- EMDB-60347: Cryo-EM structure of origin recognition complex (Orc6 with residu... -
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基本情報
登録情報
データベース: EMDB / ID: EMD-60347
タイトル
Cryo-EM structure of origin recognition complex (Orc6 with residues 1 to 270 deleted) with ARS1 DNA bound
マップデータ
試料
複合体: ARS1 bound origin recognition complex with truncated Orc6
タンパク質・ペプチド: Origin recognition complex subunit 2
タンパク質・ペプチド: Origin recognition complex subunit 5
タンパク質・ペプチド: Origin recognition complex subunit 6
DNA: DNA (38-MER)
DNA: DNA (40-MER)
タンパク質・ペプチド: Origin recognition complex subunit 1
タンパク質・ペプチド: Origin recognition complex subunit 3
タンパク質・ペプチド: Origin recognition complex subunit 4
リガンド: PHOSPHOTHIOPHOSPHORIC ACID-ADENYLATE ESTER
リガンド: MAGNESIUM ION
キーワード
REPLICATION
機能・相同性
機能・相同性情報
CDC6 association with the ORC:origin complex / Cul8-RING ubiquitin ligase complex / maintenance of rDNA / Assembly of the ORC complex at the origin of replication / nuclear origin of replication recognition complex / pre-replicative complex assembly involved in nuclear cell cycle DNA replication / Activation of the pre-replicative complex / nuclear pre-replicative complex / nucleosome organization / Activation of ATR in response to replication stress ...CDC6 association with the ORC:origin complex / Cul8-RING ubiquitin ligase complex / maintenance of rDNA / Assembly of the ORC complex at the origin of replication / nuclear origin of replication recognition complex / pre-replicative complex assembly involved in nuclear cell cycle DNA replication / Activation of the pre-replicative complex / nuclear pre-replicative complex / nucleosome organization / Activation of ATR in response to replication stress / DNA replication preinitiation complex / mitotic DNA replication checkpoint signaling / silent mating-type cassette heterochromatin formation / Orc1 removal from chromatin / regulation of DNA replication / DNA replication origin binding / DNA replication initiation / subtelomeric heterochromatin formation / nucleosome binding / chromosome, telomeric region / chromatin binding / ATP hydrolysis activity / nucleoplasm / ATP binding / metal ion binding / nucleus 類似検索 - 分子機能
ジャーナル: Proc Natl Acad Sci U S A / 年: 2025 タイトル: DNA bending mediated by ORC is essential for replication licensing in budding yeast. 著者: Wai Hei Lam / Daqi Yu / Qiongdan Zhang / Yuhan Lin / Ningning Li / Jian Li / Yue Wu / Yingyi Zhang / Ning Gao / Bik Kwoon Tye / Yuanliang Zhai / Shangyu Dang / 要旨: In eukaryotes, the origin recognition complex (ORC) promotes the assembly of minichromosome maintenance 2 to 7 complexes into a head-to-head double hexamer at origin DNA in a process known as ...In eukaryotes, the origin recognition complex (ORC) promotes the assembly of minichromosome maintenance 2 to 7 complexes into a head-to-head double hexamer at origin DNA in a process known as replication licensing. In this study, we present a series of cryoelectron microscopy structures of yeast ORC mutants in complex with origin DNA. We show that Orc6, the smallest subunit of ORC, utilizes its transcription factor II B-B domain to orchestrate the sequential binding of ORC to origin DNA. In addition, Orc6 plays the role of a scaffold by stabilizing the basic patch (BP) of Orc5 for ORC to capture and bend origin DNA. Importantly, disrupting DNA bending through mutating three key residues in Orc5-BP impairs ORC's ability to promote replication initiation at two points during the pre-RC assembly process. This study dissects the multifaceted role of Orc6 in orchestrating ORC's activities on DNA and underscores the vital role of DNA bending by ORC in replication licensing.