title: Desulfurization of dibenzothiophene by Bacillus subtilis recombinants carrying dszABC and dszD genes.
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.
authors.affiliation: College of Environmental Science and Technology, Nankai University, Tianjin, China.
authors.forename: Ting
authors.initials: T
authors.lastname: Ma
authors.forename: Guoqiang
authors.initials: G
authors.lastname: Li
authors.forename: Jian
authors.initials: J
authors.lastname: Li
authors.forename: Fenglai
authors.initials: F
authors.lastname: Liang
authors.forename: Rulin
authors.initials: R
authors.lastname: Liu
mesh_terms: D001412:Bacillus subtilis / Q000502:physiology*; D001426:Bacterial Proteins / Q000235:genetics / Q000378:metabolism*; D001673:Biodegradation, Environmental; D024861:Genetic Enhancement / Q000379:methods; D007220:Industrial Waste / Q000517:prevention & control; D015202:Protein Engineering / Q000379:methods*; D011994:Recombinant Proteins / Q000378:metabolism; D012240:Rhodococcus / Q000235:genetics / Q000378:metabolism*; D013455:Sulfur / Q000302:isolation & purification* / Q000378:metabolism*; D013876:Thiophenes / Q000378:metabolism*; D014162:Transfection / Q000379:methods
chemical_list: D001426:Bacterial Proteins; D007220:Industrial Waste; D011994:Recombinant Proteins; D013876:Thiophenes; D013455:Sulfur; C016366:dibenzothiophene