Molecular cloning and structural analysis of the gene encoding Bacillus cereus exochitinase Chi36

Shu Yi Wang, Shaw Jye Wu, George Thottappilly, Robert D. Locy, Narendra K. Singh

Research output: Contribution to journalArticlepeer-review

22 Scopus citations

Abstract

The chi36 gene encoding exochitinase Chi36 was cloned from a Bacillus cereus 6E1 subgenomic library. The chi36 open reading frame is 1080 bp long encoding a Chi36 precursor protein of 360 amino acids, consisting of a 27 amino acid N-terminal signal peptide and a 333 amino acid sequence found in the mature Chi36 protein of 36.346 kDa. Chi36 shows significant amino acid sequence similarity to many bacterial chitinases, but has highest similarity to B. circulans WL-12 chitinase D. Chi36 belongs to subfamily B of bacterial chitinases in family 18 of glycosyl hydrolases. Chi36 shows a simple and compact structural organization composed of an N-terminal signal peptide and a C-terminal (β/α)8-barrel catalytic domain (CaD). The Chi36 signal peptide is recognized by Escherichia coli, allowing Chi36 secretion. Chi36 is the first one-domain (CaD) bacterial chitinase cloned from B. cereus.

Original languageEnglish
Pages (from-to)59-66
Number of pages8
JournalJournal of Bioscience and Bioengineering
Volume92
Issue number1
DOIs
StatePublished - 2001

Keywords

  • Bacillus cereus
  • Chi36
  • Chitinase
  • Glycosyl hydrolase
  • Secretion

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