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データを開く
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基本情報
登録情報 | データベース: PDB / ID: 9nfi | ||||||
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タイトル | Tuna P-glycoprotein Apo Conformation 1 | ||||||
![]() | Permeability Glycoprotein (P-gp) | ||||||
![]() | TRANSPORT PROTEIN / ABC Transporter / Membrane protein / Structural Genomics / PSI-Biology / Center for Structures of Membrane Proteins / CSMP | ||||||
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: 3.79 Å | ||||||
![]() | Young, M.A. / Rees, S.D. / Nicklisch, S.C.T. / Stowell, M. / Hamdoun, A. / Chang, G. / Center for Structures of Membrane Proteins (CSMP) | ||||||
資金援助 | ![]()
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![]() | ![]() タイトル: Cryo-EM Structures of Apo and DDT-Bound P-Glycoprotein in Yellowfin Tuna. 著者: Megan A Young / Steven D Rees / Sascha C T Nicklisch / Michael H B Stowell / Amro Hamdoun / Geoffrey Chang / ![]() 要旨: Persistent pollutants in the ocean impact the safety of seafood. Many emerging and legacy persistent organic pollutants (POPs) have been disposed into the world's oceans, exemplified by the recent ...Persistent pollutants in the ocean impact the safety of seafood. Many emerging and legacy persistent organic pollutants (POPs) have been disposed into the world's oceans, exemplified by the recent discovery of large amounts of the halogenated pesticide dichlorodiphenyltrichloroethane (DDT) waste in the waters of Southern California. The biological mechanisms governing persistence and trophic transfer of marine pollutants into seafood species remain incompletely understood. Xenobiotic transporters, such as P-glycoprotein (P-gp), are present in all organisms and prevent the accumulation of toxic chemicals. Our previous work has demonstrated that halogenated marine pollutants can act as inhibitors of human and murine P-gp transporters by interacting with their binding site and impeding transport. Using cryo-EM, we determined the molecular interactions of DDT with P-glycoprotein from yellowfin tuna (). The results reveal that the conformation of the transporter samples multiple degrees of widening in the absence of substrate. We also show that DDT binds in a singular, wide inward-facing conformation that could inhibit the transport cycle. This transporter inhibition may contribute to the bioaccumulation of DDT in tuna. This study highlights the capacity of persistent organic pollutants to act at multiple points in the food chain to inhibit this critical transport mechanism. | ||||||
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構造の表示
構造ビューア | 分子: ![]() ![]() |
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PDBx/mmCIF形式 | ![]() | 203.5 KB | 表示 | ![]() |
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PDB形式 | ![]() | 159.8 KB | 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 MB | 表示 | ![]() |
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文書・詳細版 | ![]() | 1.1 MB | 表示 | |
XML形式データ | ![]() | 37.7 KB | 表示 | |
CIF形式データ | ![]() | 57.3 KB | 表示 | |
アーカイブディレクトリ | ![]() ![]() | HTTPS FTP |
-関連構造データ
関連構造データ | ![]() 49366MC ![]() 9nfjC ![]() 9nfkC ![]() 9nflC ![]() 9nfmC 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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その他のデータベース |
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リンク
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集合体
登録構造単位 | ![]()
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1 |
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要素
#1: タンパク質 | 分子量: 144680.500 Da / 分子数: 1 / 変異: N101Q, N104Q, N109Q, and N116Q / 由来タイプ: 組換発現 / 由来: (組換発現) ![]() ![]() |
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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: 2D ARRAY / 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: ABC transporter from yellowfin tuna / タイプ: COMPLEX / Entity ID: all / 由来: RECOMBINANT | |||||||||||||||||||||||||
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分子量 | 値: 1.43 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: 8 詳細: 50 mM HEPES pH 8, 150 mM NaCl, 0.02% LMNG, 1mM MgCl2 | |||||||||||||||||||||||||
緩衝液成分 |
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試料 | 濃度: 1 mg/ml / 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES 詳細: Vitrified, monodisperse sample of transporter proteins in detergent micelles | |||||||||||||||||||||||||
試料支持 | グリッドの材料: COPPER / グリッドのサイズ: 400 divisions/in. / グリッドのタイプ: SPT Labtech self-wicking R1.2/0.8 | |||||||||||||||||||||||||
急速凍結 | 装置: SPT LABTECH CHAMELEON / 凍結剤: ETHANE / 湿度: 95 % / 凍結前の試料温度: 277 K 詳細: The grids were glow discharged for 80sec at 12mA, with a relative humidity of 82% and temperature 21.5oC maintained throughout preparation. Samples of purified protein were concentrated to ...詳細: The grids were glow discharged for 80sec at 12mA, with a relative humidity of 82% and temperature 21.5oC maintained throughout preparation. Samples of purified protein were concentrated to 1mg/mL and ultracentrifuged in a Beckmann Optima Ultracentrifuge for 15 minutes prior to grid preparation. The sample was applied via 2-S application mode by the Chameleon, allowed to wick for 530ms via the grid nanowires, and subsequently plunged into liquid ethane maintained at -180oC. |
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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 / 最大 デフォーカス(公称値): 2000 nm / 最小 デフォーカス(公称値): 1000 nm |
撮影 | 電子線照射量: 55 e/Å2 フィルム・検出器のモデル: FEI FALCON IV (4k x 4k) |
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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: 4800000 | ||||||||||||||||||||||||
対称性 | 点対称性: C1 (非対称) | ||||||||||||||||||||||||
3次元再構成 | 解像度: 3.79 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 98100 / 対称性のタイプ: POINT | ||||||||||||||||||||||||
原子モデル構築 | B value: 131 / プロトコル: RIGID BODY FIT / 空間: REAL | ||||||||||||||||||||||||
原子モデル構築 | 詳細: The initial model was predicted using AlphaFold 2 software. Source name: AlphaFold / タイプ: in silico model |