- PDB-2zz9: Structure of aquaporin-4 S180D mutant at 2.8 A resolution by elec... -
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基本情報
登録情報
データベース: PDB / ID: 2zz9
タイトル
Structure of aquaporin-4 S180D mutant at 2.8 A resolution by electron crystallography
要素
Aquaporin-4
キーワード
TRANSPORT PROTEIN / WATER TRANSPORT / WATER CHANNEL / AQUAPORIN / TWO-DIMENSIONAL CRYSTAL / MEMBRANE PROTEIN / BACULOVIRUS EXPRESSION SYSTEM / Glycoprotein / Membrane / Phosphoprotein / Transmembrane / Transport
機能・相同性
機能・相同性情報
Passive transport by Aquaporins / cerebrospinal fluid secretion / renal water absorption / regulation of vascular endothelial growth factor production / cerebrospinal fluid circulation / astrocyte end-foot / intracellular water homeostasis / water transport / water channel activity / negative regulation of cell adhesion molecule production ...Passive transport by Aquaporins / cerebrospinal fluid secretion / renal water absorption / regulation of vascular endothelial growth factor production / cerebrospinal fluid circulation / astrocyte end-foot / intracellular water homeostasis / water transport / water channel activity / negative regulation of cell adhesion molecule production / cell projection membrane / multicellular organismal-level water homeostasis / Vasopressin regulates renal water homeostasis via Aquaporins / cellular response to interleukin-6 / negative regulation of interleukin-1 beta production / negative regulation of interleukin-6 production / cellular response to interleukin-1 / response to glucocorticoid / T-tubule / basal plasma membrane / cellular response to estradiol stimulus / establishment of localization in cell / female pregnancy / cellular response to glucose stimulus / sensory perception of sound / carbon dioxide transport / sarcolemma / cellular response to type II interferon / cell-cell adhesion / cell-cell junction / basolateral plasma membrane / protein homotetramerization / endosome membrane / external side of plasma membrane / protein-containing complex / extracellular region / identical protein binding / plasma membrane / cytoplasm 類似検索 - 分子機能
Glycerol uptake facilitator protein / Glycerol uptake facilitator protein. / Aquaporin transporter / Major intrinsic protein, conserved site / MIP family signature. / Major intrinsic protein / Major intrinsic protein / Aquaporin-like / Up-down Bundle / Mainly Alpha 類似検索 - ドメイン・相同性
ジャーナル: J Mol Biol / 年: 2009 タイトル: Mechanism of aquaporin-4's fast and highly selective water conduction and proton exclusion. 著者: Kazutoshi Tani / Tadanori Mitsuma / Yoko Hiroaki / Akiko Kamegawa / Kouki Nishikawa / Yukihiro Tanimura / Yoshinori Fujiyoshi / 要旨: Members of the aquaporin (AQP) family are expressed in almost every organism, including 13 homologues in humans. Based on the electron crystallographic structure of AQP1, the hydrogen-bond isolation ...Members of the aquaporin (AQP) family are expressed in almost every organism, including 13 homologues in humans. Based on the electron crystallographic structure of AQP1, the hydrogen-bond isolation mechanism was proposed to explain why AQPs are impermeable to protons despite their very fast water conduction. The mechanism by which AQPs exclude protons remained controversial, however. Here we present the structure of AQP4 at 2.8 A resolution obtained by electron crystallography of double-layered two-dimensional crystals. The resolution has been improved from the previous 3.2 A, with accompanying improvement in data quality resulting in the ability to identify individual water molecules. Our structure of AQP4, the predominant water channel in the brain, reveals eight water molecules in the channel. The arrangement of the waters provides support for the hydrogen-bond isolation mechanism. Our AQP4 structure also visualizes five lipids, showing that direct interactions of the extracellular surface of AQP4 with three lipids in the adjoining membrane help stabilize the membrane junction.
解像度: 2.8→10 Å / Cor.coef. Fo:Fc: 0.926 / Cor.coef. Fo:Fc free: 0.839 / SU B: 41.271 / SU ML: 0.355 / 交差検証法: THROUGHOUT / σ(F): 0 / σ(I): 0 / ESU R Free: 0.395 / 立体化学のターゲット値: MAXIMUM LIKELIHOOD / 詳細: HYDROGENS HAVE BEEN ADDED IN THE RIDING POSITIONS
Rfactor
反射数
%反射
Selection details
Rfree
0.28788
481
4.9 %
RANDOM
Rwork
0.23079
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all
0.234
9879
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obs
0.234
8089
81.88 %
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溶媒の処理
イオンプローブ半径: 0.8 Å / 減衰半径: 0.8 Å / VDWプローブ半径: 1.2 Å / 溶媒モデル: MASK