A 43-kDa protein of Treponema denticola is essential for dentilisin activity.

A 43-kDa protein of Treponema denticola is essential for dentilisin activity.
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齿垢密螺旋体的 43 kDa 蛋白对于牙菌素活性至关重要。

DOI:
10.1016/s0378-1097(04)00067-9
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发表时间:
2004
影响因子:
2.1
通讯作者:
Okuda,Katsuji
Okuda,Katsuji
中科院分区:
生物学4区
文献类型:
--
作者:
Ishihara,Kazuyuki;Kuramitsu,HowardK;Okuda,Katsuji

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齿垢密螺旋体的一种蛋白酶 Dentilisin 被认为是 43 kDa 和 38 kDa 蛋白质复合物的一部分。编码 43 kDa 蛋白质的序列位于牙菌素基因 (prtP) 上游 prcA 基因的 3' 区域。 43-kDa 蛋白质显然是由 PrcA 消化产生的。为了阐明该蛋白质的功能,我们在同源重组后构建了 43-kDa 蛋白质的突变体。该突变体缺乏可检测到的牙本质素活性。免疫印迹分析表明牙菌素蛋白在突变体中被降解。实时聚合酶链反应结果表明,与野生型菌株相比,突变株中prtPmRNA表达量有所降低。这些数据表明 43-kDa 蛋白参与牙本质蛋白的稳定。
A protease ofTreponema denticola, dentilisin, is thought to be part of a complex with 43- and 38-kDa proteins. A sequence encoding a 43-kDa protein was located in the 3′ region of theprcAgene upstream of the dentilisin gene (prtP). The 43-kDa protein was apparently generated from digestion of PrcA. To clarify the function of the protein, we constructed a mutant of the 43-kDa protein following homologous recombination. The mutant lacked detectable dentilisin activity. Immunoblot analysis demonstrated that the dentilisin protein was degraded in the mutant. The results of real-time polymerase chain reaction suggested thatprtPmRNA expression in the mutant was somewhat decreased compared with the wild-type strain. These data suggest that the 43-kDa protein is involved in the stabilization of the dentilisin protein.
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