+データを開く
-基本情報
登録情報 | データベース: PDB / ID: 4c3g | ||||||
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タイトル | cryo-EM structure of activated and oligomeric restriction endonuclease SgrAI | ||||||
要素 |
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キーワード | HYDROLASE / RESTRICTION ENDONUCLEASE / ALLOSTERY / DNA CLEAVAGE / PARASITE-HOST INTERACTION | ||||||
機能・相同性 | Restriction endonuclease, type II, Cfr10I/Bse634I / Cfr10I/Bse634I restriction endonuclease / Restriction endonuclease type II-like / identical protein binding / metal ion binding / DNA / DNA (> 10) / SgraIR restriction enzyme 機能・相同性情報 | ||||||
生物種 | STREPTOMYCES GRISEUS (ストレプトマイシン生産菌) | ||||||
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: 8.6 Å | ||||||
Model type details | CA ATOMS ONLY, CHAIN A, B | ||||||
データ登録者 | Lyumkis, D. / Talley, H. / Stewart, A. / Shah, S. / Park, C.K. / Tama, F. / Potter, C.S. / Carragher, B. / Horton, N.C. | ||||||
引用 | ジャーナル: Structure / 年: 2013 タイトル: Allosteric regulation of DNA cleavage and sequence-specificity through run-on oligomerization. 著者: Dmitry Lyumkis / Heather Talley / Andrew Stewart / Santosh Shah / Chad K Park / Florence Tama / Clinton S Potter / Bridget Carragher / Nancy C Horton / 要旨: SgrAI is a sequence specific DNA endonuclease that functions through an unusual enzymatic mechanism that is allosterically activated 200- to 500-fold by effector DNA, with a concomitant expansion of ...SgrAI is a sequence specific DNA endonuclease that functions through an unusual enzymatic mechanism that is allosterically activated 200- to 500-fold by effector DNA, with a concomitant expansion of its DNA sequence specificity. Using single-particle transmission electron microscopy to reconstruct distinct populations of SgrAI oligomers, we show that in the presence of allosteric, activating DNA, the enzyme forms regular, repeating helical structures characterized by the addition of DNA-binding dimeric SgrAI subunits in a run-on manner. We also present the structure of oligomeric SgrAI at 8.6 Å resolution, demonstrating the conformational state of SgrAI in its activated form. Activated and oligomeric SgrAI displays key protein-protein interactions near the helix axis between its N termini, as well as allosteric protein-DNA interactions that are required for enzymatic activation. The hybrid approach reveals an unusual mechanism of enzyme activation that explains SgrAI's oligomerization and allosteric behavior. | ||||||
履歴 |
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-構造の表示
ムービー |
ムービービューア |
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構造ビューア | 分子: MolmilJmol/JSmol |
-ダウンロードとリンク
-ダウンロード
PDBx/mmCIF形式 | 4c3g.cif.gz | 60.2 KB | 表示 | PDBx/mmCIF形式 |
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PDB形式 | pdb4c3g.ent.gz | 35.2 KB | 表示 | PDB形式 |
PDBx/mmJSON形式 | 4c3g.json.gz | ツリー表示 | PDBx/mmJSON形式 | |
その他 | その他のダウンロード |
-検証レポート
文書・要旨 | 4c3g_validation.pdf.gz | 796.7 KB | 表示 | wwPDB検証レポート |
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文書・詳細版 | 4c3g_full_validation.pdf.gz | 797.8 KB | 表示 | |
XML形式データ | 4c3g_validation.xml.gz | 17.2 KB | 表示 | |
CIF形式データ | 4c3g_validation.cif.gz | 24.7 KB | 表示 | |
アーカイブディレクトリ | https://data.pdbj.org/pub/pdb/validation_reports/c3/4c3g ftp://data.pdbj.org/pub/pdb/validation_reports/c3/4c3g | HTTPS FTP |
-関連構造データ
-リンク
-集合体
登録構造単位 |
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-要素
