尿素双酸盐 区分 糖转移酶 超级家族
Leah M Seebald1, Pouya Haratipour2, Michaela R Jacobs2
1Department of Biology and Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
研究人员开发了新的尿素二酸 (UBP) 糖模仿剂,以研究细菌糖转移酶 (PGTs). 这些UBP糖揭示了多型和单型PGT超级家族的独特结合机制,为新的抗生素开发提供了潜力.
科学领域:
- 生物化学 生物化学
- 微生物学 微生物学
- 化学生物学 化学生物学
背景情况:
- 复杂的细菌糖结合物对于病原体与宿主相互作用和细菌生存至关重要.
- 糖酶转移酶 (PGTs) 启动糖合物生物合成,具有明显的多类型和单类型超级家族,表现出结构和机理上的差异.
- 了解PGT机制对于开发向抗菌剂至关重要.
研究的目的:
- 设计和合成非水解性尿素二酸 (UBP) 模仿尿素二酸糖 (UDP-糖) 基质.
- 利用UBP糖作为化学探针来研究不同PGT超级家族的结构和机制.
- 探索UBP糖的潜力,作为新型抗生素开发的支架.
主要方法:
- 一系列尿素双酸盐 (UBPs) 的合成,其中一个替代的甲基取代了二酸盐桥梁氧.
- 在UBPs的β-酸盐中加入N-乙葡萄糖胺 (GlcNAc).
- 合成的UBP糖作为多型PGT (WecA) 和单型PGT (PglC) 的抑制剂的评估.
主要成果:
- 不同的UBP-糖类类似物对WecA和PglC表现出不同的抑制功效,表明不同的联体结合模式.
- CF2-BP结合物强烈抑制了单一的PGLC,而CH2-BP模拟物最有效地抑制了多重的WecA.
- 双立体CHF-BP结合物表现出不同的结合亲和力,而GlcNAc的结合改善了结合,突出显示了立体化学和糖化物影响.
结论:
- UBP-糖作为一个有价值的工具,用于阐明多重型和单重型PGT超级家族的分离机制.
- 观察到的抑制差异表明与Mg2+的相互作用发生了变化,并突出显示了连接体结构在PGT结合中的重要性.
- UBP糖是开发新型抗生素的有希望的支架,其目标是必不可少的单一型PGT超级家族.
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