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在Treponema denticola中聚集的细菌素类型信号域蛋白质基因的表征

Tomoyuki Nukaga¹, Eitoyo Kokubu², Kazuko Okamoto-Shibayama²

¹Department of Endodontics, Tokyo Dental College, Tokyo, Japan.

Frontiers in dental medicine

|March 6, 2025

概括

细菌类型的Treponema denticola信号域蛋白质由细胞分泌,在正常条件下得到表达. 当与Treponema vincentii共同培养时,它们的表达量下降,这表明它们在细菌间竞争中的作用.

科学领域:

微生物学微生物学
细菌学细菌学是一门学科.
口腔微生物学口腔微生物学

背景情况:

牙周炎与牙下斑块失生有关, *Treponema denticola* 被确定为一个关键的病原体.
细菌素在失生症期间的细菌间竞争中发挥作用.
在T. denticola*中,三种潜在的细菌素ABC转运基因 (*tepA1-B1, tepA2-B2, tepA3-B3*) 和相关的上游细菌素类型信号域蛋白的功能以前没有被描述.

研究的目的:

为了描述T. denticola*中的细菌类信号域蛋白质.
阐明这些蛋白质在细菌间竞争和牙周炎病原体的背景下所扮演的角色.
研究细菌类信号域蛋白与细菌ABC载体基因之间的关系.

主要方法:

围绕细菌素类型信号域蛋白质基因的基因集群的in silico比较.
实时定量逆转录PCR (qRT-PCR) 用于评估基因表达.
免疫块分析以检测细菌类信号域蛋白质.
与*Treponema vincentii*共同培养以研究类似细菌素的蛋白质表达.

主要成果:

细菌类信号域蛋白质基因和上游脂蛋白基因的DNA序列高度保存.
细菌类信号域蛋白和*tepA1*的表达在中间日志阶段比静止阶段更高.
在与 *T. vincentii* 共同培养时表达力下降; *tepA1* 表达力独立于 *tepA2* 和 *tepA3*.
在培养超级生物中检测到类似细菌素的蛋白质,但没有观察到杀菌活性.

结论:

三个联的脂蛋白-细菌素类型信号域蛋白质基因可能是从重复中产生的.
细菌类信号域蛋白在非刺激条件下表达,并由T. denticola*细胞分泌.
这些蛋白质可能在细菌间的竞争中发挥作用,因为它们的表达通过与T. vincentii共同培养而受到调节.

关键词:

在Treponema denticola中使用.在这种情况下,细菌菌会产生.细菌素ABC载体的转运器聚类脂蛋白是指聚类的脂蛋白.牙周炎是指牙周炎的一种疾病.

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