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Annals of Microbiology

, 57:623 | Cite as

Cloning and expression of a mannanase gene fromErwinia carotovora CXJZ95-198

  • Yunxiong Zhang
  • Zhengchu Liu
  • Xinbo Chen
Molecular Biology Original Article

Abstract

A gene encoding a mannanase (ManA) was cloned from the genomic library ofErwinia carotovora CXJZ95-198 and expressed inEscherichia coli cells. A 1783 bp DNA fragment containing amanA gene was sequenced. An open reading frame (ORF) of 1137 bp encoded a protein of 378 amino acids. The expressed enzyme had a molecular mass of approximately 42 KD determined by SDS-PAGE. The optimal pH and temperature for the expressed enzyme was 7.5 and 55 °C, respectively. The nucleotide sequence ofmanA had remarkably low homology with other sequences reported. No typical promoter was found but a palindrome sequence existed downstream of the stop codon. The deduced amino acid sequence from mature ManA showed homology of about 53% with those fromBacillus sp., but much lower homology with those from other strains. The ManA was presumably classified as family 26 of glycosidases. It was also clarified that the 1.3 kb fragment up the locus nt 4449729 ofErwinia carotovora genomic DNA was a mannanase gene.

Key words

cloning Erwinia carotovora expression gene location mannanase gene 

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Copyright information

© University of Milan and Springer 2007

Authors and Affiliations

  1. 1.College of Chemistry and Environmental EngineeringChangsha University of Science and TechnologyChangsha, HunanChina
  2. 2.Institute of Bast Fibre CropsCAASChangsha, HunanChina

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