Pseudomonas aeruginosa MutL promotes large chromosomal deletions through non-homologous end joining to prevent bacteriophage predation.

Pseudomonas aeruginosa MutL promotes large chromosomal deletions through non-homologous end joining to prevent bacteriophage predation.
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铜绿假单胞菌 MutL 通过非同源末端连接促进大量染色体缺失,以防止噬菌体捕食。

DOI:
10.1093/nar/gky160
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发表时间:
2018-05-18
影响因子:
14.9
通讯作者:
Le S
Le S
中科院分区:
生物学2区
文献类型:
--
作者:
Shen M;Zhang H;Shen W;Zou Z;Lu S;Li G;He X;Agnello M;Shi W;Hu F;Le S

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摘要 铜绿假单胞菌是一种机会性病原体,具有相对较大的基因组,并且已被证明在环境选择过程中经常丢失基因组片段。然而,促进染色体缺失的潜在分子机制仍然知之甚少。在最近的一项研究中,我们表明,通过删除包含两个位置紧密的基因 hmgA 和 galU 的大染色体片段,铜绿假单胞菌能够形成“棕色突变体”,即具有棕色表型的噬菌体抗性突变体。在这项研究中,我们发现棕色突变体的出现频率为 227 ± 87 × 10−8,并且包含 ~200 至 ~620 kb 的缺失。通过筛选铜绿假单胞菌转座子突变体,我们鉴定了mutL基因,该基因的突变限制了噬菌体抗性棕色突变体的出现。此外,铜绿假单胞菌 MutL (PaMutL) 切口活性可导致 DNA 双链断裂 (DSB),然后通过非同源末端连接 (NHEJ) 进行修复,从而导致染色体缺失。因此,我们报道了 PaMutL 的一个非常规功能,即通过 NHEJ 促进染色体缺失,以防止噬菌体捕食。
Abstract Pseudomonas aeruginosa is an opportunistic pathogen with a relatively large genome, and has been shown to routinely lose genomic fragments during environmental selection. However, the underlying molecular mechanisms that promote chromosomal deletion are still poorly understood. In a recent study, we showed that by deleting a large chromosomal fragment containing two closely situated genes, hmgA and galU, P. aeruginosa was able to form ‘brown mutants’, bacteriophage (phage) resistant mutants with a brown color phenotype. In this study, we show that the brown mutants occur at a frequency of 227 ± 87 × 10−8 and contain a deletion ranging from ∼200 to ∼620 kb. By screening P. aeruginosa transposon mutants, we identified mutL gene whose mutation constrained the emergence of phage-resistant brown mutants. Moreover, the P. aeruginosa MutL (PaMutL) nicking activity can result in DNA double strand break (DSB), which is then repaired by non-homologous end joining (NHEJ), leading to chromosomal deletions. Thus, we reported a noncanonical function of PaMutL that promotes chromosomal deletions through NHEJ to prevent phage predation.
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