+データを開く
-基本情報
登録情報 | データベース: PDB / ID: 7ccs | ||||||
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タイトル | Consensus mutated xCT-CD98hc complex | ||||||
要素 |
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キーワード | TRANSPORT PROTEIN / Transporter / membrane protein / complex | ||||||
機能・相同性 | 機能・相同性情報 cystine:glutamate antiporter activity / regulation of neutrophil apoptotic process / L-kynurenine transmembrane transport / L-kynurenine transmembrane transporter activity / regulation of cysteine metabolic process / regulation of glutathione biosynthetic process / regulation of glutamate metabolic process / regulation of melanin biosynthetic process / regulation of AMPA glutamate receptor clustering / L-cystine transport ...cystine:glutamate antiporter activity / regulation of neutrophil apoptotic process / L-kynurenine transmembrane transport / L-kynurenine transmembrane transporter activity / regulation of cysteine metabolic process / regulation of glutathione biosynthetic process / regulation of glutamate metabolic process / regulation of melanin biosynthetic process / regulation of AMPA glutamate receptor clustering / L-cystine transport / Defective SLC7A7 causes lysinuric protein intolerance (LPI) / neutral L-amino acid secondary active transmembrane transporter activity / apical pole of neuron / aromatic amino acid transmembrane transporter activity / tyrosine transport / L-histidine transport / amino acid transport complex / dipeptide import across plasma membrane / L-leucine import across plasma membrane / L-alanine transmembrane transporter activity / L-alanine import across plasma membrane / regulation of protein transport / isoleucine transport / phenylalanine transport / methionine transport / L-amino acid transmembrane transporter activity / valine transport / L-leucine transmembrane transporter activity / calcium:sodium antiporter activity / L-leucine transport / thyroid hormone transport / proline transport / L-glutamate transmembrane transport / glutathione transmembrane transport / amino acid transmembrane transport / regulation of cellular response to oxidative stress / ventricular system development / lens fiber cell differentiation / intracellular glutamate homeostasis / Amino acid transport across the plasma membrane / neutral L-amino acid transmembrane transporter activity / L-glutamate import across plasma membrane / Tryptophan catabolism / striatum development / astrocyte projection / exogenous protein binding / anchoring junction / limb development / Basigin interactions / negative regulation of ferroptosis / response to redox state / microvillus membrane / NFE2L2 regulating anti-oxidant/detoxification enzymes / lung alveolus development / amino acid transport / regulation of synapse organization / adult behavior / response to exogenous dsRNA / tryptophan transport / glutathione metabolic process / basal plasma membrane / response to nicotine / brush border membrane / modulation of chemical synaptic transmission / visual learning / response to organic cyclic compound / platelet aggregation / response to toxic substance / calcium ion transport / double-stranded RNA binding / melanosome / apical part of cell / virus receptor activity / regulation of cell population proliferation / cellular response to oxidative stress / basolateral plasma membrane / carbohydrate metabolic process / cadherin binding / symbiont entry into host cell / protein heterodimerization activity / apical plasma membrane / lysosomal membrane / synapse / cell surface / protein homodimerization activity / RNA binding / extracellular exosome / nucleoplasm / membrane / plasma membrane 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: 6.2 Å | ||||||
データ登録者 | Oda, K. / Lee, Y. / Takemoto, M. / Yamashita, K. / Nishizawa, T. / Nureki, O. | ||||||
