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基本情報
登録情報 | データベース: PDB / ID: 8rif | |||||||||||||||||||||
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タイトル | Cryo-EM structure of the MCM double hexamer loaded onto dsDNA. | |||||||||||||||||||||
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![]() | REPLICATION / MCM helicase / DNA replication | |||||||||||||||||||||
機能・相同性 | ![]() 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 / replication fork protection complex / pre-replicative complex assembly involved in nuclear cell cycle DNA replication / mitotic DNA replication / Activation of the pre-replicative 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 / replication fork protection complex / pre-replicative complex assembly involved in nuclear cell cycle DNA replication / mitotic DNA replication / Activation of the pre-replicative complex / CMG complex / nuclear pre-replicative complex / Activation of ATR in response to replication stress / DNA replication preinitiation complex / MCM complex / double-strand break repair via break-induced replication / mitotic DNA replication initiation / single-stranded DNA helicase activity / regulation of DNA-templated DNA replication initiation / silent mating-type cassette heterochromatin formation / DNA strand elongation involved in DNA replication / nuclear replication fork / DNA replication origin binding / DNA replication initiation / subtelomeric heterochromatin formation / DNA helicase activity / transcription elongation by RNA polymerase II / helicase activity / heterochromatin formation / single-stranded DNA binding / DNA helicase / chromosome, telomeric region / DNA replication / DNA damage response / chromatin binding / ATP hydrolysis activity / zinc ion binding / nucleoplasm / ATP binding / nucleus / cytoplasm 類似検索 - 分子機能 | |||||||||||||||||||||
生物種 | ![]() ![]() | |||||||||||||||||||||
手法 | 電子顕微鏡法 / 単粒子再構成法 / クライオ電子顕微鏡法 / 解像度: 2.79 Å | |||||||||||||||||||||
![]() | Miller, T.C.R. / Lim, C.T. / Diffley, J.F.X. / Costa, A. | |||||||||||||||||||||
資金援助 | ![]() ![]()
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![]() | ![]() タイトル: Cell cycle regulation has shaped replication origins in budding yeast. 著者: Chew Theng Lim / Thomas C R Miller / Kang Wei Tan / Saurabh Talele / Anne Early / Philip East / Humberto Sánchez / Nynke H Dekker / Alessandro Costa / John F X Diffley / ![]() ![]() ![]() 要旨: Eukaryotic DNA replication initiates from genomic loci known as origins. At budding yeast origins like ARS1, a double hexamer (DH) of the MCM replicative helicase is assembled by origin recognition ...Eukaryotic DNA replication initiates from genomic loci known as origins. At budding yeast origins like ARS1, a double hexamer (DH) of the MCM replicative helicase is assembled by origin recognition complex (ORC), Cdc6 and Cdt1 by sequential hexamer loading from two opposed ORC binding sites. Cyclin-dependent kinase (CDK) inhibits DH assembly, which prevents re-replication by restricting helicase loading to the G1 phase. Here, we show that an intrinsically disordered region (IDR) in the Orc2 subunit promotes interaction between ORC and the first loaded, closed-ring MCM hexamer (the MCM-ORC (MO) intermediate). CDK-dependent phosphorylation of this IDR blocks MO formation and DH assembly. We show that MO stabilizes ORC at lower-affinity binding sites required for second hexamer loading. Origins comprising two high-affinity ORC sites can assemble DH efficiently without MO by independently loading single hexamers. Strikingly, these origins escape CDK inhibition in vitro and in vivo. Our work reveals mechanistic plasticity in MCM loading with implications for understanding how CDK regulation has shaped yeast origin evolution and how natural, strong origins might escape cell cycle regulation. We also identify key steps common to loading pathways, with implications for understanding how MCM is loaded in other eukaryotes. | |||||||||||||||||||||
履歴 |
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構造の表示
構造ビューア | 分子: ![]() ![]() |
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ダウンロードとリンク
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ダウンロード
PDBx/mmCIF形式 | ![]() | 1.4 MB | 表示 | ![]() |
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PDB形式 | ![]() | 表示 | ![]() | |
PDBx/mmJSON形式 | ![]() | ツリー表示 | ![]() | |
