处理LtaS限制了LTA组装和YSIRK前蛋白贩运到Staphylococcus aureus的交叉墙
Amany M Ibrahim1,2, Muhammad S Azam1, Olaf Schneewind1
1Department of Microbiology, Howard Taylor Ricketts Laboratory, The University of Chicago, Lemont, Illinois, USA.
黄金葡萄球菌中的脂铁醇酸 (LTA) 合成由基基糖醇 (Glc2-DAG) 调节,控制YSIRK前体分泌. 这种机制确保了正常的细胞分裂和隔膜膜中的蛋白质贩运.
科学领域:
- 微生物学 微生物学
- 细胞生物学 细胞生物学
- 生物化学 生物化学
背景情况:
- 黄金葡萄球菌利用隔膜膜分泌YSIRK动机前体.
- 由ltaS介导的脂铁醇酸 (LTA) 合成对于YSIRK前体的贩运至关重要.
- 连接LTA组装和YSIRK前体贩运的确切机制尚不清楚.
研究的目的:
- 阐明连接LTA组装和YSIRK前体贩运的机制.
- 调查LtaS酶,其基质和产品在YSIRK前体局部化中的作用.
主要方法:
- 对金黄色葡萄球菌突变的遗传分析 (ypfP,ltaA,LtaS变种).
- 生物化学测试以评估LTA合成,前体贩运和酶加工.
- 脂质分析以确定脂糖醇 (PG) 与二甲酸糖醇 (DAG) 的比例.
主要成果:
- 在ypfP和ltaA突变体中失去Glc2-DAG,消除了YSIRK前体分泌.
- 缺少Glc2-DAG会影响LtaS处理到其细胞外催化域 (eLtaS).
- Glc2-DAG结合LtaS对联催化与ELtaS释放,调节LTA组合和隔膜脂质组成.
结论:
- 恩提奥二甲基糖醇 (Glc2-DAG) 作为LtaS处理和细胞外活动的关键调节剂.
- 提出了一个模型,其中基质结合控制了酶活性,建立了一个独特的隔膜脂质池.
- 这种脂质池对于在黄金葡萄球菌细胞分裂过程中将YSIRK前蛋白向隔膜至关重要.
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