Lipoprotein activators stimulate Escherichia coli penicillin-binding proteins by different mechanisms.

Lipoprotein activators stimulate Escherichia coli penicillin-binding proteins by different mechanisms.
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DOI:
10.1021/ja410813j
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发表时间:
2014-01-08
影响因子:
15
通讯作者:
Walker S
Walker S
中科院分区:
化学1区
文献类型:
--
作者:
Lupoli TJ;Lebar MD;Markovski M;Bernhardt T;Kahne D;Walker S

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在大肠杆菌中,双功能青霉素结合蛋白(PBPs)PBP 1A和PBP 1B在肽聚糖(PG)生物合成的最后阶段起着关键作用。这些合成酶各自具有PG糖基转移酶(PGT)结构域和转肽酶(TP)结构域。最近的遗传实验表明,PBP 1A和PBP 1B各自需要一个外膜脂蛋白,LpoA和LpoB,分别在体内正常发挥作用。在这里,我们使用互补的分析表明,LpoA和LpoB各自增加其同源PBPs的PGT和TP活性,尽管是通过不同的机制。LpoA直接增加PBP 1A TP反应的速率,这也导致PGT活性增强;相反,LpoB直接影响PGT结构域活性,导致TP活性增强。这些研究证明了PGT和TP结构域功能的双向偶联。此外,本文所述的转肽测定可应用于研究PBPs的TP结构域的其他激活剂或抑制剂,其是经验证的药物靶标。
In Escherichia coli, the bifunctional penicillin-binding proteins (PBPs), PBP1A and PBP1B, play critical roles in the final stage of peptidoglycan (PG) biosynthesis. These synthetic enzymes each possess a PG glycosyltransferase (PGT) domain and a transpeptidase (TP) domain. Recent genetic experiments have shown that PBP1A and PBP1B each require an outer membrane lipoprotein, LpoA and LpoB respectively, to function properly in vivo. Here, we use complementary assays to show that LpoA and LpoB each increase the PGT and TP activities of their cognate PBPs, albeit by different mechanisms. LpoA directly increases the rate of the PBP1A TP reaction, which also results in enhanced PGT activity; in contrast, LpoB directly affects PGT domain activity, resulting in enhanced TP activity. These studies demonstrate bidirectional coupling of PGT and TP domain function. Additionally, the transpeptidation assay described here can be applied to study other activators or inhibitors of the TP domain of PBPs, which are validated drug targets.
DOI: 10.1016/j.cell.2010.11.037
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影响因子: 64.5
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Paradis-Bleau C;Markovski M;Uehara T;Lupoli TJ;Walker S;Kahne DE;Bernhardt TG
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