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基本情報
登録情報 | データベース: PDB / ID: 8q8q | ||||||
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タイトル | Cryo-EM structure of the magnesium channel CtMrs2 in the open state | ||||||
![]() | Magnesium channel Mrs2 | ||||||
![]() | MEMBRANE PROTEIN / Magnesium channel Mrs2 | ||||||
機能・相同性 | Chem-LOP![]() | ||||||
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: 3.22 Å | ||||||
![]() | Gourdon, P. / Li, P. | ||||||
資金援助 | ![]()
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![]() | ![]() タイトル: Closed and open structures of the eukaryotic magnesium channel Mrs2 reveal the auto-ligand-gating regulation mechanism. 著者: Ping Li / Shiyan Liu / Johan Wallerstein / Rhiza Lyne E Villones / Peng Huang / Karin Lindkvist-Petersson / Gabriele Meloni / Kefeng Lu / Kristine Steen Jensen / Sara I Liin / Pontus Gourdon / ![]() ![]() ![]() ![]() 要旨: The CorA/Mrs2 family of pentameric proteins are cardinal for the influx of Mg across cellular membranes, importing the cation to mitochondria in eukaryotes. Yet, the conducting and regulation ...The CorA/Mrs2 family of pentameric proteins are cardinal for the influx of Mg across cellular membranes, importing the cation to mitochondria in eukaryotes. Yet, the conducting and regulation mechanisms of permeation remain elusive, particularly for the eukaryotic Mrs2 members. Here, we report closed and open Mrs2 cryo-electron microscopy structures, accompanied by functional characterization. Mg flux is permitted by a narrow pore, gated by methionine and arginine residues in the closed state. Transition between the conformations is orchestrated by two pairs of conserved sensor-serving Mg-binding sites in the mitochondrial matrix lumen, located in between monomers. At lower levels of Mg, these ions are stripped, permitting an alternative, symmetrical shape, maintained by the RDLR motif that replaces one of the sensor site pairs in the open conformation. Thus, our findings collectively establish the molecular basis for selective Mg influx of Mrs2 and an auto-ligand-gating regulation mechanism. #1: ジャーナル: Acta Crystallogr D Struct Biol / 年: 2018 タイトル: Real-space refinement in PHENIX for cryo-EM and crystallography. 著者: Pavel V Afonine / Billy K Poon / Randy J Read / Oleg V Sobolev / Thomas C Terwilliger / Alexandre Urzhumtsev / Paul D Adams / ![]() ![]() ![]() 要旨: This article describes the implementation of real-space refinement in the phenix.real_space_refine program from the PHENIX suite. The use of a simplified refinement target function enables very fast ...This article describes the implementation of real-space refinement in the phenix.real_space_refine program from the PHENIX suite. The use of a simplified refinement target function enables very fast calculation, which in turn makes it possible to identify optimal data-restraint weights as part of routine refinements with little runtime cost. Refinement of atomic models against low-resolution data benefits from the inclusion of as much additional information as is available. In addition to standard restraints on covalent geometry, phenix.real_space_refine makes use of extra information such as secondary-structure and rotamer-specific restraints, as well as restraints or constraints on internal molecular symmetry. The re-refinement of 385 cryo-EM-derived models available in the Protein Data Bank at resolutions of 6 Å or better shows significant improvement of the models and of the fit of these models to the target maps. | ||||||
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構造の表示
構造ビューア | 分子: ![]() ![]() |
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-検証レポート
アーカイブディレクトリ | ![]() ![]() | HTTPS FTP |
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-関連構造データ
関連構造データ | ![]() 18257MC ![]() 8q8pC C: 同じ文献を引用 ( M: このデータのモデリングに利用したマップデータ |
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類似構造データ | 類似検索 - 機能・相同性 ![]() |
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集合体
登録構造単位 | ![]()
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非結晶学的対称性 (NCS) | NCSドメイン:
NCSドメイン領域: Ens-ID: ens_1
NCS oper:
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要素
#1: タンパク質 | 分子量: 49090.285 Da / 分子数: 5 / 由来タイプ: 組換発現 由来: (組換発現) ![]() 発現宿主: ![]() ![]() #2: 化合物 | ChemComp-LOP / ( #3: 化合物 | 研究の焦点であるリガンドがあるか | Y | Has protein modification | N | |
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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: Mrs2 homo-pentamer / タイプ: COMPLEX / Entity ID: #1 / 由来: RECOMBINANT |
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由来(天然) | 生物種: ![]() |
由来(組換発現) | 生物種: ![]() ![]() |
緩衝液 | pH: 7.5 |
試料 | 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 |
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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 / 最大 デフォーカス(公称値): 2000 nm / 最小 デフォーカス(公称値): 600 nm |
撮影 | 電子線照射量: 49.958 e/Å2 / フィルム・検出器のモデル: GATAN K3 (6k x 4k) |
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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: 3.22 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 116609 / 対称性のタイプ: POINT | ||||||||||||||||||||||||||||||
精密化 | 交差検証法: NONE 立体化学のターゲット値: GeoStd + Monomer Library + CDL v1.2 | ||||||||||||||||||||||||||||||
原子変位パラメータ | Biso mean: 57.3 Å2 | ||||||||||||||||||||||||||||||
拘束条件 |
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Refine LS restraints NCS |
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