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.
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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
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发表时间:
2009
影响因子:
3.2
通讯作者:
Biswas,Indranil
Biswas,Indranil
中科院分区:
生物学3区
文献类型:
--
作者:
Zhang,Jiaqin;Banerjee,Anirban;Biswas,Indranil

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变形链球菌是人类龋齿的主要致病菌,含有编码 ClpP 的基因的单个拷贝,ClpP 是负责耐受各种环境压力的主要细胞内蛋白酶。为了更好地了解 ClpP 在应激反应中的作用,我们研究了 ClpP 在 S 中表达的调节。突变体。使用半定量逆转录-PCR 分析,我们观察到,在非应激条件下,clpP 表达在整个生长期中有些恒定,尽管随着细胞进入稳定期后期而逐渐减少。发现clpP转录物的半衰期小于1分钟。 clpP位点的序列分析揭示了紧邻clpP启动子(PclpP)上游的50-bp串联重复序列的存在。 PCR 和 DNA 序列分析表明,串联重复单元的数量可以从少至两个到多至九个不等,具体取决于具体的 S。突变体。使用由与无启动子gusA基因融合的PclpP组成的转录报告基因融合体进行的进一步分析表明,与无重复的转录报告基因融合体相比,PclpPre中重复序列区域的存在导致PclpP的表达增加了大约五倍。 CtsR 是一种负向调节 sclpP 表达的转录抑制因子,对这种重复介导的 clpP 转录诱导没有影响。此外,重复序列对于应激条件下clpP的诱导不是必需的。数据库检索表明,包含串联重复序列的区域在其他细菌(包括其他密切相关的链球菌属)的clp位点中不存在,这表明重复序列对于诱导链球菌中的clpP表达具有特异性。突变体。我们推测宿主特异性转录激活因子可能参与S.clpP表达的上调。突变体。
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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