MCM core complex / Assembly of the pre-replicative complex / Switching of origins to a post-replicative state / MCM complex binding / nuclear DNA replication / premeiotic DNA replication / pre-replicative complex assembly involved in nuclear cell cycle DNA replication / Activation of the pre-replicative complex / mitotic DNA replication / CMG complex ...MCM core complex / Assembly of the pre-replicative complex / Switching of origins to a post-replicative state / MCM complex binding / nuclear DNA replication / premeiotic DNA replication / pre-replicative complex assembly involved in nuclear cell cycle DNA replication / Activation of the pre-replicative complex / mitotic DNA replication / CMG complex / nuclear pre-replicative complex / DNA replication preinitiation complex / Activation of ATR in response to replication stress / double-strand break repair via break-induced replication / MCM complex / mitotic DNA replication initiation / silent mating-type cassette heterochromatin formation / single-stranded DNA helicase activity / regulation of DNA-templated DNA replication initiation / DNA strand elongation involved in DNA replication / nuclear replication fork / DNA replication origin binding / DNA replication initiation / subtelomeric heterochromatin formation / DNA helicase activity / helicase activity / transcription elongation by RNA polymerase II / peroxisome / heterochromatin formation / single-stranded DNA binding / DNA helicase / DNA replication / chromosome, telomeric region / DNA damage response / chromatin binding / ATP hydrolysis activity / zinc ion binding / nucleoplasm / ATP binding / nucleus / cytoplasm 類似検索 - 分子機能
ジャーナル: Nat Struct Mol Biol / 年: 2022 タイトル: Structural mechanism for the selective phosphorylation of DNA-loaded MCM double hexamers by the Dbf4-dependent kinase. 著者: Julia F Greiwe / Thomas C R Miller / Julia Locke / Fabrizio Martino / Steven Howell / Anne Schreiber / Andrea Nans / John F X Diffley / Alessandro Costa / 要旨: Loading of the eukaryotic replicative helicase onto replication origins involves two MCM hexamers forming a double hexamer (DH) around duplex DNA. During S phase, helicase activation requires MCM ...Loading of the eukaryotic replicative helicase onto replication origins involves two MCM hexamers forming a double hexamer (DH) around duplex DNA. During S phase, helicase activation requires MCM phosphorylation by Dbf4-dependent kinase (DDK), comprising Cdc7 and Dbf4. DDK selectively phosphorylates loaded DHs, but how such fidelity is achieved is unknown. Here, we determine the cryogenic electron microscopy structure of Saccharomyces cerevisiae DDK in the act of phosphorylating a DH. DDK docks onto one MCM ring and phosphorylates the opposed ring. Truncation of the Dbf4 docking domain abrogates DH phosphorylation, yet Cdc7 kinase activity is unaffected. Late origin firing is blocked in response to DNA damage via Dbf4 phosphorylation by the Rad53 checkpoint kinase. DDK phosphorylation by Rad53 impairs DH phosphorylation by blockage of DDK binding to DHs, and also interferes with the Cdc7 active site. Our results explain the structural basis and regulation of the selective phosphorylation of DNA-loaded MCM DHs, which supports bidirectional replication.