纤维原体结合的M相关蛋白质有助于Streptococcus pyogenes招募塑原体
Emma-Jayne Proctor1, Hannah R Frost2, Bhanu Mantri1
1Molecular Horizons Research Institute and School of Science, University of Wollongong, Wollongong, New South Wales, Australia.
Protein science : a publication of the Protein Society
|March 18, 2025
概括
甲组链球菌M相关蛋白 (Mrp) 结合人体纤维素原,有助于细菌的生存. 在MRP的序列多样性影响相互作用,并使可替代的等离子体的招募,影响宿主-病原体的动态.
科学领域:
- 微生物学 微生物学
- 免疫学 免疫学 免疫学
- 结构生物学 结构生物学
背景情况:
- 甲组链球菌 (GAS) 使用M相关蛋白 (Mrp) 与宿主因子相互作用.
- Mrp是细胞壁附着的蛋白质,结合人体纤维素原 (Fg),增强细菌的毒性.
- 在Mrp中存在序列多样性,但其对宿主相互作用的影响尚不清楚.
研究的目的:
- 调查Mrp序列多样性对纤维素素 (Fg) 结合的影响.
- 探索Mrp在等离子素 (Plg) 招募中的作用.
- 了解Mrp对A组链球菌宿主-病原体相互作用的贡献.
主要方法:
- 负染色传输电子显微镜以确定Mrp的结构和大小.
- 质量摄影测量以确认MRP的二分化.
- 表面等离子体共振来量化Mrp-Fg结合亲和力.
主要成果:
- Mrp是纤维状二元蛋白质,其长度在45.4和47.3nm之间.
- 所有测试的Mrp变体通过碎片D与纳米分子亲和力结合Fg.
- Mrp促进了等离子素 (Plg) 的结合,特别是在Fg预化后,这表明了另一种获得Plg的机制.
结论:
- Mrp序列的多样性并不能阻止Fg结合,所有变体都显示出高亲和力.
- Mrp 代表了 GAS 对等离子素招募的替代途径.
- Mrp在A组链球菌的发病过程中起着重要作用,因此需要进一步的体内研究.
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