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RISS 인기검색어
- 검색키워드
- 저자 : ( Chandrani Chattopadhyay ) (검색결과 2 건)
- 무료
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Cloning and Characterization of the Promoters of Temperate Mycobacteriophage L1
( Chandrani Chattopadhyay ),( Subrata Sau ),( Nitai C. Mandal ) 생화학분자생물학회 2003 BMB Reports Vol.36 No.6
Four putative promoters of the temperate mycobacteriophage L1 were cloned by detecting the β-galactosidase reporter expression in E. coli transformants that carried L1 specific operon-fusion library. All of the four L1 promoters were also found to express differentially in the homologous environment of mycobacteria. Of the four promoters, two were suggested to be the putative early promoters of L1 since they express within 0 to 10 inin of the initiation of the lytic growth of L1. One of the putative early promoters showed a relatively better and almost identical activity in both E. coli and M. smegmatis. By a sequence analysis, we suggest that the L1 insert that contained the stronger early promoter possibly carries two convergent E. coli σ^(70)-like L1 promoters, which are separated from each other by about 300 nucleotides. One of them is the early promoter of L1 as it showed a 100% similarity with the early P_)left) promoter of the homoimmune phage L5. The second promoter, designated P4, was suggested for its appreciable level of reporter activity in the absence of the -10 element of the P_(left) equivalent of L1. By analyzing most of the best characterized mycobacteriophages-specific promoters, including the L1 promoter P4, we suggest that both the - 10 and -35 hexamers of the mycobacteriophage promoters are highly conserved and almost similar to the consensus - 10 and -35 hexamers of the E. coli σ^(70) promoters.
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Cloning and Characterization of the Promoters of Temperate Mycobacteriophage L1
Chattopadhyay, Chandrani,Sau, Subrata,Mandal, Nitai C. Korean Society for Biochemistry and Molecular Biol 2003 Journal of biochemistry and molecular biology Vol.36 No.6
Four putative promoters of the temperate mycobacteriophage L1 were cloned by detecting the $\beta$-galactosidase reporter expression in E. coli transformants that carried L1 specific operon-fusion library. All of the four L1 promoters were also found to express differentially in the homologous environment of mycobacteria. Of the four promoters, two were suggested to be the putative early promoters of L1 since they express within 0 to 10 min of the initiation of the lytic growth of L1. One of the putative early promoters showed a relatively better and almost identical activity in both E. coli and M. smegmatis. By a sequence analysis, we suggest that the L1 insert that contained the stronger early promoter possibly carries two convergent E. coli $\sigma^{70}$-like L1 promoters, which are separated from each other by about 300 nucleotides. One of them is the early promoter of L1 as it showed a 100% similarity with the early $P_{left}$ promoter of the homoimmune phage L5. The second promoter, designated P4, was suggested for its appreciable level of reporter activity in the absence of the -10 element of the $P_{left}$ equivalent of L1. By analyzing most of the best characterized mycobacteriophages-specific promoters, including the L1 promoter P4, we suggest that both the -10 and -35 hexamers of the mycobacteriophage promoters are highly conserved and almost similar to the consensus -10 and -35 hexamers of the E. coli $\sigma^{70}$ promoters.
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