The β-1,3-exoglucanase gene exgA (exg1) of aspergillus oryzae is required to catabolize extracellular glucan, and is induced in growth on a solid surface

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  • TAMANO Koichi
    Research Institute for Cell Engineering, National Institute of Advanced Industrial Science and Technology (AIST)
  • SATOH Yuki
    Research Institute for Cell Engineering, National Institute of Advanced Industrial Science and Technology (AIST)
  • ISHII Tomoko
    Research Institute for Cell Engineering, National Institute of Advanced Industrial Science and Technology (AIST)
  • TERABAYASHI Yasunobu
    Research Institute for Cell Engineering, National Institute of Advanced Industrial Science and Technology (AIST)
  • OHTAKI Shinsaku
    Laboratory of Molecular Enzymology, Division of Life Science, Graduate School of Agricultural Science, Tohoku University
  • SANO Motoaki
    Genome Biotechnology Laboratory, Kanazawa Institute of Technology
  • TAKAHASHI Tadashi
    Noda Institute for Scientific Research
  • KOYAMA Yasuji
    Noda Institute for Scientific Research
  • MIZUTANI Osamu
    Laboratory of Molecular Enzymology, Division of Life Science, Graduate School of Agricultural Science, Tohoku University
  • ABE Keietsu
    Laboratory of Molecular Enzymology, Division of Life Science, Graduate School of Agricultural Science, Tohoku University
  • MACHIDA Masayuki
    Research Institute for Cell Engineering, National Institute of Advanced Industrial Science and Technology (AIST)

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タイトル別名
  • The .BETA.-1,3-Exoglucanase Gene exgA (exg1) of Aspergillus oryzae Is Required to Catabolize Extracellular Glucan, and Is Induced in Growth on a Solid Surface
  • The ベータ 1 3 exoglucanase gene exgA exg1 of aspergillus oryzae is required to catabolize extracellular glucan and is induced in growth on a solid surface
  • The β-1,3-Exoglucanase Gene<i>exgA</i>(<i>exg1</i>) of<i>Aspergillus oryzae</i>Is Required to Catabolize Extracellular Glucan, and Is Induced in Growth on a Solid Surface

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抄録

The biological role of ExgA (Exg1), a secretory β-1,3-exoglucanase of Aspergillus oryzae, and the expression pattern of the exgA (exg1) gene were analyzed. The exgA disruptant and the exgA-overexpressing mutant were constructed, and phenotypes of both mutants were compared. Higher mycelial growth rate and conidiation efficiency were observed for the exgA-overexpressing mutant than for the exgA disruptant when β-1,3-glucan was supplied as sole carbon source. On the other hand, no difference in phenotype was observed between them in the presence or absence of the inhibitors of cell wall β-glucan remodeling when grown with glucose. exgA Expression was induced in growth on solid surfaces such as filter membrane and onion inner skin. A combination of poor nutrition and mycelial attachment to a hydrophobic solid surface appears to be an inducing factor for exgA expression. These data suggest that ExgA plays a role in β-glucan utilization, but is not much involved in cell wall β-glucan remodeling.

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