+
データを開く
-
基本情報
登録情報 | データベース: PDB / ID: 6jkc | |||||||||
---|---|---|---|---|---|---|---|---|---|---|
タイトル | Crystal structure of tetrameric PepTSo2 in P4212 space group | |||||||||
![]() | Proton:oligopeptide symporter POT family | |||||||||
![]() | MEMBRANE PROTEIN / Peptide transporter / LCP crystallization | |||||||||
機能・相同性 | ![]() dipeptide transmembrane transport / tripeptide transmembrane transporter activity / peptide:proton symporter activity / dipeptide transmembrane transporter activity / identical protein binding / plasma membrane 類似検索 - 分子機能 | |||||||||
生物種 | ![]() | |||||||||
手法 | ![]() ![]() ![]() | |||||||||
![]() | Nagamura, R. / Fukuda, M. / Ishitani, R. / Nureki, O. | |||||||||
資金援助 | ![]()
| |||||||||
![]() | ![]() タイトル: Structural basis for oligomerization of the prokaryotic peptide transporter PepT. 著者: Reina Nagamura / Masahiro Fukuda / Akihiro Kawamoto / Kyoko Matoba / Naoshi Dohmae / Ryuichiro Ishitani / Junichi Takagi / Osamu Nureki / ![]() 要旨: Proton-dependent oligopeptide transporters (POTs) belong to the major facilitator superfamily (MFS) and transport dipeptides and tripeptides from the extracellular environment into the target cell. ...Proton-dependent oligopeptide transporters (POTs) belong to the major facilitator superfamily (MFS) and transport dipeptides and tripeptides from the extracellular environment into the target cell. The human POTs PepT1 and PepT2 are also involved in the absorption of various orally ingested drugs. Previously reported structures revealed that the bacterial POTs possess 14 helices, of which H1-H6 and H7-H12 constitute the typical MFS fold and the residual two helices are involved in the cytoplasmic linker. PepT from Shewanella oneidensis is a unique POT which reportedly assembles as a 200 kDa tetramer. Although the previously reported structures suggested the importance of H12 for tetramer formation, the structural basis for the PepT-specific oligomerization remains unclear owing to the lack of a high-resolution tetrameric structure. In this study, the expression and purification conditions for tetrameric PepT were optimized. A single-particle cryo-EM analysis revealed the tetrameric structure of PepT incorporated into Salipro nanoparticles at 4.1 Å resolution. Furthermore, a combination of lipidic cubic phase (LCP) crystallization and an automated data-processing system for multiple microcrystals enabled crystal structures of PepT to be determined at resolutions of 3.5 and 3.9 Å. The present structures in a lipid bilayer revealed the detailed mechanism for the tetrameric assembly of PepT, in which a characteristic extracellular loop (ECL) interacts with two asparagine residues on H12 which were reported to be important for tetramerization and plays an essential role in oligomeric assembly. This study provides valuable insights into the oligomerization mechanism of this MFS-type transporter, which will further pave the way for understanding other oligomeric membrane proteins. | |||||||||
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 | ![]() | 120.5 KB | 表示 | ![]() |
---|---|---|---|---|
PDB形式 | ![]() | 75.5 KB | 表示 | ![]() |
PDBx/mmJSON形式 | ![]() | ツリー表示 | ![]() | |
その他 | ![]() |
-検証レポート
アーカイブディレクトリ | ![]() ![]() | HTTPS FTP |
---|
-関連構造データ
-
リンク
-
集合体
登録構造単位 | ![]()
| ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1 | ![]()
| ||||||||||||
単位格子 |
|
-
要素
#1: タンパク質 | 分子量: 57626.559 Da / 分子数: 1 / 由来タイプ: 組換発現 / 詳細: UniProt ID: Q8EHE6 由来: (組換発現) ![]() 株: MR-1 / 遺伝子: SO_1277 / 発現宿主: ![]() ![]() |
---|
-実験情報
-実験
実験 | 手法: ![]() |
---|
-
試料調製
結晶 | マシュー密度: 3.23 Å3/Da / 溶媒含有率: 66.64 % |
---|---|
結晶化 | 温度: 293 K / 手法: 脂質キュービック相法 / pH: 4 / 詳細: 40% PEG 200, 100 mM NaCl, 100 mM Na acetate, pH 4.0 |
-データ収集
回折 | 平均測定温度: 100 K / Serial crystal experiment: N |
---|---|
放射光源 | 由来: ![]() ![]() ![]() |
検出器 | タイプ: DECTRIS EIGER X 9M / 検出器: PIXEL / 日付: 2017年12月20日 |
放射 | プロトコル: SINGLE WAVELENGTH / 単色(M)・ラウエ(L): M / 散乱光タイプ: x-ray |
放射波長 | 波長: 1 Å / 相対比: 1 |
反射 | 解像度: 3.5→47.53 Å / Num. obs: 8312 / % possible obs: 83 % / 冗長度: 3.6 % / Biso Wilson estimate: 79.72 Å2 / CC1/2: 0.961 / Rmerge(I) obs: 0.284 / Rrim(I) all: 0.328 / Net I/σ(I): 5.49 |
反射 シェル | 解像度: 3.5→3.71 Å / 冗長度: 3.5 % / Rmerge(I) obs: 1.359 / Num. unique obs: 1295 / CC1/2: 0.293 / Rrim(I) all: 1.586 / % possible all: 83.4 |
-
解析
ソフトウェア |
| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
精密化 | 構造決定の手法: ![]() 開始モデル: 4LEP 解像度: 3.5→47.53 Å / SU ML: 0.4697 / 交差検証法: FREE R-VALUE / σ(F): 1.33 / 位相誤差: 30.8325
| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
溶媒の処理 | 減衰半径: 0.9 Å / VDWプローブ半径: 1.11 Å | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
原子変位パラメータ | Biso mean: 65.71 Å2 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
精密化ステップ | サイクル: LAST / 解像度: 3.5→47.53 Å
| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
拘束条件 |
| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
LS精密化 シェル |
|