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Calmodulin-dependent Signaling01:16

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Calmodulin (CaM) is a calcium-binding protein in eukaryotes that controls various calcium-regulated cellular processes. It has four calcium-binding sites that bind calcium to form the calcium-calmodulin ( Ca2+-CaM) complex. GPCR stimulation increases the calcium levels in the cells that bind to CaM and induces a conformational change.
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Calcium is an essential signaling molecule required for various cellular functions. Calcium pumps and ion channels on cell and organellar membranes, such as those on the endoplasmic reticulum (ER), regulate calcium concentrations inside the cell. They remain closed, keeping the cytosolic calcium levels low at a resting state.
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Mechanically-gated ion channels are proteins found in eukaryotic and prokaryotic cell membranes that open in response to mechanical stress. Tension, compression, swelling, and shear stress can alter the conformation of the protein, opening a transmembrane channel that allows the passage of ions for signal transmission. In eukaryotes, mechanically-gated channels are distributed in several regions like the neurons, lungs, skin, bladder, and heart, where they play critical roles in numerous...
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TMCO1は,負荷活性化Ca2+チャネルである

Qiao-Chu Wang1, Qiaoxia Zheng1, Haiyan Tan2

  • 1State Key Laboratory of Membrane Biology, Institute of Zoology, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing 100101, China.

Cell
|May 24, 2016
PubMed
まとめ

エンドプラズマ網膜 (ER) のタンパク質TMCO1は,カルシウム負荷活性化カルシウムチャネル (CLAC) として作用し,ERのカルシウム貯蔵庫が過剰に満たされないようにします. この発見は 細胞内のカルシウムホメオスタシスと それに関連する発達障害の 洞察力を提供します

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科学分野:

  • 細胞生物学
  • 分子生物学
  • バイオ物理学

背景:

  • 細胞のシグナル伝達と機能には,内プラズマ網 (ER) のカルシウム (Ca2+) ホメオスタシスの維持が不可欠である.
  • Ca2+放出活性化Ca2+ (CRAC) チャンネルはER貯蔵庫を充填するが,ER Ca2+過負荷を防ぐメカニズムは不明である.

研究 の 目的:

  • ER Ca2+レベルの調節におけるTMCO1の役割を調査する.
  • ERのCa2+過負荷を防ぐのに関与する潜在的なCa2+チャネルとしてTMCO1を特徴づける.

主な方法:

  • ER Ca2+の調節におけるTMCO1の機能を研究した.
  • Ca2+レベルに対応するTMCO1のオリゴメリゼーション状態を調査した.
  • 巨大リポソームのTMCO1チャネル活性を再構成した.
  • ノックアウトマウスモデルでTMCO1の機能を調べた.

主要な成果:

  • TMCO1は,ER Ca2+貯蔵庫の過剰充填を防ぐERトランスメブランタンパク質です.
  • TMCO1はCa2+負荷活性化チャネル (CLAC) として機能する.
  • TMCO1は,ER Ca2+の過負荷で逆行性テトラメリゼーションを経験し,枯渇すると解体する.
  • TMCO1ノックアウトマウスは,ER Ca2+の誤った処理と,脳機能胸部機能不全スペクトルの特徴を示しています.

結論:

  • TMCO1は,ER Ca2+の過剰充填に対する重要な保護メカニズムとして機能します.
  • TMCO1機能不全は,脳機能不全スペクトル障害と関連しています.
  • TMCO1は,Ca2+調節障害を理解し,治療するための新しいターゲットです.