Lipoprotein cofactors located in the outer membrane activate bacterial cell wall polymerases.

Lipoprotein cofactors located in the outer membrane activate bacterial cell wall polymerases.
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DOI:
10.1016/j.cell.2010.11.037
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发表时间:
2010-12-23
期刊:
影响因子:
64.5
通讯作者:
Bernhardt TG
Bernhardt TG
中科院分区:
生物学1区
文献类型:
--
作者:
Paradis-Bleau C;Markovski M;Uehara T;Lupoli TJ;Walker S;Kahne DE;Bernhardt TG

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大多数细菌用肽聚糖(PG)外骨骼包围自己,该外骨骼由称为青霉素结合蛋白(PBP)的多糖聚合酶合成。由于它们是青霉素和相关抗生素的作用靶点,因此其结构和生化功能已被广泛研究。尽管如此,我们仍然对这些酶如何在体内构建PG层知之甚少。在这里,我们确定大肠杆菌外膜脂蛋白LpoA和LpoB作为必不可少的PBP辅因子。我们发现,LpoA和LpoB形成特定的反式包膜复合物与其同源PBP和PBP在体内的功能是至关重要的。我们进一步表明,LpoB促进PG合成的合作伙伴PBP在体外,它可能是通过刺激聚糖链聚合。总的来说,我们的研究结果表明,PBP辅助蛋白在PG生物发生中起着核心作用,并且与它们一起工作的PBP一样,这些因素是抗生素开发的有吸引力的目标。
Most bacteria surround themselves with a peptidoglycan (PG) exoskeleton synthesized by polysaccharide polymerases called penicillin-binding proteins (PBPs). Because they are the targets of penicillin and related antibiotics, the structure and biochemical functions of the PBPs have been extensively studied. Despite this, we still know surprisingly little about how these enzymes build the PG layer in vivo. Here, we identify the Escherichia coli outer membrane lipoproteins LpoA and LpoB as essential PBP cofactors. We show that LpoA and LpoB form specific trans-envelope complexes with their cognate PBP and are critical for PBP function in vivo. We further show that LpoB promotes PG synthesis by its partner PBP in vitro and that it likely does so by stimulating glycan chain polymerization. Overall, our results indicate that PBP accessory proteins play a central role in PG biogenesis and, like the PBPs they work with, these factors are attractive targets for antibiotic development.
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