Induced conformational changes activate the peptidoglycan synthase PBP1B.

Induced conformational changes activate the peptidoglycan synthase PBP1B.
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诱导的构象变化激活了肽聚糖合酶PBP1B。

DOI:
10.1111/mmi.14082
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发表时间:
2018-11
影响因子:
3.6
通讯作者:
Simorre JP
Simorre JP
中科院分区:
生物学2区
文献类型:
--
作者:
Egan AJF;Maya-Martinez R;Ayala I;Bougault CM;Banzhaf M;Breukink E;Vollmer W;Simorre JP

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细菌的细胞质膜周围有一层必需的、承受压力的肽聚糖(PG)层,由短肽连接成网状结构的聚糖链组成。生长和分裂的细胞利用细胞膜锚定的PG合成酶(包括青霉素结合蛋白(PBPs))扩展PG层,这些酶参与动态蛋白质复合物,促进细胞壁生长。在大肠杆菌和其他革兰氏阴性细菌中,主要单层PG的生长受外膜锚定脂蛋白的调节。PBP1B是一种具有糖链聚合(糖基转移酶)和肽交联(转肽酶)活性的主要双功能PG合成酶,需要脂蛋白LpoB来激活PBP1B。在这项工作中,我们展示了LpoB与PBP1B的调控UB2H结构域的结合如何激活这两种活性。结合诱导UB2H结构域的结构变化,通过不同的变构途径转导到两个催化结构域。我们还展示了一种额外的调节蛋白CpoB如何能够选择性地通过LpoB调节TPase的激活而不干扰GTase的激活。
Bacteria surround their cytoplasmic membrane with an essential, stress‐bearing peptidoglycan (PG) layer consisting of glycan chains linked by short peptides into a mesh‐like structure. Growing and dividing cells expand their PG layer using inner‐membrane anchored PG synthases, including Penicillin‐binding proteins (PBPs), which participate in dynamic protein complexes to facilitate cell wall growth. In Escherichia coli, and presumably other Gram‐negative bacteria, growth of the mainly single layered PG is regulated by outer membrane‐anchored lipoproteins. The lipoprotein LpoB is required to activate PBP1B, which is a major, bi‐functional PG synthase with glycan chain polymerising (glycosyltransferase) and peptide cross‐linking (transpeptidase) activities. In this work we show how the binding of LpoB to the regulatory UB2H domain of PBP1B activates both activities. Binding induces structural changes in the UB2H domain, which transduce to the two catalytic domains by distinct allosteric pathways. We also show how an additional regulator protein, CpoB, is able to selectively modulate the TPase activation by LpoB without interfering with GTase activation.
DOI: 10.1016/0378-1119(95)00193-a
发表时间: 1995-05-26
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作者:
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发表时间: 2014-06-03
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作者:
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DOI: 10.1098/rstb.2015.0031
发表时间: 2015-10-05
期刊: Philosophical transactions of the Royal Society of London. Series B, Biological sciences
影响因子: --
作者:
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