high performance liquid chromatography. The molecular weight of the enzyme was determined to be 130,000, the enzyme being composed of two subunits of 65,000. The optimum pH and temperature for activity were 4.5 and 37〜45℃, respectively. The enzyme activity was markedly enhanced by Mn^<2->, Mg^<2+> and Co^<2+>, and the enzyme isomerized aldopentoses and aldohexoses. The Km values for xylose and D-glucose were 5.6×10^<-1>M and 4.1×10^<-1>M, and the V_<max> values were 5.8×10^2 and 3.3×10^2 μmol/min/mg, respectively. NaHAsO_4・7H_2O and NaCN strongly inhibited the activity, but HgCl_2, NaN_3, dithiothreitol, monoiodoacetate and polyols such as D-sorbitol, xylitol and D-mannitol did not inhibit the activity.
- 社団法人日本農芸化学会の論文
- 1988-07-23
著者
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TANI Yoshiki
Research Center for Cell and Tissue Culture, Faculty of Agriculture, Kyoto University
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Vongsuvanlert Vitchuporn
Research Center For Cell And Tissue Culture Faculty Of Agriculture Kyoto University
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Vongsuvanlert Vitchuporn
Research Center For Cell And Tissue Culture Faculty Of Agriculture
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Tani Yoshiki
Research Center For Cell And Tissue Culture Faculty Of Agriculture Kyoto University
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Tani Yoshiki
Research Center For Cell And Tissue Cluture Faculty Of Agriculture Kyoto University
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