SirA inhibits the essential DnaA:DnaD interaction to block helicase recruitment during Bacillus subtilis sporulation
SirA inhibits the essential DnaA:DnaD interaction to block helicase recruitment during Bacillus subtilis sporulation
复制标题
SirA 抑制必需的 DnaA:DnaD 相互作用,以阻止枯草芽孢杆菌孢子形成过程中解旋酶的招募
DOI:
10.1101/2022.04.18.488658
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发表时间:
2022
期刊:
影响因子:
--
通讯作者:
Winterhalter C
中科院分区:
文献类型:
--
作者:
Winterhalter C
Bidirectional DNA replication from a chromosome origin requires the asymmetric loading of two helicases, one for each replisome. Our understanding of the molecular mechanisms underpinning helicase loading at bacterial chromosome origins is incomplete. Here we report both positive and negative mechanisms for directing helicase recruitment in the model organismBacillus subtilis. Systematic characterization of the essential initiation protein DnaD revealed distinct protein interfaces required for homo-oligomerization, interaction with the master initiator protein DnaA, and interaction with the helicase co-loader protein DnaB. Informed by these properties of DnaD, we went on to find that the developmentally expressed repressor of DNA replication initiation, SirA, blocks the interaction between DnaD and DnaA, thereby restricting helicase recruitment from the origin during sporulation to inhibit further initiation events. These results advance our understanding of the mechanisms underpinning DNA replication initiation inB. subtilis, as well as guiding the search for essential cellular activities to target for antimicrobial drug design.
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