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基本情報
登録情報 | データベース: EMDB / ID: EMD-2715 | |||||||||
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タイトル | Electron cryo-microscopy of ABCG2 from two-dimensional crystals | |||||||||
![]() | Non-crystallographic symmetry averaging around the local C2 symmetry axis was applied to the raw ABCG2 map. | |||||||||
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![]() | ABCG2 / BCRP / Cryo-EM / 3D structure / ABC transporter | |||||||||
機能・相同性 | ![]() response to xenobiotic stimulus => GO:0009410 / transport / small molecule metabolic process / biotin transmembrane transporter activity / biotin transport / riboflavin transport / riboflavin transmembrane transporter activity / heme transport / sphingolipid transporter activity / renal urate salt excretion ...response to xenobiotic stimulus => GO:0009410 / transport / small molecule metabolic process / biotin transmembrane transporter activity / biotin transport / riboflavin transport / riboflavin transmembrane transporter activity / heme transport / sphingolipid transporter activity / renal urate salt excretion / Abacavir transmembrane transport / urate metabolic process / urate transmembrane transporter activity / sphingolipid biosynthetic process / Sphingolipid de novo biosynthesis / external side of apical plasma membrane / organic anion transport / xenobiotic transmembrane transport / xenobiotic transport across blood-brain barrier / organic anion transmembrane transporter activity / transepithelial transport / Ciprofloxacin ADME / export across plasma membrane / Paracetamol ADME / NFE2L2 regulating MDR associated enzymes / ABC-type xenobiotic transporter / Differentiation of Keratinocytes in Interfollicular Epidermis in Mammalian Skin / Heme biosynthesis / cellular detoxification / ABC-type xenobiotic transporter activity / xenobiotic transport / Heme degradation / efflux transmembrane transporter activity / xenobiotic transmembrane transporter activity / ATPase-coupled transmembrane transporter activity / transport across blood-brain barrier / Iron uptake and transport / brush border membrane / mitochondrial membrane / transmembrane transport / intracellular iron ion homeostasis / apical plasma membrane / membrane raft / protein homodimerization activity / ATP hydrolysis activity / nucleoplasm / ATP binding / identical protein binding / plasma membrane 類似検索 - 分子機能 | |||||||||
生物種 | ![]() | |||||||||
手法 | 電子線結晶学 / クライオ電子顕微鏡法 / ネガティブ染色法 / 解像度: 18.0 Å | |||||||||
![]() | Rosenberg MF / Bikadi Z / Hazai E / Starborg T / Kelley L / Chayen NE / Ford RC / Mao Q | |||||||||
![]() | ![]() タイトル: Three-dimensional structure of the human breast cancer resistance protein (BCRP/ABCG2) in an inward-facing conformation. 著者: Mark F Rosenberg / Zsolt Bikadi / Eszter Hazai / Tobias Starborg / Lawrence Kelley / Naomi E Chayen / Robert C Ford / Qingcheng Mao / ![]() ![]() ![]() 要旨: ABCG2 is an efflux drug transporter that plays an important role in drug resistance and drug disposition. In this study, the first three-dimensional structure of human full-length ABCG2 analysed by ...ABCG2 is an efflux drug transporter that plays an important role in drug resistance and drug disposition. In this study, the first three-dimensional structure of human full-length ABCG2 analysed by electron crystallography from two-dimensional crystals in the absence of nucleotides and transported substrates is reported at 2 nm resolution. In this state, ABCG2 forms a symmetric homodimer with a noncrystallographic twofold axis perpendicular to the two-dimensional crystal plane, as confirmed by subtomogram averaging. This configuration suggests an inward-facing configuration similar to murine ABCB1, with the nucleotide-binding domains (NBDs) widely separated from each other. In the three-dimensional map, densities representing the long cytoplasmic extensions from the transmembrane domains that connect the NBDs are clearly visible. The structural data have allowed the atomic model of ABCG2 to be refined, in which the two arms of the V-shaped ABCG2 homodimeric complex are in a more closed and narrower conformation. The structural data and the refined model of ABCG2 are compatible with the biochemical analysis of the previously published mutagenesis studies, providing novel insight into the structure and function of the transporter. | |||||||||
履歴 |
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構造の表示
ムービー |
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構造ビューア | EMマップ: ![]() ![]() ![]() |
添付画像 |
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-EMDBアーカイブ
マップデータ | ![]() | 78.5 KB | ![]() | |
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ヘッダ (付随情報) | ![]() ![]() | 13.3 KB 13.3 KB | 表示 表示 | ![]() |
画像 | ![]() | 952.3 KB | ||
アーカイブディレクトリ | ![]() ![]() | HTTPS FTP |
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類似構造データ | 類似検索 - 機能・相同性 ![]() |
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「今月の分子」の関連する項目 |
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マップ
ファイル | ![]() | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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注釈 | Non-crystallographic symmetry averaging around the local C2 symmetry axis was applied to the raw ABCG2 map. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
投影像・断面図 | 画像のコントロール
画像は Spider により作成 これらの図は立方格子座標系で作成されたものです | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
ボクセルのサイズ | X: 3.2 Å / Y: 3.2 Å / Z: 3.3 Å | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
密度 |
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対称性 | 空間群: 1 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
詳細 | EMDB XML:
CCP4マップ ヘッダ情報:
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-添付データ
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試料の構成要素
-全体 : ABCG2 (breast cancer resistance protein).
