Peptidoglycan recycling mediated by an ABC transporter in the plant pathogen Agrobacterium tumefaciens

Peptidoglycan recycling mediated by an ABC transporter in the plant pathogen Agrobacterium tumefaciens
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植物病原体农杆菌中 ABC 转运蛋白介导的肽聚糖回收

DOI:
10.1101/2022.07.15.499691
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发表时间:
2022
影响因子:
16.6
通讯作者:
Felipe Cava
Felipe Cava
中科院分区:
综合性期刊1区
文献类型:
--
作者:
M. C. Gilmore;Felipe Cava

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在生长和分裂期间,细菌细胞壁肽聚糖(PG)被重塑,导致PG胞肽的释放,其通常被再内化和再循环。属于α变形菌纲的根瘤菌目和红球藻目的细菌缺乏胞肽转运蛋白AmpG,尽管具有其他关键的PG再循环酶。在这里,我们表明,另一种转运蛋白,YejBEF-YepA,接管这一作用的根瘤菌目植物病原体根癌农杆菌。YejBEF-YepA的胞肽输入控制A.根癌农杆菌(tumefaciens),有助于β-内酰胺抗性。然而,我们发现,缺乏YejBEF-YepA导致严重的细胞壁缺陷,远远超出降低AmpC活性。因此,与先前建立的革兰氏阴性菌模型相反,PG再循环对A.根瘤菌YepA广泛存在于根瘤菌目和杜鹃花科中,这表明YejBEF-YepA介导的PG回收可能代表了这些细菌细胞壁生物学的一个重要但被忽视的方面。一些细菌使用胞肽转运蛋白AmpG来摄取和回收在细胞生长和分裂期间释放的细胞壁片段。在这里,Gilmore和Cava表明,缺乏AmpG同源物的植物病原体根癌农杆菌使用不同类型的转运蛋白来实现相同的功能,这对于该生物体的正常生长至关重要。
During growth and division, the bacterial cell wall peptidoglycan (PG) is remodelled, resulting in the liberation of PG muropeptides which are typically reinternalized and recycled. Bacteria belonging to the Rhizobiales and Rhodobacterales orders of the Alphaproteobacteria lack the muropeptide transporter AmpG, despite having other key PG recycling enzymes. Here, we show that an alternative transporter, YejBEF-YepA, takes over this role in the Rhizobiales phytopathogen Agrobacterium tumefaciens . Muropeptide import by YejBEF-YepA governs expression of the β-lactamase AmpC in A. tumefaciens , contributing to β-lactam resistance. However, we show that the absence of YejBEF-YepA causes severe cell wall defects that go far beyond lowered AmpC activity. Thus, contrary to previously established Gram-negative models, PG recycling is vital for cell wall integrity in A. tumefaciens . YepA is widespread in the Rhizobiales and Rhodobacterales, suggesting that YejBEF-YepA-mediated PG recycling could represent an important but overlooked aspect of cell wall biology in these bacteria. Some bacteria use the muropeptide transporter AmpG for uptake and recycling of cell wall fragments that are released during cell growth and division. Here, Gilmore & Cava show that the plant pathogen Agrobacterium tumefaciens , which lacks an AmpG homologue, uses a different type of transporter for the same function, which is essential for normal growth in this organism.
DOI: 10.1002/anie.201206749
发表时间: 2012-12-07
期刊: Angewandte Chemie (International ed. in English)
影响因子: --
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农杆菌的实验室维护。
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影响因子: 14.8
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