部位特異的変異によるピラノース酸化酵素の色素依存性脱水素酵素活性の向上

IR

Bibliographic Information

Other Title
  • Improvement of dye-mediated dehydrogenase activity of pyranose oxidase by site-directed mutagenesis

Abstract

Pyranose oxidase (EC 1.1.3.10 ; PROD) catalyzes the oxidation of aldopyranoses at the position C‒2 to yield the corresponding 2‒keto-aldoses and H2O2 , using oxygen as an electron acceptor. The enzyme shows broad substrate specificity as well as reactivity for 1,5‒anhydro‒d‒glucitol (1,5‒AG), which is known as a clinical glycemic marker. It is considered that the reactivity of PROD for 1,5‒AG is useful in the development of an amperometric-type biosensor, which is a convenient diagnostic device for selfmonitoring blood glucose (SMBG). However, the levels of dissolved oxygen in blood affect biosensor systems that are equipped with an artificial electron mediator. In the present study, we attempted to develop an O2‒insensitive oxidase that would improve the dye-mediated dehydrogenase activity. We performed site-directed mutagenesis on PROD isolated from basidiomycetous fungus No. 52, which generated 11 mutants. The amino acid substitution Q421A exhibited a significant decrease (8.8% of wild type) in its oxidase activity, whereas it maintained its dehydrogenase activity (67% of wild type). In this study, we characterized PROD mutants from basidiomycetous fungus No. 52, which showed improved dye-mediated dehydrogenase activity.

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Details 詳細情報について

  • CRID
    1050565162804217472
  • NII Article ID
    120005537567
  • ISSN
    21867755
  • Web Site
    https://ousar.lib.okayama-u.ac.jp/53068
  • Text Lang
    ja
  • Article Type
    departmental bulletin paper
  • Data Source
    • IRDB
    • CiNii Articles
    • KAKEN

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