Characterization and genomic analysis of chromate resistant and reducing Bacillus cereus strain SJ1

BMC Microbiology

Research Article

Susan J Miller¹  Christopher Rensing²  Gejiao Wang³  Liang Guo³  Xiangyang Li³  Minyan He⁴ 

[1] Biotechnology Computing Facility, Arizona Research Laboratories, The University of Arizona, 85721, Tucson, AZ, USA;Department of Soil, Water and Environmental Science, The University of Arizona, 85721, Tucson, AZ, USA;State Key Laboratory of Agricultural Microbiology, College of Life Science and Technology, Huazhong Agricultural University, 430070, Wuhan, China;State Key Laboratory of Agricultural Microbiology, College of Life Science and Technology, Huazhong Agricultural University, 430070, Wuhan, China;Department of Soil, Water and Environmental Science, The University of Arizona, 85721, Tucson, AZ, USA;

关键词: Horizontal Gene Transfer;    K2CrO4;    Horizontal Gene Transfer Event;    Chromate Reduction;    Arsenic Resistance;   

DOI  :  10.1186/1471-2180-10-221

 received in 2010-04-15, accepted in 2010-08-19,  发布年份 2010

来源: Springer

【 摘 要 】

BackgroundChromium is a toxic heavy metal, which primarily exists in two inorganic forms, Cr(VI) and Cr(III). Chromate [Cr(VI)] is carcinogenic, mutational, and teratogenic due to its strong oxidizing nature. Biotransformation of Cr(VI) to less-toxic Cr(III) by chromate-resistant and reducing bacteria has offered an ecological and economical option for chromate detoxification and bioremediation. However, knowledge of the genetic determinants for chromate resistance and reduction has been limited so far. Our main aim was to investigate chromate resistance and reduction by Bacillus cereus SJ1, and to further study the underlying mechanisms at the molecular level using the obtained genome sequence.ResultsBacillus cereus SJ1 isolated from chromium-contaminated wastewater of a metal electroplating factory displayed high Cr(VI) resistance with a minimal inhibitory concentration (MIC) of 30 mM when induced with Cr(VI). A complete bacterial reduction of 1 mM Cr(VI) was achieved within 57 h. By genome sequence analysis, a putative chromate transport operon, chrIA 1, and two additional chrA genes encoding putative chromate transporters that likely confer chromate resistance were identified. Furthermore, we also found an azoreductase gene azoR and four nitroreductase genes nitR possibly involved in chromate reduction. Using reverse transcription PCR (RT-PCR) technology, it was shown that expression of adjacent genes chrA 1 and chrI was induced in response to Cr(VI) but expression of the other two chromate transporter genes chrA 2 and chrA 3 was constitutive. In contrast, chromate reduction was constitutive in both phenotypic and gene expression analyses. The presence of a resolvase gene upstream of chrIA 1, an arsenic resistance operon and a gene encoding Tn7-like transposition proteins ABBCCCD downstream of chrIA 1 in B. cereus SJ1 implied the possibility of recent horizontal gene transfer.ConclusionOur results indicate that expression of the chromate transporter gene chrA 1 was inducible by Cr(VI) and most likely regulated by the putative transcriptional regulator ChrI. The bacterial Cr(VI)-resistant level was also inducible. The presence of an adjacent arsenic resistance gene cluster nearby the chrIA 1 suggested that strong selective pressure by chromium and arsenic could cause bacterial horizontal gene transfer. Such events may favor the survival and increase the resistance level of B. cereus SJ1.

【 授权许可】

Unknown   
© He et al; licensee BioMed Central Ltd. 2010. This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.