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基本情報
登録情報 | データベース: PDB / ID: 8vqh | ||||||||||||||||||||||||
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タイトル | CryoEM structure of BchN-BchB electron acceptor component protein of DPOR | ||||||||||||||||||||||||
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![]() | OXIDOREDUCTASE / Plant Protein / Electron Transfer Enzymes / Photosynthesis | ||||||||||||||||||||||||
機能・相同性 | ![]() ferredoxin:protochlorophyllide reductase (ATP-dependent) / photosynthesis, dark reaction / light-independent bacteriochlorophyll biosynthetic process / oxidoreductase activity, acting on iron-sulfur proteins as donors / oxidoreductase activity, acting on the CH-CH group of donors, iron-sulfur protein as acceptor / SUMO is conjugated to E1 (UBA2:SAE1) / SUMOylation of nuclear envelope proteins / SUMO is transferred from E1 to E2 (UBE2I, UBC9) / SUMO is proteolytically processed / SUMOylation of transcription factors ...ferredoxin:protochlorophyllide reductase (ATP-dependent) / photosynthesis, dark reaction / light-independent bacteriochlorophyll biosynthetic process / oxidoreductase activity, acting on iron-sulfur proteins as donors / oxidoreductase activity, acting on the CH-CH group of donors, iron-sulfur protein as acceptor / SUMO is conjugated to E1 (UBA2:SAE1) / SUMOylation of nuclear envelope proteins / SUMO is transferred from E1 to E2 (UBE2I, UBC9) / SUMO is proteolytically processed / SUMOylation of transcription factors / SUMOylation of transcription cofactors / Postmitotic nuclear pore complex (NPC) reformation / septin ring / SUMOylation of DNA damage response and repair proteins / Transcriptional and post-translational regulation of MITF-M expression and activity / SUMOylation of DNA replication proteins / SUMOylation of SUMOylation proteins / Recruitment and ATM-mediated phosphorylation of repair and signaling proteins at DNA double strand breaks / SUMOylation of RNA binding proteins / SUMOylation of chromatin organization proteins / ubiquitin-like protein ligase binding / protein sumoylation / condensed nuclear chromosome / protein tag activity / 4 iron, 4 sulfur cluster binding / ATP binding / metal ion binding / identical protein binding / nucleus 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: 2.7 Å | ||||||||||||||||||||||||
![]() | Kashyap, R. / Antony, E. | ||||||||||||||||||||||||
資金援助 | ![]()
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![]() | ![]() タイトル: Cryo-EM captures the coordination of asymmetric electron transfer through a di-copper site in DPOR. 著者: Rajnandani Kashyap / Natalie Walsh / Jaigeeth Deveryshetty / Monika Tokmina-Lukaszewska / Kewei Zhao / Yunqiao J Gan / Brian M Hoffman / Ritimukta Sarangi / Brian Bothner / Brian Bennett / Edwin Antony / ![]() 要旨: Enzymes that catalyze long-range electron transfer (ET) reactions often function as higher order complexes that possess two structurally symmetrical halves. The functional advantages for such an ...Enzymes that catalyze long-range electron transfer (ET) reactions often function as higher order complexes that possess two structurally symmetrical halves. The functional advantages for such an architecture remain a mystery. Using cryoelectron microscopy we capture snapshots of the nitrogenase-like dark-operative protochlorophyllide oxidoreductase (DPOR) during substrate binding and turnover. DPOR catalyzes reduction of the C17 = C18 double bond in protochlorophyllide during the dark chlorophyll biosynthetic pathway. DPOR is composed of electron donor (L-protein) and acceptor (NB-protein) component proteins that transiently form a complex in the presence of ATP to facilitate ET. NB-protein is an αβ heterotetramer with two structurally identical halves. However, our structures reveal that NB-protein becomes functionally asymmetric upon substrate binding. Asymmetry results in allosteric inhibition of L-protein engagement and ET in one half. Residues that form a conduit for ET are aligned in one half while misaligned in the other. An ATP hydrolysis-coupled conformational switch is triggered once ET is accomplished in one half. These structural changes are then relayed to the other half through a di-nuclear copper center at the tetrameric interface of the NB-protein and leads to activation of ET and substrate reduction. These findings provide a mechanistic blueprint for regulation of long-range electron transfer reactions. | ||||||||||||||||||||||||
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構造の表示
構造ビューア | 分子: ![]() ![]() |
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アーカイブディレクトリ | ![]() ![]() | HTTPS FTP |
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-関連構造データ
関連構造データ | ![]() 43443MC ![]() 8vqiC ![]() 8vqjC ![]() 9buoC ![]() 9e7hC ![]() 9efuC M: このデータのモデリングに利用したマップデータ C: 同じ文献を引用 ( |
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類似構造データ | 類似検索 - 機能・相同性 ![]() |
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集合体
登録構造単位 | ![]()
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要素
#1: タンパク質 | 分子量: 46188.773 Da / 分子数: 2 / 由来タイプ: 組換発現 由来: (組換発現) ![]() 遺伝子: bchN, RSKD131_1611 / 発現宿主: ![]() ![]() 参照: UniProt: B9KK24, ferredoxin:protochlorophyllide reductase (ATP-dependent) #2: タンパク質 | 分子量: 69448.922 Da / 分子数: 2 / 由来タイプ: 組換発現 由来: (組換発現) ![]() 遺伝子: SMT3, YDR510W, D9719.15, bchB, RHOS4_18910, RSP_0286 発現宿主: ![]() ![]() 参照: UniProt: Q12306, UniProt: Q9Z5D9, ferredoxin:protochlorophyllide reductase (ATP-dependent) #3: 化合物 | #4: 化合物 | #5: 水 | ChemComp-HOH / | 研究の焦点であるリガンドがあるか | Y | Has protein modification | N | |
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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: 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: CryoEM structure of BchN-BchB electron acceptor component protein of DPOR タイプ: COMPLEX / Entity ID: #1-#2 / 由来: RECOMBINANT |
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分子量 | 値: 0.236 MDa / 実験値: NO |
由来(天然) | 生物種: ![]() |
由来(組換発現) | 生物種: ![]() ![]() |
緩衝液 | pH: 7.5 |
試料 | 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES |
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: 277.15 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: TFS KRIOS |
電子銃 | 電子線源: ![]() |
電子レンズ | モード: BRIGHT FIELD / 倍率(公称値): 105000 X / 最大 デフォーカス(公称値): 2200 nm / 最小 デフォーカス(公称値): 1000 nm / Cs: 2.7 mm / C2レンズ絞り径: 70 µm |
撮影 | 電子線照射量: 50 e/Å2 フィルム・検出器のモデル: GATAN K3 BIOQUANTUM (6k x 4k) |
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解析
CTF補正 | タイプ: NONE | ||||||||||||||||||||||||
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対称性 | 点対称性: C1 (非対称) | ||||||||||||||||||||||||
3次元再構成 | 解像度: 2.7 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 160048 / 対称性のタイプ: POINT | ||||||||||||||||||||||||
精密化 | 最高解像度: 2.7 Å 立体化学のターゲット値: REAL-SPACE (WEIGHTED MAP SUM AT ATOM CENTERS) | ||||||||||||||||||||||||
拘束条件 |
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