+
データを開く
-
基本情報
登録情報 | データベース: PDB / ID: 9kca | |||||||||
---|---|---|---|---|---|---|---|---|---|---|
タイトル | Cryo-EM structure of docked mouse bestrophin-1 in a closed state | |||||||||
![]() | Bestrophin-1,Soluble cytochrome b562 | |||||||||
![]() | MEMBRANE PROTEIN / Docked / closed / Calcium-bound | |||||||||
機能・相同性 | ![]() membrane microdomain / bicarbonate channel activity / gamma-aminobutyric acid secretion, neurotransmission / transepithelial chloride transport / ligand-gated channel activity / intracellularly calcium-gated chloride channel activity / detection of light stimulus involved in visual perception / Stimuli-sensing channels / glutamate secretion / chloride transport ...membrane microdomain / bicarbonate channel activity / gamma-aminobutyric acid secretion, neurotransmission / transepithelial chloride transport / ligand-gated channel activity / intracellularly calcium-gated chloride channel activity / detection of light stimulus involved in visual perception / Stimuli-sensing channels / glutamate secretion / chloride transport / chloride channel activity / protein complex oligomerization / regulation of calcium ion transport / chloride channel complex / electron transport chain / regulation of synaptic plasticity / presynapse / basolateral plasma membrane / periplasmic space / electron transfer activity / iron ion binding / heme binding / metal ion binding / identical protein binding / plasma membrane 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: 3.18 Å | |||||||||
![]() | Lim, H.H. / Kim, K.W. / Ko, A. | |||||||||
資金援助 | ![]()
| |||||||||
![]() | ![]() タイトル: Cryo-EM structures of mouse bestrophin 1 channel in closed and partially open conformations. 著者: Kwon-Woo Kim / Euna Lee / Ara Ko / Junmo Hwang / Kunwoong Park / Byoung-Cheol Lee / Ki Woo Kim / Won-Jong Oh / Kyuhyung Kim / Hyun-Ho Lim / ![]() 要旨: Bestrophin 1 (BEST1) channels are calcium-activated Cl channels involved in diverse physiological processes, including gliotransmitter release in astrocytes. Although human and chicken BEST1 ...Bestrophin 1 (BEST1) channels are calcium-activated Cl channels involved in diverse physiological processes, including gliotransmitter release in astrocytes. Although human and chicken BEST1 orthologs have been extensively studied, the structural and functional properties of mouse BEST1 (mBEST1) remain poorly understood. In this study, we characterized the structure-function of mBEST1-BF, a C-terminally tagged variant, using whole-cell patch-clamp recordings, surface biotinylation assays, and single-particle cryo-electron microscopy. Cryo-electron microscopy structural analysis of mBEST1-BF revealed closed and partially open conformations. Comparative analysis with human and chicken BEST1 orthologs highlighted conserved calcium-binding and gating mechanisms, with distinct features in mBEST1, including a wider aperture sufficient to accommodate dehydrated Cl ions and potential anion-binding sites near Val205 and Gln208 residues. The disordered C-terminal region of mBEST1 remains unresolved, suggesting it may require stabilizing factors for structural determination. Additionally, the autoinhibitory domain, which includes Ser354, likely plays a key role in regulating gating, with Ser354 potentially serving as a phosphorylation site that modulates channel activity. Our findings provide structural and functional insights into mBEST1 and suggest mechanisms underlying its unique gating and ion permeation properties. | |||||||||
履歴 |
|
-
構造の表示
構造ビューア | 分子: ![]() ![]() |
---|
-
ダウンロードとリンク
-
ダウンロード
PDBx/mmCIF形式 | ![]() | 388 KB | 表示 | ![]() |
---|---|---|---|---|
PDB形式 | ![]() | 309.3 KB | 表示 | ![]() |
PDBx/mmJSON形式 | ![]() | ツリー表示 | ![]() | |
その他 | ![]() |
-検証レポート
文書・要旨 | ![]() | 1.2 MB | 表示 | ![]() |
---|---|---|---|---|
文書・詳細版 | ![]() | 1.2 MB | 表示 | |
XML形式データ | ![]() | 59.9 KB | 表示 | |
CIF形式データ | ![]() | 88.2 KB | 表示 | |
アーカイブディレクトリ | ![]() ![]() | HTTPS FTP |
-関連構造データ
関連構造データ | ![]() 62247MC ![]() 9kc9C ![]() 9kp6C M: このデータのモデリングに利用したマップデータ C: 同じ文献を引用 ( |
---|---|
類似構造データ | 類似検索 - 機能・相同性 ![]() |
-
リンク
-
集合体
登録構造単位 | ![]()
|
---|---|
1 |
|
-
要素
#1: タンパク質 | 分子量: 79285.266 Da / 分子数: 5 / 断片: BRIL-3X / 変異: M29W,H124I,R128L / 由来タイプ: 組換発現 由来: (組換発現) ![]() ![]() ![]() ![]() 遺伝子: Best1, Bmd1, Vmd2, cybC / 細胞株 (発現宿主): HEK293 / 発現宿主: ![]() #2: 化合物 | ChemComp-CA / #3: 化合物 | ChemComp-CL / 研究の焦点であるリガンドがあるか | Y | Has protein modification | N | |
---|
-実験情報
-実験
実験 | 手法: 電子顕微鏡法 |
---|---|
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: Docked Pentameric structure of mouse bestrophin-1 in a closed state タイプ: COMPLEX / Entity ID: #1 / 由来: RECOMBINANT | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
由来(天然) |
| ||||||||||||
由来(組換発現) | 生物種: ![]() | ||||||||||||
緩衝液 | pH: 8 | ||||||||||||
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 |
-
電子顕微鏡撮影
顕微鏡 | モデル: TFS GLACIOS |
---|---|
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): 2750 nm / 最小 デフォーカス(公称値): 1000 nm |
撮影 | 電子線照射量: 40 e/Å2 フィルム・検出器のモデル: FEI FALCON IV (4k x 4k) |
-
解析
EMソフトウェア | 名称: PHENIX / バージョン: 1.21rc1_5156: / カテゴリ: モデル精密化 |
---|---|
CTF補正 | タイプ: NONE |
3次元再構成 | 解像度: 3.18 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 39144 / 対称性のタイプ: POINT |