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Visualization of mismatch repair in bacterial cells.

机译:细菌细胞中错配修复的可视化。

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We determined the localizations of mismatch repair proteins in living Bacillus subtilis cells. MutS-GFP colocalized with the chromosome in all cells and formed foci in a subset of cells. MutL-GFP formed foci in a subset of cells, and its localization was MutS dependent. The introduction of mismatches by growth in 2-aminopurine caused a replication-dependent increase in the number of cells with MutS and MutL foci. Approximately half of the MutS foci colocalized with DNA polymerase foci. We conclude that MutS is associated with the entire chromosome, poised to detect mismatches. After detection, it appears that mismatch repair foci assemble at mismatches as they emerge from the DNA polymerase and are then carried away from the replisome by continuing replication.
机译:我们确定了活的枯草芽孢杆菌细胞中错配修复蛋白的定位。 MutS-GFP在所有细胞中均与染色体共定位,并在一部分细胞中形成病灶。 MutL-GFP在细胞亚群中形成病灶,其定位是MutS依赖性的。通过2-氨基嘌呤的生长引入错配会导致MutS和MutL病灶的细胞数量依赖复制而增加。大约一半的MutS病灶与DNA聚合酶病灶共定位。我们得出的结论是MutS与整个染色体相关,可以检测错配。在检测之后,似乎错配修复灶在错配处组装,因为它们从DNA聚合酶中出现,然后通过继续复制而从复制体中带走。

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