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基本情報
登録情報 | データベース: PDB / ID: 6gdi | ||||||
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タイトル | Structure of P-glycoprotein(ABCB1) in the post-hydrolytic state | ||||||
![]() | Multidrug resistance protein 1A | ||||||
![]() | MEMBRANE PROTEIN / P-glycoprotein / ABCB1 / ATP-binding cassette / transporter / protein structure | ||||||
機能・相同性 | ![]() hormone transport / cellular response to nonylphenol / cellular response to borneol / response to codeine / response to cyclosporin A / Atorvastatin ADME / cellular response to mycotoxin / daunorubicin transport / positive regulation of response to drug / negative regulation of sensory perception of pain ...hormone transport / cellular response to nonylphenol / cellular response to borneol / response to codeine / response to cyclosporin A / Atorvastatin ADME / cellular response to mycotoxin / daunorubicin transport / positive regulation of response to drug / negative regulation of sensory perception of pain / positive regulation of establishment of Sertoli cell barrier / regulation of intestinal absorption / response to quercetin / cellular response to external biotic stimulus / response to antineoplastic agent / Prednisone ADME / terpenoid transport / ceramide floppase activity / establishment of blood-retinal barrier / response to glycoside / protein localization to bicellular tight junction / ceramide translocation / floppase activity / ABC-family proteins mediated transport / response to thyroxine / establishment of blood-brain barrier / phosphatidylethanolamine flippase activity / phosphatidylcholine floppase activity / cellular response to L-glutamate / xenobiotic transport across blood-brain barrier / xenobiotic detoxification by transmembrane export across the plasma membrane / intercellular canaliculus / response to vitamin D / export across plasma membrane / P-type phospholipid transporter / ABC-type xenobiotic transporter / response to alcohol / response to vitamin A / response to glucagon / intestinal absorption / ABC-type xenobiotic transporter activity / cellular response to antibiotic / phospholipid translocation / cellular hyperosmotic salinity response / cellular response to alkaloid / maintenance of blood-brain barrier / efflux transmembrane transporter activity / xenobiotic transmembrane transporter activity / transmembrane transporter activity / ATPase-coupled transmembrane transporter activity / response to cadmium ion / lactation / cellular response to dexamethasone stimulus / response to progesterone / female pregnancy / placenta development / cellular response to estradiol stimulus / brush border membrane / circadian rhythm / cellular response to tumor necrosis factor / cellular response to lipopolysaccharide / response to hypoxia / apical plasma membrane / response to xenobiotic stimulus / ATP hydrolysis activity / ATP binding / plasma membrane / 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: 7.9 Å | ||||||
![]() | Ford, R.C. / Thonghin, N. / Collins, R.F. / Barbieri, A. / Shafi, T. / Siebert, A. | ||||||
![]() | ![]() タイトル: Novel features in the structure of P-glycoprotein (ABCB1) in the post-hydrolytic state as determined at 7.9 Å resolution. 著者: Nopnithi Thonghin / Richard F Collins / Alessandro Barbieri / Talha Shafi / Alistair Siebert / Robert C Ford / ![]() 要旨: BACKGROUND: P-glycoprotein (ABCB1) is an ATP-binding cassette transporter that plays an important role in the clearance of drugs and xenobiotics and is associated with multi-drug resistance in cancer. ...BACKGROUND: P-glycoprotein (ABCB1) is an ATP-binding cassette transporter that plays an important role in the clearance of drugs and xenobiotics and is associated with multi-drug resistance in cancer. Although several P-glycoprotein structures are available, these are either at low resolution, or represent mutated and/or quiescent states of the protein. RESULTS: In the post-hydrolytic state the structure of the wild-type protein has been resolved at about 8 Å resolution. The cytosolic nucleotide-binding domains (NBDs) are separated but ADP ...RESULTS: In the post-hydrolytic state the structure of the wild-type protein has been resolved at about 8 Å resolution. The cytosolic nucleotide-binding domains (NBDs) are separated but ADP remains bound, especially at the first NBD. Gaps in the transmembrane domains (TMDs) that connect to an inner hydrophilic cavity are filled by density emerging from the annular detergent micelle. The NBD-TMD linker is partly resolved, being located between the NBDs and close to the Signature regions involved in cooperative NBD dimerization. This, and the gap-filling detergent suggest steric impediment to NBD dimerization in the post-hydrolytic state. Two central regions of density lie in two predicted drug-binding sites, implying that the protein may adventitiously bind hydrophobic substances even in the post-hydrolytic state. The previously unresolved N-terminal extension was observed, and the data suggests these 30 residues interact with the headgroup region of the lipid bilayer. CONCLUSION: The structural data imply that (i) a low basal ATPase activity is ensured by steric blockers of NBD dimerization and (ii) allocrite access to the central cavity may be structurally linked ...CONCLUSION: The structural data imply that (i) a low basal ATPase activity is ensured by steric blockers of NBD dimerization and (ii) allocrite access to the central cavity may be structurally linked to NBD dimerization, giving insights into the mechanism of drug-stimulation of P-glycoprotein activity. | ||||||
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構造ビューア | 分子: ![]() ![]() |
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PDBx/mmCIF形式 | ![]() | 212.1 KB | 表示 | ![]() |
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-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
#1: タンパク質 | 分子量: 141877.875 Da / 分子数: 1 / 由来タイプ: 組換発現 / 由来: (組換発現) ![]() ![]() ![]() |
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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: mouse P-glycoprotein / タイプ: COMPLEX / Entity ID: all / 由来: RECOMBINANT |
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分子量 | 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 |
試料 | 濃度: 1.1 mg/ml / 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES |
試料支持 | グリッドの材料: GOLD / グリッドのサイズ: 200 divisions/in. / グリッドのタイプ: Quantifoil R1.2/1.3 |
急速凍結 | 装置: FEI VITROBOT MARK IV / 凍結剤: ETHANE / 湿度: 95 % / 凍結前の試料温度: 295 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 |
撮影 | 電子線照射量: 70 e/Å2 フィルム・検出器のモデル: GATAN K2 SUMMIT (4k x 4k) |
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解析
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CTF補正 | タイプ: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||
3次元再構成 | 解像度: 7.9 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 135357 / クラス平均像の数: 18 / 対称性のタイプ: POINT | ||||||||||||||||
原子モデル構築 | プロトコル: FLEXIBLE FIT | ||||||||||||||||
原子モデル構築 | PDB-ID: 4KSB PDB chain-ID: a / Accession code: 4KSB / Pdb chain residue range: 33-1271 / Source name: PDB / タイプ: experimental model |