Isolation and identification of two xylanase-producing extremely alkali-tolerant strains of Bacillus halodurans from Turpan in China

Wei Sheng Wu Xue Bao. 2006 Dec;46(6):951-5.

Abstract

Bacillus halodurans XJU-1 and XJU-80 were characterized in terms of physiological and biochemical characteristics, and 16S rDNA sequence homology and DNA-DNA hybridization analysis. The two isolates can grow in nutrient broth at a broad range of pH values from 4.5 to 12.6 for XJU-1 and from 3.8 to 12.8 for XJU-80, respectively. And the optimum temperature of growth were around 39 degrees C and 42 degrees C, respectively. Phylogenetic analysis of the two strains based on comparison of 16S rRNA sequence revealed that they are closely related to Bacillus halodurans C-125 and DSM497Twith 99% identity. DNA-DNA hybridization showed that the highest levels of DNA-DNA relatedness were found between the two strains (85%) and the B. halodurans type strains (81.3% and 71.5%), respectively. Moreover, the G + C content of the genomic DNA was 40.5 mol% for XJU-1 and 42.2 mol% for XJU-80.Our results demonstrate that strains XJU-1 and XJU-80 should be classified as two new members of the species B. halodurans.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Bacillus / classification
  • Bacillus / enzymology
  • Bacillus / isolation & purification*
  • Bacillus / physiology
  • Endo-1,4-beta Xylanases / biosynthesis*
  • Hydrogen-Ion Concentration
  • Nucleic Acid Hybridization
  • Phylogeny
  • RNA, Ribosomal, 16S / genetics

Substances

  • RNA, Ribosomal, 16S
  • Endo-1,4-beta Xylanases