酸身份调节宿主热带性 糖结合维里丹群 链球菌群 链球菌
KeAndreya M Morrison1, Rupesh Agarwal2, Haley E Stubbs3
1Department of Pharmacology, School of Graduate Studies, Meharry Medical College, Nashville, TN, USA.
The Journal of biological chemistry
|August 1, 2025
概括
微生物宿主热带性受酸类型的影响,但不仅仅由它决定. 这项研究表明,虽然改变链球菌与特定酸 (Neu5Gc) 的结合可以改变宿主偏好,但其他因素也起作用.
科学领域:
- 微生物学 微生物学
- 葡萄糖生物学 葡萄糖生物学
- 宿主-病原体相互作用
背景情况:
- 微生物与宿主之间的相互作用对于病原体储存和动物传染病溢出至关重要.
- 维里达斯群链球菌通过酸覆盖的甘氨酸 (sialoglycans) 结合宿主细胞.
- 主体特异性可能源于酸合成的差异 (人类使用Neu5Ac,哺乳动物使用Neu5Ac和Neu5Gc).
研究的目的:
- 通过实验测试酸结合偏好与链球菌宿主偏好之间的联系.
- 研究N-乙神经氨基酸 (Neu5Ac) 和N-甘神经氨基酸 (Neu5Gc) 在 estreptococcal 主体热带的作用.
主要方法:
- 从 *Streptococcus gordonii* (SLBRHsa) 和 *Streptococcus sanguinis* (SLBRSrpA) 获得的 Siglec-like 结合区域 (SLBR) 的结构和计算分析.
- 工程 SLBR 对于对 Neu5Gc 终结型甘氨酸的改变选择性.
- 测试对人类和老鼠等离子体受体的结合偏好.
主要成果:
- 通过SLBRHsa确定了Neu5Ac/Neu5Gc结合的分子细节.
- 为Neu5Gc偏好进行工程,将结合从人类转移到大鼠血受体.
- 然而,改变糖甘偏好并不能完全预测宿主受体偏好的变化.
结论:
- 酸的身份调节,但不仅仅决定,宿主偏好在这些链球菌.
- 这挑战了关于酸在确定宿主热带性中的主要作用的假设.
- 改进了对微生物宿主特异性背后的复杂机制的理解.
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