来自Clostridium perfringens的生物膜矩阵蛋白的IV型 pili相关分泌,该蛋白形成分子间异酸键
Sarah E Kivimaki1, Samantha Dempsey1, Collette Camper1
1Department of Biological Sciences, Virginia Tech, Blacksburg, VA 24061, USA.
bioRxiv : the preprint server for biology
|November 22, 2024
概括
杆菌利用IV型 pili基因进行蛋白质分泌,将BsaC和BsaA确定为关键分泌的蛋白质. BsaA通过异酸键形成寡合体,这表明了格拉姆阳性细菌中一种新的分泌机制.
科学领域:
- 微生物学 微生物学
- 细菌病原体的产生
- 蛋白质分泌 蛋白质分泌
背景情况:
- 克洛斯特里透是一种具有两种IV型 pili (T4P) 基因组的格拉姆阳性病原体.
- 一个T4P组有助于粘附;第二个可以作为一种Gram阳性细菌的II型分泌系统 (TTSS).
- 格拉姆阳性细菌面临分泌障碍,原因是它们厚厚的甘油层.
研究的目的:
- 调查C. perfringens中的T4P相关基因是否构成一种阳性TTSS.
- 为了识别通过这种假设系统分泌的蛋白质.
主要方法:
- 对T4P突变体的秘密组分析.
- 蛋白质的识别和表征 (BsaC,BsaA,BsaB).
- 对BsaA单体相互作用的新建建模和突变分析.
- 对BsaA家族蛋白质的遗传学分析.
主要成果:
- BsaC是一种von Willebrand A域蛋白,需要pilin PilA3进行分泌.
- BsaA和BsaB是假设的生物膜矩阵蛋白质,在与BsaC的操作子中分泌.
- 通过捐赠链交换机制,BsaA单体通过异类键进行寡合.
- 突变破坏预测的异类键形成,取消了BsaA的寡合化.
结论:
- 在C. perfringens中的第二个T4P基因组可能作为TTSS功能.
- BsaC是通过这个系统分泌的.
- BsaA利用了一种新型的异酸键介导的寡合化和分泌机制,有可能克服阳性分泌障碍.
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