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Assembly of Signaling Complexes01:30

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Multiprotein signaling complexes are formed in a dynamic process involving protein-protein interactions at the cytoplasmic domain of transmembrane receptors or enzymatic and non-enzymatic proteins associated with the receptor. These complexes ensure the activation and propagation of intracellular signals that regulate cell functions.
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Phosphoinositides and PIPs01:42

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Phosphoinositides are a group of phospholipids containing a glycerol backbone with two fatty acid chains and a phosphate attached to a myoinositol sugar ring. The inositol head group extends into the cytoplasm, where it is modified by adding phosphate groups to form phosphatidylinositol phosphates or PIPs.
Different phosphoinositides are synthesized and recruited on the cytosolic face of the plasma membrane. The localization of specific phosphoinositides concentrated in separate membrane...
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Protein Kinases and Phosphatases02:54

Protein Kinases and Phosphatases

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Proteins undergo chemical modifications that trigger changes in the charge, structure, and conformation of the proteins. Phosphorylation, acetylation, glycosylation, nitrosylation, ubiquitination, lipidation, methylation, and proteolysis are various protein modifications that regulate protein activity. Such modifications are usually enzyme-driven.
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Many proteins in the cell are regulated by phosphorylation, the addition of a phosphate group. A family of enzymes called kinases...
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Coat Assembly and GTPases01:33

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Vesicles incorporate different coat protein subunits in different cell locations, which changes the properties of the coat, such as the shape and geometry of the transport vesicles. Thus, vesicle coat proteins also play a significant role in cargo selection.
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Protein Complex Assembly

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Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types.  Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes.
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Clathrin-coated vesicles use endocytosis to transport receptors and lysosomal hydrolases from the Golgi to the lysosome in the late secretory pathway. Clathrin-mediated endocytosis was the first described endocytic process, and Clathrin-coated vesicles remain one of the most well-studied transport vesicles. The molecular machinery that generates clathrin-coated vesicles comprises over 50 proteins that precisely coordinate vesicle formation. Cell surface receptors concentrated in indented sites...
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フォスフォカビタンによるタンパク質認識と組み立て

Colin P Wren1, Ronan J Flood1, Niamh M Mockler1

  • 1School of Biological and Chemical Sciences, University of Galway, Galway H91 TK33, Ireland.

Journal of the American Chemical Society
|July 22, 2025
PubMed
まとめ

新しいリン酸を含有するマクロサイクルであるフォスフォカビタン (pctx) は,選択的にN末端残基とアルギニンを結合することにより,制御されたタンパク質組成を可能にします. この発見は タンパク質の結晶工学と 生物材料の製造に 新たな道を開きます

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In Vitro Analysis of PDZ-dependent CFTR Macromolecular Signaling Complexes
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科学分野:

  • 生物化学
  • 材料科学
  • クリスタルグラフィー

背景:

  • 制御されたタンパク質の組み立ては 先進的な生体材料にとって極めて重要です
  • タンパク質工学のための新しい分子ツールの開発は不可欠です

研究 の 目的:

  • リン酸を含有するマクロサイクル,フォスフォカビタン (pctx) のタンパク質認識と組み立て能力を調査する.
  • タンパク質の結晶工学におけるPCTXの可能性を 探求するためです

主な方法:

  • 原子解像度のX線微分法で複雑な構造を特定する.
  • Ralstonia solanacearum lectin (RSL) やライソジームなどのタンパク質でpctxの共結晶化.
  • アルギニン濃縮RSLを用いたシステム制御実験.

主要な成果:

  • C3対称のフォスフォカビタン (pctx) は選択的にN末端残基とアルギニンを結合するが,ライシンを結合しない.
  • X線 difraktionは,pctxがRSLのN端で四面体群を形成し,タンパク質の組み立てを容易にしたことを明らかにした.
  • pctxは,様々な沈殿物,pH範囲,および亜鉛複合物との相容性を示した.
  • アルギニンに富んだRSLとリゾジムは, pctxによる選択的アルギニン結合により,組み立てが変化した.
  • 拡張されたN末端と亜鉛結合による設計されたRSLは,ケージのような基底構造を生成するトリメア pctxクラスターを形成した.

結論:

  • フォスフォカビタン (pctx) は,特定のアミノ酸残基の多用途受容体として作用し,制御されたタンパク質組成を可能にします.
  • タンパク質結合能力と組み合わせたpctxの自己組み立ては,タンパク質結晶工学の新しい戦略を提供します.
  • このアプローチは タンパク質ベースのバイオマテリアルを製造するための 新しい経路を提供します