脂蛋白激活剂通过不同的机制刺激大肠杆菌的青素结合蛋白
Tania J Lupoli1, Matthew D Lebar, Monica Markovski
1Department of Microbiology and Immunobiology, Harvard Medical School , Boston, Massachusetts 02115, United States.
Journal of the American Chemical Society
|December 18, 2013
概括
外膜脂蛋白LpoA和LpoB激活参与细菌细胞壁合成的青素结合蛋白 (PBPs). 它们通过不同的机制增强甘氨基转移酶和转酶活动,揭示了双向合.
科学领域:
- 微生物学 微生物学
- 分子生物学分子生物学
- 生物化学 生物化学
背景情况:
- 青素结合蛋白 (PBP) 是细菌甘油 (PG) 生物合成中必不可少的酶.
- 在大肠杆菌中,双功能PBP PBP1A和PBP1B具有葡萄糖转移酶 (PGT) 和转酶 (TP) 域.
- 已知外膜脂蛋白LpoA和LpoB对PBP1A和PBP1B的功能是相应的.
研究的目的:
- 阐明LpoA和LpoB调节PBP1A和PBP1B活动的机制.
- 研究 PBP 的 PGT 和 TP 域之间的功能相互作用.
- 为研究PBP激活剂和抑制剂建立一个转化试验.
主要方法:
- 使用补充生物化学分析来测量PGT和TP活动.
- 研究了LpoA和LpoB对相关PBP酶域的直接影响.
- 开发并应用了PBPTP域分析的转化试验.
主要成果:
- 通过直接增加TP反应的速率,LpoA增强了PBP1A的活性,次要地增加了PGT的活性.
- 通过直接调节 PGT 域函数,LpoB 增强了 PBP1B 的活性,从而增加了 TP 的活性.
- 在PBP中展示了PGT和TP领域活动之间的双向合.
结论:
- 通过不同的机制,LpoA和LpoB通过不同的机制不同调节PBP活性,突出了特定的脂蛋白-PBP相互作用.
- 这些发现揭示了由外膜脂蛋白协调调节丁糖甘合成的情况.
- 开发的转化试验为发现新型PBP调节剂提供了有价值的工具,准重要的细菌药物标.
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