#1: タンパク質 | 分子量: 37884.855 Da / 分子数: 2 / 断片: DNA-BINDING DOMAIN, RESIDUES 2-338 / 由来タイプ: 組換発現 詳細: AN SGRAI DIMER. THE OLIGOMERIC HELIX IS FORMED FROM MULTIPLE COPIES OF SUCH SGRAI DIMERS BOUND TO DNA. 由来: (組換発現) STREPTOMYCES GRISEUS (ストレプトマイシン生産菌) プラスミド: PET21A_SGRA1R / 発現宿主: ESCHERICHIA COLI (大腸菌) / 株 (発現宿主): ER2566 / 参照: UniProt: Q9F6L0 #2: DNA鎖 | 分子量: 5547.588 Da / 分子数: 2 / 由来タイプ: 合成 詳細: 2 COPIES OF PRE-CLEAVED DNA CONTAINING STICKY ENDS AND THE SGRAI RECOGNITION SEQUENCE 由来: (合成) STREPTOMYCES GRISEUS (ストレプトマイシン生産菌) #3: DNA鎖 | 分子量: 6722.343 Da / 分子数: 2 / 由来タイプ: 合成 詳細: 2 COPIES OF PRE-CLEAVED DNA CONTAINING STICKY ENDS AND THE SGRAI RECOGNITION SEQUENCE 由来: (合成) STREPTOMYCES GRISEUS (ストレプトマイシン生産菌) |
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-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: HELICAL ARRAY / 3次元再構成法: 単粒子再構成法 |
-試料調製
構成要素 | 名称: HELICAL ASYMMETRIC UNIT OF AN SGRAI DNA-BOUND DIMER / タイプ: COMPLEX |
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緩衝液 | 名称: 10 MM TRIS-HCL PH 8.0, 150 MM NACL, 5 MM CA(OAC) 2, 0.5 MM DTT pH: 8 詳細: 10 MM TRIS-HCL PH 8.0, 150 MM NACL, 5 MM CA(OAC) 2, 0.5 MM DTT |
試料 | 濃度: 0.2 mg/ml / 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES |
試料支持 | 詳細: HOLEY CARBON |
急速凍結 | 装置: HOMEMADE PLUNGER / 凍結剤: ETHANE 詳細: SPECIMENS WERE PREPARED FOR CRYO-EM BY APPLYING 3 MICROLITERS OF SAMPLE IN BINDING BUFFER TO A HOLEY CARBON C-FLAT GRID (CF-2- 2-400) (PROTOCHIPS, INC.) THAT HAD BEEN PLASMA CLEANED (GATAN, ...詳細: SPECIMENS WERE PREPARED FOR CRYO-EM BY APPLYING 3 MICROLITERS OF SAMPLE IN BINDING BUFFER TO A HOLEY CARBON C-FLAT GRID (CF-2- 2-400) (PROTOCHIPS, INC.) THAT HAD BEEN PLASMA CLEANED (GATAN, SOLARUS) FOR 5 SEC. THE SAMPLE WAS ALLOWED TO ADSORB TO THE GRID FOR 30 SEC., THEN PLUNGE-FROZEN INTO LIQUID ETHANE USING A MANUAL CRYO-PLUNGER AT 4 C. |
-電子顕微鏡撮影
実験機器 | モデル: Tecnai F20 / 画像提供: FEI Company |
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顕微鏡 | モデル: FEI TECNAI F20 / 日付: 2012年9月19日 |
電子銃 | 電子線源: FIELD EMISSION GUN / 加速電圧: 200 kV / 照射モード: FLOOD BEAM |
電子レンズ | モード: BRIGHT FIELD / 倍率(公称値): 60000 X / 倍率(補正後): 41000 X / 最大 デフォーカス(公称値): 3000 nm / 最小 デフォーカス(公称値): 1000 nm / Cs: 2 mm |
撮影 | 電子線照射量: 16 e/Å2 フィルム・検出器のモデル: DIRECT ELECTRON DE-12 (4k x 3k) |
画像スキャン | デジタル画像の数: 656 |
放射波長 | 相対比: 1 |
-解析
EMソフトウェア |
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CTF補正 | 詳細: INDIVIDUAL PARTICLES | ||||||||||||
3次元再構成 | 手法: PROJECTION-MATCHING / 解像度: 8.6 Å / 粒子像の数: 1918 / ピクセルサイズ(公称値): 1.42 Å / ピクセルサイズ(実測値): 1.42 Å / 倍率補正: CATALASE CRYSTALS 詳細: WE FIRST CONDUCTED 25 ITERATIONS OF THE IHRSR ROUTINE TO REFINE THE FULL CRYODATA SET AND OBTAIN FINAL HELICAL PARAMETERS -- -86.2 HELICAL TWIST AND 21.6 A RISE. SUBSEQUENTLY, THE MODEL FROM ...詳細: WE FIRST CONDUCTED 25 ITERATIONS OF THE IHRSR ROUTINE TO REFINE THE FULL CRYODATA SET AND OBTAIN FINAL HELICAL PARAMETERS -- -86.2 HELICAL TWIST AND 21.6 A RISE. SUBSEQUENTLY, THE MODEL FROM IHRSR WAS USED FOR REFINEMENT IN FREALIGN SPECIFYING DIFFERENT DOSE- -FRACTIONATED STACKS FOR THE REFINEMENT (32 E- PER A2) AND RECONSTRUCTION (16 E- PER A2) ROUTINES. THE FINAL RECONSTRUCTION WAS OBTAINED FROM 1,918 FILAMENT SEGMENTS, AVERAGED 8 TIMES TO ACCOUNT FOR THE HELICAL SYMMETRY BASES WERE OMITTED FROM THE FITTED DNA. ONLY THE PHOSPHATE-SUGAR BACKBONE IS SHOWN. SUBMISSION BASED ON EXPERIMENTAL DATA FROM EMDB EMD-2441. (DEPOSITION ID: 11901). 対称性のタイプ: HELICAL | ||||||||||||
原子モデル構築 | プロトコル: FLEXIBLE FIT / 空間: REAL / 詳細: METHOD--DIREX REFINEMENT PROTOCOL--FLEXIBLE | ||||||||||||
原子モデル構築 | PDB-ID: 3DVO Accession code: 3DVO / Source name: PDB / タイプ: experimental model | ||||||||||||
精密化 | 最高解像度: 8.6 Å | ||||||||||||
精密化ステップ | サイクル: LAST / 最高解像度: 8.6 Å
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