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KMID : 1161519990030020229
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Animal Cells and Systems
1999 Volume.3 No. 2 p.229 ~ p.236
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Molecular cloning and characterization of a recA-like gene induced by DNA damage from a fluorescent Pseudomonas sp.
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Kim Ok-Bong
Kim Na-Young
Jeong Jae-Hoon
Kim Si-Wouk
Jeong Hye-Gwang
Yoon Seong-Myeong
Park Jong-Kun
Lee Jung-Sup
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Abstract
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The recA gene plays a central role in genetic recombination and SOS DNA repair in Escherichia coli (E. coli). We have previously identified a 42 kDa RecA?like protein inducible by a variety of DNA damages from a fluorescent Pseudomonas strain sp. and characterized its inducible kinetics. In the present study, we cloned and characterized the gene encoding the RecA?like protein by immunological screening of Pseudomonas genomic expression library using polyclonal E. coli anti?RecA antibodies as a probe. From 10 plaques screened, five putative clones were finally isolated. Southern blot analysis indicated that four clones had the same DNA inserts and the recA?like gene was located within the 3.2 kb EcoRI fragment of Pseudomonas chromosomal DNA. In addition, the cloned recA?like gene was transcribed into an RNA transcript approximately 1.1 kb in size, as judged by Northern blot analysis. The cellular level of RNA transcript of the cloned recA?like gene was increased to an average of 5.15? fold upon treatment with DNA damaging agents such as ultraviolet (UV)? light, nalidixic acid (NA), methyl methanesulfonate (MMS), and mitomycin?C (MMC). These results suggest that the cloned gene is inducible by DNA damage similarly to the recA gene in E. coli. However, the cloned gene did not restore the DNA damage sensitivity of the E. coli recA?mutant
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KEYWORD
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Pseudomonas sp., recA-like gene, DNA damage, SOS DNA repair
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