引用 | ジャーナル: Protein Sci / 年: 2020 タイトル: Consensus mutagenesis approach improves the thermal stability of system x transporter, xCT, and enables cryo-EM analyses. 著者: Kazumasa Oda / Yongchan Lee / Pattama Wiriyasermkul / Yoko Tanaka / Mizuki Takemoto / Keitaro Yamashita / Shushi Nagamori / Tomohiro Nishizawa / Osamu Nureki / 要旨: System x is an amino acid antiporter that imports L-cystine into cells and exports intracellular L-glutamate, at a 1:1 ratio. As L-cystine is an essential precursor for glutathione synthesis, system ...System x is an amino acid antiporter that imports L-cystine into cells and exports intracellular L-glutamate, at a 1:1 ratio. As L-cystine is an essential precursor for glutathione synthesis, system x supports tumor cell growth through glutathione-based oxidative stress resistance and is considered as a potential therapeutic target for cancer treatment. System x consists of two subunits, the light chain subunit SLC7A11 (xCT) and the heavy chain subunit SLC3A2 (also known as CD98hc or 4F2hc), which are linked by a conserved disulfide bridge. Although the recent structures of another SLC7 member, L-type amino acid transporter 1 (LAT1) in complex with CD98hc, have provided the structural basis toward understanding the amino acid transport mechanism, the detailed molecular mechanism of xCT remains unknown. To revealthe molecular mechanism, we performed single-particle analyses of the xCT-CD98hc complex. As wild-type xCT-CD98hc displayed poor stability and could not be purified to homogeneity, we applied a consensus mutagenesis approach to xCT. The consensus mutated construct exhibited increased stability as compared to the wild-type, and enabled the cryoelectron microscopy (cryo-EM) map to be obtained at 6.2 Å resolution by single-particle analysis. The cryo-EM map revealed sufficient electron density to assign secondary structures. In the xCT structure, the hash and arm domains are well resolved, whereas the bundle domain shows some flexibility. CD98hc is positioned next to the xCT transmembrane domain. This study provides the structural basis of xCT, and our consensus-based strategy could represent a good choice toward solving unstable protein structures. | ||||||
履歴 |
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-構造の表示
ムービー |
ムービービューア |
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構造ビューア | 分子: MolmilJmol/JSmol |
-ダウンロードとリンク
-ダウンロード
PDBx/mmCIF形式 | 7ccs.cif.gz | 172.4 KB | 表示 | PDBx/mmCIF形式 |
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PDB形式 | pdb7ccs.ent.gz | 139.9 KB | 表示 | PDB形式 |
PDBx/mmJSON形式 | 7ccs.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
文書・要旨 | 7ccs_validation.pdf.gz | 927.3 KB | 表示 | wwPDB検証レポート |
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文書・詳細版 | 7ccs_full_validation.pdf.gz | 938.1 KB | 表示 | |
XML形式データ | 7ccs_validation.xml.gz | 36.8 KB | 表示 | |
CIF形式データ | 7ccs_validation.cif.gz | 56.1 KB | 表示 | |
アーカイブディレクトリ | https://data.pdbj.org/pub/pdb/validation_reports/cc/7ccs ftp://data.pdbj.org/pub/pdb/validation_reports/cc/7ccs | HTTPS FTP |
-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: 68069.625 Da / 分子数: 1 / 由来タイプ: 組換発現 / 由来: (組換発現) Homo sapiens (ヒト) / 遺伝子: SLC3A2, MDU1 / 細胞株 (発現宿主): HEK293SGnTI- / 発現宿主: Homo sapiens (ヒト) / 参照: UniProt: P08195 |
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#2: タンパク質 | 分子量: 55933.852 Da / 分子数: 1 / 由来タイプ: 組換発現 / 由来: (組換発現) Homo sapiens (ヒト) / 遺伝子: SLC7A11 / 細胞株 (発現宿主): HEK293SGnTI- / 発現宿主: Homo sapiens (ヒト) / 参照: UniProt: Q9UPY5*PLUS |
-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: Consensus mutated xCT-CD98hc complex / タイプ: COMPLEX / Entity ID: all / 由来: RECOMBINANT |
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分子量 | 値: 0.12 MDa / 実験値: YES |
由来(天然) | 生物種: Homo sapiens (ヒト) |
由来(組換発現) | 生物種: Homo sapiens (ヒト) |
緩衝液 | pH: 8 |
試料 | 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: COPPER/RHODIUM / グリッドのサイズ: 300 divisions/in. / グリッドのタイプ: Quantifoil R1.2/1.3 |
急速凍結 | 凍結剤: ETHANE |
-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: FIELD EMISSION GUN / 加速電圧: 300 kV / 照射モード: FLOOD BEAM |
電子レンズ | モード: BRIGHT FIELD |
撮影 | 電子線照射量: 49.76 e/Å2 / フィルム・検出器のモデル: GATAN K3 (6k x 4k) |
-解析
CTF補正 | タイプ: PHASE FLIPPING AND AMPLITUDE CORRECTION |
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3次元再構成 | 解像度: 6.2 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 86395 詳細: This pdb entry contains an issue about peptide linkage (bond outlier). Residues GLU A 213 and LEU A 214 that are next to each other are not properly linked: distance between C and N is 3.35. ...詳細: This pdb entry contains an issue about peptide linkage (bond outlier). Residues GLU A 213 and LEU A 214 that are next to each other are not properly linked: distance between C and N is 3.35. This was introduced upon the fitting of the homology model into the low resolution cryo-EM map by using Rosetta. The model has not undergone any further structure refinement. 対称性のタイプ: POINT |