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Amplifying Signals via Second Messengers01:15

Amplifying Signals via Second Messengers

Many receptor binding ligands are hydrophilic; they do not cross the cell membrane but bind to cell-surface receptors. Thus, their message must be relayed by second messengers present in the cell cytoplasm. There are several second messenger pathways, each with its own way of relaying information. For example, the G protein-coupled receptors can activate both phosphoinositol and cyclic AMP (cAMP) second messenger pathways. The phosphoinositol pathway is active when the receptor induces...
Feedback Regulation of Calcium Concentration01:27

Feedback Regulation of Calcium Concentration

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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Calmodulin-dependent Signaling01:16

Calmodulin-dependent Signaling

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.
The Ca2+-CaM complex does not have enzymatic activity by itself. Instead, the complex binds downstream target proteins, including membrane proteins or enzymes,...
Smooth Muscle Contraction01:25

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Smooth muscle contraction is a complex process vital for various bodily functions, from maintaining blood vessel tension to facilitating the movement of food through the digestive tract. Unlike striated muscles, smooth muscle contraction begins more slowly and lasts longer.
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Pull-down of Calmodulin-binding Proteins
07:51

Pull-down of Calmodulin-binding Proteins

Published on: January 23, 2012

カルモジュリンは,カルシウムと結合せずに機能できますか?

J R Geiser1, D van Tuinen, S E Brockerhoff

  • 1Department of Biochemistry, University of Washington, Seattle 98195.

Cell
|June 14, 1991
PubMed
まとめ
この要約は機械生成です。

カルモジュリン (CaM) は酵母菌の成長に不可欠ですが,驚くべきことに,カルシウムイオン (Ca2+) を結合せずにこの重要な機能を果たすことができます. Ca2+結合能力が欠けている突然変異のCaMタンパク質は,まだ酵母の生存能力をサポートしており,以前の理解に挑戦しています.

さらに関連する動画

Monitoring ER/SR Calcium Release with the Targeted Ca2+ Sensor CatchER+
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Fluorescent Calcium Imaging and Subsequent In Situ Hybridization for Neuronal Precursor Characterization in Xenopus laevis
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Fluorescent Calcium Imaging and Subsequent In Situ Hybridization for Neuronal Precursor Characterization in Xenopus laevis

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関連する実験動画

Last Updated: May 12, 2026

Pull-down of Calmodulin-binding Proteins
07:51

Pull-down of Calmodulin-binding Proteins

Published on: January 23, 2012

Monitoring ER/SR Calcium Release with the Targeted Ca2+ Sensor CatchER+
12:30

Monitoring ER/SR Calcium Release with the Targeted Ca2+ Sensor CatchER+

Published on: May 19, 2017

Fluorescent Calcium Imaging and Subsequent In Situ Hybridization for Neuronal Precursor Characterization in Xenopus laevis
09:07

Fluorescent Calcium Imaging and Subsequent In Situ Hybridization for Neuronal Precursor Characterization in Xenopus laevis

Published on: February 18, 2020

科学分野:

  • 分子生物学は分子生物学である.
  • 細胞生物学 細胞生物学
  • バイオケミストリー バイオケミストリー

背景:

  • カルモジュリン (CaM) は,カルシウム (Ca2+) を結合する重要なタンパク質です.
  • CaMは細胞内Ca2+受容体として作用し,Ca2+信号を細胞の反応に媒介する.

研究 の 目的:

  • カルモジュリンの本質的な機能におけるCa2+結合の役割を調査する.
  • 酵母菌におけるカルモジュリンの成長促進作用のためにCa2+結合が必要かどうかを判断する.

主な方法:

  • サイト指向型変異は,酵母カルモジュリン内のCa2+結合ループを変更するために使用されました.
  • 変異したカルモジュリンタンパク質は,Ca2+結合親和性と構造変化について分析されました.
  • 変異カルモジュリンを発現した酵母菌株やカルモジュリンを欠いた酵母菌株の生存能力と成長を評価した.

主要な成果:

  • 変異したカルモジュリンには,Ca2+結合親和性が著しく低下した.
  • 1つの変異体は検出可能なCa2+結合を示さなかった.
  • 変異したカルモジュリンは,Ca2+への反応として形状を変えたものはなかった.
  • 変異カルモジュリンを持つ酵母菌株は生き残り,うまく成長しました.
  • カルモジュリン遺伝子を削除した酵母菌株は生存不可能でした.

結論:

  • カルモジュリンは酵母菌の成長に不可欠です.
  • カルモジュリンは,Ca2+結合とは独立して,成長をサポートする重要な機能を果たすことができます.
  • これらの発見は,Ca2+依存カルモジュリン構造変化によるCa2+信号伝導の確立されたモデルに異議を唱える.