Transcription of clpP is enhanced by a unique tandem repeat sequence in Streptococcus mutans.
Transcription of clpP is enhanced by a unique tandem repeat sequence in Streptococcus mutans.
复制标题
变形链球菌中独特的串联重复序列增强了 clpP 的转录。
DOI:
10.1128/jb.01436-08
复制
发表时间:
2009
影响因子:
3.2
通讯作者:
Biswas,Indranil
中科院分区:
文献类型:
--
作者:
Zhang,Jiaqin;Banerjee,Anirban;Biswas,Indranil
Streptococcus mutans, the primary causative agent of human dental caries, contains a single copy of the gene encoding ClpP, the chief intracellular protease responsible for tolerance to various environmental stresses. To better understand the role of ClpP in stress response, we investigated the regulation ofclpPexpression inS. mutans. Using semiquantitative reverse transcription-PCR analysis, we observed that, under nonstressed conditions,clpPexpression is somewhat constant throughout the growth phases, although it gradually decreases as cells enter the late stationary phase. The half-life of theclpPtranscript was found to be less than 1 minute. Sequence analysis of theclpPlocus reveals the presence of a 50-bp tandem repeat sequence located immediately upstream of theclpPpromoter (PclpP). PCR and DNA sequence analyses suggest that the number of tandem repeat units can vary from as few as two to as many as nine, depending on the particularS. mutansisolate. Further analysis, using a transcriptional reporter fusion consisting of PclpPfused to a promoterlessgusAgene, indicates that the presence of the repeat sequence region within PclpPresults in an approximately fivefold increase in expression from PclpPcompared to the repeat-free transcriptional reporter fusion. CtsR, a transcriptional repressor that negatively regulatesclpPexpression, has no effect on this repeat-mediated induction ofclpPtranscription. Furthermore, the repeat sequence is not necessary for the induction ofclpPunder stress conditions. Database searches indicate that the region containing the tandem repeats is absent in theclpPloci in other bacteria, including other closely relatedStreptococcusspp., suggesting that the repeat sequences are specific for the induction ofclpPexpression inS. mutans. We speculate that a host-specific transcriptional activator might be involved in the upregulation ofclpPexpression inS. mutans.
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DOI:
10.1093/clinids/10.6.1163
发表时间:
1988
期刊:
Reviews of infectious diseases
影响因子:
--
作者:
Larry M. Baddour
通讯作者:
Larry M. Baddour
DOI:
10.1093/infdis/153.1.116
发表时间:
1986
期刊:
The Journal of infectious diseases
影响因子:
--
作者:
vandeRijn,I;George,M;Bouvet,A;Roberts,RB
通讯作者:
Roberts,RB
影响因子:
3.2
作者:
PEREZCASAL, J;CAPARON, MG;SCOTT, JR
通讯作者:
SCOTT, JR
DOI:
--
发表时间:
1994
影响因子:
11.1
作者:
T. Msadek;Frank Kunst;Georges Rapoport
通讯作者:
Georges Rapoport
影响因子:
3.2
作者:
Gerth, U;Kirstein, J;Hecker, M
通讯作者:
Hecker, M