RadD is a RecA-dependent accessory protein that accelerates DNA strand exchange.
RadD is a RecA-dependent accessory protein that accelerates DNA strand exchange.
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DOI:
10.1093/nar/gkac041
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发表时间:
2022-02-28
影响因子:
14.9
通讯作者:
Cox MM
中科院分区:
文献类型:
--
作者:
Bonde NJ;Romero ZJ;Chitteni-Pattu S;Cox MM
In rapidly growing cells, with recombinational DNA repair required often and a new replication fork passing every 20 min, the pace of RecA-mediated DNA strand exchange is potentially much too slow for bacterial DNA metabolism. The enigmatic RadD protein, a putative SF2 family helicase, exhibits no independent helicase activity on branched DNAs. Instead, RadD greatly accelerates RecA-mediated DNA strand exchange, functioning only when RecA protein is present. The RadD reaction requires the RadD ATPase activity, does not require an interaction with SSB, and may disassemble RecA filaments as it functions. We present RadD as a new class of enzyme, an accessory protein that accelerates DNA strand exchange, possibly with a helicase-like action, in a reaction that is entirely RecA-dependent. RadD is thus a DNA strand exchange (recombination) synergist whose primary function is to coordinate closely with and accelerate the DNA strand exchange reactions promoted by the RecA recombinase. Multiple observations indicate a uniquely close coordination of RadD with RecA function.
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