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Desulfurization of dibenzothiophene by Bacillus subtilis recombinants carrying dszABC and dszD genes.

Authors
  • Ma, Ting
  • Li, Guoqiang
  • Li, Jian
  • Liang, Fenglai
  • Liu, Rulin
Type
Published Article
Journal
Biotechnology letters
Publication Date
Jul 01, 2006
Volume
28
Issue
14
Pages
1095–1100
Identifiers
PMID: 16810451
Source
Medline
License
Unknown

Abstract

The desulfurization (dsz) genes from Rhodococcus erythropolis DS-3 were successfully integrated into the chromosomes of Bacillus subtilis ATCC 21332 and UV1 using an integration vector pDGSDN, yielding two recombinant strains, B. subtilis M29 and M28 in which the integrated dsz genes were expressed efficiently under the promoter, Pspac. The dibenzothiophene (DBT) desulfurization efficiency of M29 was 16.2 mg DBT l(-1) h(-1) at 36 h, significantly higher than that of R. erythropolis DS-3 and B. subtilis M28 and also showed no product inhibition. The interfacial tension of the supernatant fermented by M29 varied from 48 mN m(-1) to 4.2 mN m(-1), lower than that of the recombinant strain, M28, reveals that the biosurfactant secreted from M29 may have an important function in the DBT desulfurization process.

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