The Escherichia coli replisome is inherently DNA damage tolerant.
The Escherichia coli replisome is inherently DNA damage tolerant.
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DOI:
10.1126/science.1209111
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发表时间:
2011-10-14
期刊:
影响因子:
--
通讯作者:
Marians KJ
中科院分区:
文献类型:
--
作者:
Yeeles JT;Marians KJ
The Escherichia coli DNA replication machinery must frequently overcome template lesions under normal growth conditions. Yet, the outcome of a collision between the replisome and a leading-strand template lesion remains poorly understood. Here we demonstrate that a single, site-specific, cyclobutane pyrimidine dimer leading-strand template lesion provides only a transient block to fork progression in vitro. The replisome remains stably associated with the fork following collision with the lesion. Leading-strand synthesis is then reinitiated downstream of the damage in a reaction that is dependent on the primase, DnaG, but independent of any of the known replication-restart proteins. These observations reveal that the replisome can tolerate leading-strand template lesions without dissociating by synthesizing the leading strand discontinuously.
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