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
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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
Winterhalter C
中科院分区:
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作者:
Winterhalter C

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从染色体起点进行的双向 DNA 复制需要不对称加载两个解旋酶,每个复制体对应一个解旋酶。我们对细菌染色体起源解旋酶负载的分子机制的理解并不完整。在这里,我们报告了在模型生物枯草芽孢杆菌中指导解旋酶募集的积极和消极机制。必需起始蛋白 DnaD 的系统表征揭示了同源寡聚化、与主起始蛋白 DnaA 相互作用以及与解旋酶辅助加载蛋白 DnaB 相互作用所需的不同蛋白质界面。根据 DnaD 的这些特性,我们继续发现,发育表达的 DNA 复制起始阻遏物 SirA 阻断 DnaD 和 DnaA 之间的相互作用,从而限制孢子形成过程中解旋酶从起点的募集,以抑制进一步的起始事件。这些结果增进了我们对 B 中 DNA 复制起始机制的理解。枯草芽孢杆菌,以及指导寻找抗菌药物设计目标的基本细胞活性。
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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