その他 | ![]() |
-検証レポート
文書・要旨 | ![]() | 1.8 MB | 表示 | ![]() |
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文書・詳細版 | ![]() | 1.9 MB | 表示 | |
XML形式データ | ![]() | 195.9 KB | 表示 | |
CIF形式データ | ![]() | 307.4 KB | 表示 | |
アーカイブディレクトリ | ![]() ![]() | HTTPS FTP |
-関連構造データ
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リンク
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集合体
登録構造単位 | ![]()
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要素
-DNA replication licensing factor ... , 5種, 10分子 2A3B4C6E7F
#1: タンパク質 | 分子量: 98911.539 Da / 分子数: 2 / 由来タイプ: 組換発現 由来: (組換発現) ![]() ![]() 遺伝子: MCM2, YBL023C, YBL0438 / 発現宿主: ![]() ![]() #2: タンパク質 | 分子量: 111720.242 Da / 分子数: 2 / 由来タイプ: 組換発現 由来: (組換発現) ![]() ![]() 遺伝子: MCM3, YEL032W, SYGP-ORF23 / 発現宿主: ![]() ![]() #3: タンパク質 | 分子量: 105138.375 Da / 分子数: 2 / 由来タイプ: 組換発現 由来: (組換発現) ![]() ![]() 遺伝子: MCM4, CDC54, HCD21, YPR019W, YP9531.13 / 発現宿主: ![]() ![]() #5: タンパク質 | 分子量: 113110.211 Da / 分子数: 2 / 由来タイプ: 組換発現 由来: (組換発現) ![]() ![]() 遺伝子: MCM6, YGL201C / 発現宿主: ![]() ![]() #6: タンパク質 | 分子量: 95049.875 Da / 分子数: 2 / 由来タイプ: 組換発現 由来: (組換発現) ![]() ![]() 遺伝子: MCM7, CDC47, YBR202W, YBR1441 / 発現宿主: ![]() ![]() |
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-タンパク質 , 1種, 2分子 5D
#4: タンパク質 | 分子量: 86505.734 Da / 分子数: 2 / 由来タイプ: 組換発現 由来: (組換発現) ![]() ![]() 遺伝子: MCM5, CDC46, YLR274W, L9328.1 / 発現宿主: ![]() ![]() |
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-DNA鎖 , 2種, 2分子 XY
#7: DNA鎖 | 分子量: 16326.441 Da / 分子数: 1 / 由来タイプ: 合成 / 由来: (合成) ![]() ![]() |
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#8: DNA鎖 | 分子量: 16335.457 Da / 分子数: 1 / 由来タイプ: 合成 / 由来: (合成) ![]() ![]() |
-非ポリマー , 4種, 26分子 






#9: 化合物 | #10: 化合物 | ChemComp-MG / #11: 化合物 | ChemComp-ZN / #12: 化合物 | ChemComp-ADP / |
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-詳細
研究の焦点であるリガンドがあるか | Y |
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Has protein modification | N |
-実験情報
-実験
実験 | 手法: 電子顕微鏡法 |
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EM実験 | 試料の集合状態: PARTICLE / 3次元再構成法: 単粒子再構成法 |
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試料調製
構成要素 | 名称: MCM-double hexamer loaded onto double-stranded DNA / タイプ: COMPLEX / Entity ID: #1-#8 / 由来: RECOMBINANT |
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分子量 | 値: 1.2 MDa |
由来(天然) | 生物種: ![]() ![]() |
由来(組換発現) | 生物種: ![]() ![]() |
緩衝液 | pH: 7.6 |
試料 | 濃度: 0.05 mg/ml / 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES 詳細: Complete biochemical reaction containing the MCM helicase in complex with Cdt1, the helicase loader (the origin recognition complex), the co-factor Cdc6, an origin or replication (DNA) ...詳細: Complete biochemical reaction containing the MCM helicase in complex with Cdt1, the helicase loader (the origin recognition complex), the co-factor Cdc6, an origin or replication (DNA) flanked by nucleosomes, the regulatory kinase CDK and an inhibitor of CDK (Sic1). The sample was incubated with ATP yielding a range of structural intermediates in the MCM loading pathway. |
急速凍結 | 装置: FEI VITROBOT MARK IV / 凍結剤: ETHANE / 湿度: 100 % / 凍結前の試料温度: 283 K |
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電子顕微鏡撮影
実験機器 | ![]() モデル: Titan Krios / 画像提供: FEI Company |
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顕微鏡 | モデル: FEI TITAN KRIOS |
電子銃 | 電子線源: ![]() |
電子レンズ | モード: BRIGHT FIELD / 倍率(公称値): 130000 X / 最大 デフォーカス(公称値): 4500 nm / 最小 デフォーカス(公称値): 1500 nm / Cs: 2.7 mm / C2レンズ絞り径: 50 µm |
撮影 | 電子線照射量: 51.2 e/Å2 / 検出モード: COUNTING フィルム・検出器のモデル: GATAN K2 SUMMIT (4k x 4k) 実像数: 24506 |
電子光学装置 | エネルギーフィルタースリット幅: 20 eV |
画像スキャン | 動画フレーム数/画像: 40 / 利用したフレーム数/画像: 1-40 |
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解析
EMソフトウェア |
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CTF補正 | タイプ: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||||||||||||||||||||||||||||
粒子像の選択 | 選択した粒子像数: 178188 詳細: MCM-DH particles after first 2D classification from a dataset containing multiple molecular species (e.g. ORC, MCM-SH, MCM-DH) | ||||||||||||||||||||||||||||||||||||||||||||||||||
対称性 | 点対称性: C2 (2回回転対称) | ||||||||||||||||||||||||||||||||||||||||||||||||||
3次元再構成 | 解像度: 2.79 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 135143 / クラス平均像の数: 1 / 対称性のタイプ: POINT | ||||||||||||||||||||||||||||||||||||||||||||||||||
原子モデル構築 | PDB-ID: 7P30 Accession code: 7P30 / Source name: PDB / タイプ: experimental model |