Biotechnology and Bioprocess Engineering:BBE

The Korean Society for Biotechnology and Bioengineering (한국생물공학회)
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Molecular Cloning and Characterization of 58 kDa Chitinase Gene from Serratia marcescens KCTC 2172

  • Gal Sang Wan (Department of Microbiological Engineering, Chinju National University) ;
  • Lee S. W. (Department of Microbiological Engineering, Chinju National University) ;
  • Choi Y. J. (Department of Food and Nutrition, Sila University)
  • Published : 2002.01.01
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Abstract

A chitinase gene (pCHi58) encoding a 58 kDa chitinase was isolated from the Serratia marcescens KCTC 2172 cosmid library. The chitinase gene consisted of a 1686 bp open reading frame that encoded 562 amino acids. Escherichia coil harboring the pChi58 gene secreted a 58 kDa chitinase into the culture supernatant. The 58 kDa chitinase was purified using a chitin affinity column and mono-S column. A nucleotide and N-terminal amino acid sequence analysis showed that the 58 kDa chitinase had a leader peptide consisting of 23 amino acids which was cleaved prior to the 24th alanine. The 58 KDa chitinase exhibited a $98\%$ similarity to that of S. marcescens OMB 1466 in its nuclotide sequence. The chitinolytic patterns of the 58 kDa chitinase released N,N'-diacetyl chitobiose (NAG2) as the major hydrolysis end-product with a trace amount of N-acetylglucosamine. When a 4-methylumbellyferyl-N-acetylglucosamin monomer, dimmer, and tetramer were used as substrates, the 58 kDa chitinase did not digest the 4-Mu-NAG monomer $(analogue\;of\;NAG_2)$, thereby indicating that the 58 kDa chitinase was likely an endochitinase. The optimum reaction temperature and pH of the enzyme were $50^{\circ}C$ and 5.0, respectively.

Keywords

References

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