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
Cleary,PP
中科院分区:
生物学3区
文献类型:
--
作者:
Bormann,NE;Cleary,PP

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化脓性链球菌的几种表面毒力蛋白的转录受Mga调节,Mga是一种与双组分信号转导系统的反应调节因子具有同源性的蛋白质。这些表面毒力蛋白中的两个,M蛋白和C5 a肽酶,经历相变化。为了确定Mga本身是否经历相位变化并且可能允许相位开关协调这些基因的活性,分析了mga基因的表达。我们首次发现有两种mga特异性转录物:一种是3.8 kb的双顺反子信息,包括mga和emm 12基因,另一种是1.6 kb的单顺反子mga信息。这两种转录物的相位不同,并且在M+变体中比在M-变体中存在更高的量。用利福平孵育RNA表明,较小的1.6 kb信息不是加工产物。两个启动子被定位在mga的上游:P1在位置666(-395)和P2在位置978(-83)。在菌株CS46(Δmga)中,不发生从P1启动子的转录起始,并且在P2启动子周围发现多个起始位点。互补实验表明,P2启动子的上游序列是Mga反式激活emm 12和scpA所必需的。
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.
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
virR 在化脓性链球菌 M49 中的插入失活表明 VirR 作为 ScpA、FcRA、OF 和 M 蛋白的正调节因子发挥作用。
DOI: 10.1111/j.1574-6968.1995.tb07498.x
发表时间: 1995
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
DOI: 10.1128/jb.173.8.2617-2624.1991
发表时间: 1991-04-01
影响因子: 3.2
作者:
PEREZCASAL, J;CAPARON, MG;SCOTT, JR
通讯作者: SCOTT, JR
DOI: 10.1126/science.2537530
发表时间: 1989-02-17
期刊: SCIENCE
影响因子: 56.9
作者:
MILLER, JF;MEKALANOS, JJ;FALKOW, S
通讯作者: FALKOW, S