Transcriptional analysis of mga, a regulatory gene in Streptococcus pyogenes: identification of monocistronic and bicistronic transcripts that phase vary.
Transcriptional analysis of mga, a regulatory gene in Streptococcus pyogenes: identification of monocistronic and bicistronic transcripts that phase vary.
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mga(化脓性链球菌中的一种调节基因)的转录分析:相位变化的单顺反子和双顺反子转录物的鉴定。
DOI:
10.1016/s0378-1119(97)00392-2
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发表时间:
1997
期刊:
影响因子:
3.5
通讯作者:
Cleary,PP
中科院分区:
文献类型:
--
作者:
Bormann,NE;Cleary,PP
Transcription of several surface virulence proteins of Streptococcus pyogenes is regulated by Mga, a protein that shows homology to response regulators of two-component signal-transducing systems. Two of these surface virulence proteins, M protein and C5a peptidase, undergo phase variation. To determine whether Mga itself undergoes phase variation and might allow the phasing switch to coordinate the activity of these genes, expression of the mga gene was analyzed. We show for the first time that there are two mga-specific transcripts: a 3.8-kb bicistronic message that includes both mga and emm12 genes and a monocistronic 1.6-kb mga message. Both transcripts phase vary and are present in higher amounts in M+variants than in M−variants. Incubation of RNA with rifampicin indicates that the smaller 1.6-kb message is not a processed product. Two promoters were mapped upstream of mga: P1 at position 666 (−395) and P2 at position 978 (−83). In strain CS46 (Δmga), transcription initiation from the P1 promoter does not occur, and multiple start sites are found around the P2 promoter. Complementation experiments indicate that sequences upstream of the P2 promoter are required for activation of emm12 and scpA by Mga in trans.
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DOI:
10.1128/mr.55.3.371-394.1991
发表时间:
1991-09
期刊:
Microbiological Reviews
影响因子:
--
作者:
J. Collado-Vides;B. Magasanik;J. D. Gralla
通讯作者:
J. Collado-Vides;B. Magasanik;J. D. Gralla
影响因子:
2.1
作者:
McLandsborough,LA;Cleary,PP
通讯作者:
Cleary,PP
DOI:
--
发表时间:
1986
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Hollingshead,SK;Fischetti,VA;Scott,JR
通讯作者:
Scott,JR
影响因子:
3.2
作者:
PEREZCASAL, J;CAPARON, MG;SCOTT, JR
通讯作者:
SCOTT, JR
影响因子:
56.9
作者:
MILLER, JF;MEKALANOS, JJ;FALKOW, S
通讯作者:
FALKOW, S