全体 | 名称: ABCG2 (breast cancer resistance protein). |
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要素 |
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-超分子 #1000: ABCG2 (breast cancer resistance protein).
超分子 | 名称: ABCG2 (breast cancer resistance protein). / タイプ: sample / ID: 1000 / 詳細: Two-dimensional crystals of purified ABCG2. / 集合状態: Homodimer / Number unique components: 1 |
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分子量 | 実験値: 70 KDa / 理論値: 70 KDa / 手法: SDS-PAGE. |
-分子 #1: ATP-binding cassette sub-family G member 2
分子 | 名称: ATP-binding cassette sub-family G member 2 / タイプ: protein_or_peptide / ID: 1 / Name.synonym: Breast cancer resistance protein 詳細: Purified ABCG2 formed two-dimensional crystals on a carbon electron microscopy grid. コピー数: 2 / 集合状態: Homodimer / 組換発現: Yes |
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由来(天然) | 生物種: ![]() |
分子量 | 実験値: 70 KDa / 理論値: 70 KDa |
組換発現 | 生物種: ![]() |
配列 | UniProtKB: Broad substrate specificity ATP-binding cassette transporter ABCG2 GO: intracellular iron ion homeostasis, xenobiotic transmembrane transport, heme transport, response to xenobiotic stimulus => GO:0009410, small molecule metabolic process, transmembrane transport, ...GO: intracellular iron ion homeostasis, xenobiotic transmembrane transport, heme transport, response to xenobiotic stimulus => GO:0009410, small molecule metabolic process, transmembrane transport, transport, urate metabolic process, xenobiotic transport InterPro: AAA+ ATPase domain, ABC-2 type transporter, ABC transporter-like, ATP-binding domain, P-loop containing nucleoside triphosphate hydrolase |
-実験情報
-構造解析
手法 | ネガティブ染色法, クライオ電子顕微鏡法 |
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![]() | 電子線結晶学 |
試料の集合状態 | 2D array |
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試料調製
濃度 | 0.3 mg/mL |
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緩衝液 | pH: 8 詳細: 50 mM Tris-HCl , 10% glycerol, 1 mM 2-mercaptoethanol, and 0.187 mg/ml DDM. |
染色 | タイプ: NEGATIVE 詳細: Some grids were negatively stained with 2 % w/v uranyl-acetate for 60 seconds. |
グリッド | 詳細: 300 mesh gold/carbon grids with thick carbon support (5-10 nm) . |
凍結 | 凍結剤: ETHANE / チャンバー内湿度: 90 % / チャンバー内温度: 98 K / 装置: FEI VITROBOT MARK III 手法: 2-D crystals growing epitaxially on the grid surface were blotted for 1 second before plunging. |
詳細 | Crystals were grown epitaxially on the surface of carbon grids. |
結晶化 | 詳細: Crystals were grown epitaxially on the surface of carbon grids. |
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電子顕微鏡法
顕微鏡 | FEI POLARA 300 |
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温度 | 最低: 80 K / 最高: 105 K / 平均: 93 K |
アライメント法 | Legacy - 非点収差: Objective lens astigmatism was corrected at 130,000 times magnification. |
日付 | 2013年10月1日 |
撮影 | カテゴリ: CCD フィルム・検出器のモデル: GATAN ULTRASCAN 4000 (4k x 4k) 実像数: 76 / 平均電子線量: 12 e/Å2 / ビット/ピクセル: 16 |
Tilt angle min | 0 |
電子線 | 加速電圧: 300 kV / 電子線源: ![]() |
電子光学系 | 倍率(補正後): 79730 / 照射モード: FLOOD BEAM / 撮影モード: BRIGHT FIELD / Cs: 1.2 mm / 最大 デフォーカス(公称値): 1.5 µm / 最小 デフォーカス(公称値): 0.02 µm / 倍率(公称値): 59000 |
試料ステージ | 試料ホルダー: Liquid nitrogen cooled. Standard Polara cartridge. 試料ホルダーモデル: OTHER / Tilt angle max: 60 / Tilt series - Axis1 - Min angle: 0 ° / Tilt series - Axis1 - Max angle: 60 ° |
実験機器 | ![]() モデル: Tecnai Polara / 画像提供: FEI Company |
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画像解析
詳細 | Images were unbent using 2dx. |
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最終 再構成 | 解像度のタイプ: BY AUTHOR / 解像度: 18.0 Å / 解像度の算出法: OTHER / ソフトウェア - 名称: 2dx / 詳細: Final maps were calculated with CCP4. |
結晶パラメータ | 単位格子 - A: 70 Å / 単位格子 - B: 123 Å / 単位格子 - C: 200 Å / 単位格子 - γ: 90 ° / 単位格子 - α: 90.0 ° / 単位格子 - β: 90.0 ° / 面群: P 1 21 |
CTF補正 | 詳細: Algorithm in 2dx. |