+データを開く
-基本情報
登録情報 | データベース: PDB / ID: 8k7b | ||||||||||||
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タイトル | post-occluded structure of human ABCB6 W546A mutant (ADP/VO4-bound) | ||||||||||||
要素 | ATP-binding cassette sub-family B member 6 | ||||||||||||
キーワード | TRANSPORT PROTEIN / ATP-Binding Cassette transporter mitochondrial transporter / post-occluded / ADP/VO4-bound / ABCB6 / MEMBRANE PROTEIN | ||||||||||||
機能・相同性 | 機能・相同性情報 cellular detoxification of cadmium ion / Defective ABCB6 causes MCOPCB7 / Mitochondrial ABC transporters / tetrapyrrole metabolic process / heme transmembrane transport / ABC-type heme transporter / ABC-type heme transporter activity / porphyrin-containing compound metabolic process / heme transport / tetrapyrrole binding ...cellular detoxification of cadmium ion / Defective ABCB6 causes MCOPCB7 / Mitochondrial ABC transporters / tetrapyrrole metabolic process / heme transmembrane transport / ABC-type heme transporter / ABC-type heme transporter activity / porphyrin-containing compound metabolic process / heme transport / tetrapyrrole binding / heme metabolic process / porphyrin-containing compound biosynthetic process / melanosome assembly / melanosome membrane / multivesicular body membrane / mitochondrial envelope / endolysosome membrane / vacuolar membrane / skin development / efflux transmembrane transporter activity / intracellular copper ion homeostasis / ABC-type transporter activity / ATP-binding cassette (ABC) transporter complex / brain development / transmembrane transport / early endosome membrane / intracellular iron ion homeostasis / mitochondrial outer membrane / endosome / Golgi membrane / lysosomal membrane / heme binding / endoplasmic reticulum membrane / Golgi apparatus / endoplasmic reticulum / ATP hydrolysis activity / mitochondrion / extracellular exosome / nucleoplasm / ATP binding / plasma membrane / cytosol 類似検索 - 分子機能 | ||||||||||||
生物種 | Homo sapiens (ヒト) | ||||||||||||
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: 3.9 Å | ||||||||||||
データ登録者 | Jin, M.S. / Lee, S.S. / Park, J.G. / Jang, E. / Choi, S.H. / Kim, S. / Kim, J.W. | ||||||||||||
資金援助 | 韓国, 3件
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引用 | ジャーナル: Commun Biol / 年: 2023 タイトル: W546 stacking disruption traps the human porphyrin transporter ABCB6 in an outward-facing transient state. 著者: Sang Soo Lee / Jun Gyou Park / Eunhong Jang / Seung Hun Choi / Subin Kim / Ji Won Kim / Mi Sun Jin / 要旨: Human ATP-binding cassette transporter subfamily B6 (ABCB6) is a mitochondrial ATP-driven pump that translocates porphyrins from the cytoplasm into mitochondria for heme biosynthesis. Within the ...Human ATP-binding cassette transporter subfamily B6 (ABCB6) is a mitochondrial ATP-driven pump that translocates porphyrins from the cytoplasm into mitochondria for heme biosynthesis. Within the transport pathway, a conserved aromatic residue W546 located in each monomer plays a pivotal role in stabilizing the occluded conformation via π-stacking interactions. Herein, we employed cryo-electron microscopy to investigate the structural consequences of a single W546A mutation in ABCB6, both in detergent micelles and nanodiscs. The results demonstrate that the W546A mutation alters the conformational dynamics of detergent-purified ABCB6, leading to entrapment of the transporter in an outward-facing transient state. However, in the nanodisc system, we observed a direct interaction between the transporter and a phospholipid molecule that compensates for the absence of the W546 residue, thereby facilitating the normal conformational transition of the transporter toward the occluded state following ATP hydrolysis. The findings also reveal that adoption of the outward-facing conformation causes charge repulsion between ABCB6 and the bound substrate, and rearrangement of key interacting residues at the substrate-binding site. Consequently, the affinity for the substrate is significantly reduced, facilitating its release from the transporter. | ||||||||||||
履歴 |
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-構造の表示
構造ビューア | 分子: MolmilJmol/JSmol |
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-ダウンロードとリンク
-ダウンロード
PDBx/mmCIF形式 | 8k7b.cif.gz | 219.8 KB | 表示 | PDBx/mmCIF形式 |
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PDB形式 | pdb8k7b.ent.gz | 174.4 KB | 表示 | PDB形式 |
PDBx/mmJSON形式 | 8k7b.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
アーカイブディレクトリ | https://data.pdbj.org/pub/pdb/validation_reports/k7/8k7b ftp://data.pdbj.org/pub/pdb/validation_reports/k7/8k7b | HTTPS FTP |
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-関連構造データ
-リンク
-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: 66214.156 Da / 分子数: 2 / 変異: W546A / 由来タイプ: 組換発現 / 由来: (組換発現) Homo sapiens (ヒト) / 遺伝子: ABCB6, MTABC3, PRP, UMAT / 発現宿主: Trichoplusia ni (イラクサキンウワバ) / 参照: UniProt: Q9NP58, ABC-type heme transporter #2: 化合物 | #3: 化合物 | #4: 化合物 | 研究の焦点であるリガンドがあるか | Y | |
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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 |
-試料調製
構成要素 | 名称: ATP-binding cassette sub-family B member 6 - Homo sapiens タイプ: ORGANELLE OR CELLULAR COMPONENT / Entity ID: #1 / 由来: RECOMBINANT |
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分子量 | 実験値: NO |
由来(天然) | 生物種: Homo sapiens (ヒト) |
由来(組換発現) | 生物種: Trichoplusia ni (イラクサキンウワバ) |
緩衝液 | pH: 7 |
試料 | 濃度: 0.5 mg/ml / 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES |
急速凍結 | 凍結剤: ETHANE / 湿度: 100 % / 凍結前の試料温度: 277 K |
-電子顕微鏡撮影
実験機器 | モデル: Talos Arctica / 画像提供: FEI Company |
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顕微鏡 | モデル: FEI TALOS ARCTICA |
電子銃 | 電子線源: FIELD EMISSION GUN / 加速電圧: 200 kV / 照射モード: SPOT SCAN |
電子レンズ | モード: BRIGHT FIELD / 最大 デフォーカス(公称値): 2400 nm / 最小 デフォーカス(公称値): 700 nm |
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) |
-解析
CTF補正 | タイプ: NONE |
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3次元再構成 | 解像度: 3.9 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 323588 / 対称性のタイプ: POINT |