- EMDB-5202: Influence of the cytoplasmic domains of aquaporin-4 on water cond... -
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基本情報
登録情報
データベース: EMDB / ID: EMD-5202
タイトル
Influence of the cytoplasmic domains of aquaporin-4 on water conduction and array formation.
マップデータ
This is an image of a surface rendered of Aquaporin-4
試料
試料: rat aquaporin-4 S180D mutant
タンパク質・ペプチド: aquaporin-4
キーワード
Water channel / Aquaporin / Cell adhesion
機能・相同性
機能・相同性情報
cerebrospinal fluid secretion / Passive transport by Aquaporins / regulation of vascular endothelial growth factor production / renal water absorption / cerebrospinal fluid circulation / astrocyte end-foot / intracellular water homeostasis / water transport / negative regulation of cell adhesion molecule production / water channel activity ...cerebrospinal fluid secretion / Passive transport by Aquaporins / regulation of vascular endothelial growth factor production / renal water absorption / cerebrospinal fluid circulation / astrocyte end-foot / intracellular water homeostasis / water transport / negative regulation of cell adhesion molecule production / water channel activity / cell projection membrane / multicellular organismal-level water homeostasis / cellular response to interleukin-6 / Vasopressin regulates renal water homeostasis via Aquaporins / 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 / female pregnancy / establishment of localization in cell / sensory perception of sound / cellular response to estradiol stimulus / carbon dioxide transport / cellular response to glucose stimulus / sarcolemma / cell-cell adhesion / cellular response to type II interferon / 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
: / Aquaporin transporter / Major intrinsic protein, conserved site / MIP family signature. / Major intrinsic protein / Major intrinsic protein / Aquaporin-like 類似検索 - ドメイン・相同性
ジャーナル: J Mol Biol / 年: 2010 タイトル: Influence of the cytoplasmic domains of aquaporin-4 on water conduction and array formation. 著者: Tadanori Mitsuma / Kazutoshi Tani / Yoko Hiroaki / Akiko Kamegawa / Hiroshi Suzuki / Hiroshi Hibino / Yoshihisa Kurachi / Yoshinori Fujiyoshi / 要旨: Phosphorylation of Ser180 in cytoplasmic loop D has been shown to reduce the water permeability of aquaporin (AQP) 4, the predominant water channel in the brain. However, when the structure of the ...Phosphorylation of Ser180 in cytoplasmic loop D has been shown to reduce the water permeability of aquaporin (AQP) 4, the predominant water channel in the brain. However, when the structure of the S180D mutant (AQP4M23S180D), which was generated to mimic phosphorylated Ser180, was determined to 2.8 Å resolution using electron diffraction patterns, it showed no significant differences from the structure of the wild-type channel. High-resolution density maps usually do not resolve protein regions that are only partially ordered, but these can sometimes be seen in lower-resolution density maps calculated from electron micrographs. We therefore used images of two-dimensional crystals and determined the structure of AQP4M23S180D at 10 A resolution. The features of the 10-A density map are consistent with those of the previously determined atomic model; in particular, there were no indications of any obstruction near the cytoplasmic pore entrance. In addition, water conductance measurements, both in vitro and in vivo, show the same water permeability for wild-type and mutant AQP4M23, suggesting that the S180D mutation neither reduces water conduction through a conformational change nor reduces water conduction by interacting with a protein that would obstruct the cytoplasmic channel entrance. Finally, the 10-A map shows a cytoplasmic density in between four adjacent tetramers that most likely represents the association of four N termini. This finding supports the critical role of the N terminus of AQP4 in the stabilization of orthogonal arrays, as well as their interference through lipid modification of cysteine residues in the longer N-terminal isoform.
詳細: molybdenum grid covered with a thin carbon film
凍結
凍結剤: NITROGEN / チャンバー内温度: 4.2 K / 装置: REICHERT-JUNG PLUNGER / 詳細: Vitrification instrument: Reichert plunger 手法: The grid was blotted with filter paper and plunged into liquid nitrogen.
詳細
dialysis
結晶化
詳細: dialysis
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電子顕微鏡法
顕微鏡
JEOL KYOTO-3000SFF
温度
平均: 4.2 K
アライメント法
Legacy - 非点収差: bjective lens astigmatism was corrected at 400,000 times magnification
撮影
カテゴリ: FILM フィルム・検出器のモデル: TVIPS TEMCAM-F415 (4k x 4k) デジタル化 - スキャナー: OTHER / デジタル化 - サンプリング間隔: 15 µm / 実像数: 246 / 平均電子線量: 38 e/Å2 / ビット/ピクセル: 16