期刊
EXTREMOPHILES
卷 14, 期 2, 页码 171-183出版社
SPRINGER JAPAN KK
DOI: 10.1007/s00792-009-0296-5
关键词
Cold adaptation; capB; Antarctic microorganism; Pseudomonas 30/3; Immunolocalization
资金
- UAB Faculty Development
- Department of Biology
- Foundation of Research, Science and Technology, New Zealand [C09X0018]
The analysis of the cold-shock domain (CSD)-encoding genes, capB and cspA, by PCR amplification showed presence of capB in all 18 Antarctic Pseudomonas isolates, but the absence of cspA. Nucleotide sequence analysis of capB ORF from a biodegradative Pseudomonas 30/3 and its regulatory sequences including the promoter and 5'-UTR was determined and compared with the other CSD-encoding genes. Expression analysis using translational gene fusion of the putative capB promoter and its flanking sequence from Pseudomonas sp. 30/3 with lacZ' exhibited a significant increase in beta-galactosidase activity at 15 and 6A degrees C. Unlike the expression of E. coli CspA, Pseudomonas sp. 30/3 showed a slow but steady increase of the CapB expression at 6A degrees C. Subcellular localization of CapB at 6A degrees C showed accumulation in and around the nucleoid whereas at 22 or 30A degrees C, it was identified around the nucleoid as well as in the cytosol. Our study attempts to elucidate the detailed structure of capB from Pseudomonas 30/3 and the role of 5'UTR in the transcriptional regulation along with the possible role of CapB in transcription and translation suited for the cold adaptation of this bacterium in Antarctic environment.
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