Regulation of Chitinase Production by the 5'-Untranslated Region of the <i>ybfM</i> in <i>Serratia marcescens</i> 2170

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  • TORATANI Tadayuki
    Graduate School of Science and Technology, Niigata University Graduate School of Science and Technology, Niigata University
  • SUZUKI Kazushi
    Graduate School of Science and Technology, Niigata University Department of Applied Biological Chemistry, Faculty of Agriculture, Niigata University Graduate School of Science and Technology, Niigata University Department of Applied Biological Chemistry, Faculty of Agriculture, Niigata University
  • SHIMIZU Mari
    Graduate School of Science and Technology, Niigata University Graduate School of Science and Technology, Niigata University
  • SUGIMOTO Hayuki
    Graduate School of Science and Technology, Niigata University Department of Applied Biological Chemistry, Faculty of Agriculture, Niigata University Graduate School of Science and Technology, Niigata University Department of Applied Biological Chemistry, Faculty of Agriculture, Niigata University
  • WATANABE Takeshi
    Graduate School of Science and Technology, Niigata University Department of Applied Biological Chemistry, Faculty of Agriculture, Niigata University Graduate School of Science and Technology, Niigata University Department of Applied Biological Chemistry, Faculty of Agriculture, Niigata University

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  • Regulation of Chitinase Production by the 5'-Untranslated Region of the ybfM in Serratia marcescens 2170
  • Regulation of chitinase production by the 5′-untranslated region of the ybfM in Serratia marcescens 2170

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Abstract

Serratia marcescens 2170 produces three chitinases and the chitin-binding protein CBP21, and efficiently degrades insoluble and crystalline chitin. The three chitinases and CBP21 are induced by N,N'-diacetylchitobiose [(GlcNAc)2], the major product of chitin hydrolysis by S. marcescens chitinases. We have found that uptake of both (GlcNAc)2 and N-acetylglucosamine (GlcNAc) is important for the efficient utilization of (GlcNAc)2 because (GlcNAc)2 is less efficiently fermented by S. marcescens 2170 in the absence of chitobiase. In order to determine the mechanism of utilization of the degradation products of chitin by S. marcescens, chitobiase deficient transposon mutants were screened. A transposon present in chitobiase-deficient mutants was inserted into the ybfMN-ctb cluster. The mutants produced chitinases, except for TT327, in which a transposon was inserted into the 5'-untranslated region (5'-UTR) of ybfM. Ectopic expression of this region in TT327 restored chitinase production. These results indicate that the 5'-UTR of ybfM is important for chitinase induction in S. marcescens.

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