関連する実験動画
Updated: May 7, 2026
09:16
Oligopeptide Competition Assay for Phosphorylation Site Determination
Published on: May 18, 2017
リン酸化は,ミオシン構造と細胞骨格との関連を調節することによって,ブラシの境界の運動性を制御します
Cell
|December 1, 1983
まとめ
リン酸化は,ミオシンを調節することによって,ブラシの境界の運動性を制御します.
科学分野:
- 細胞生物学 細胞生物学
- 細胞骨格ダイナミクス
- 皮質生物学 エピテリア生物学
背景:
- 腸内皮質細胞のブラシ境界線 (BB) は,非筋肉細胞の運動性のモデルとして機能します.
- BB運動の調節を理解することは,細胞生物学にとって極めて重要です.
研究 の 目的:
- BBの運動性を調節するミオシンリン酸化の役割を調査する.
- BB収縮中の細胞骨格とミオシンの関連を解明する.
主な方法:
- ミオシンのリン酸化レベルの分析.
- 細胞骨格とミオシンの関連性の評価.
- 様々な核酸基板 (ATP,ITP,GTP,ATPγS) がBB収縮とミオシン動態に及ぼす影響に関する研究.
主要な成果:
- ミオシンは,非酸化された場合にのみ,細胞骨格と結合する.
- ミオシンライトチェーンキナーゼ基板は,細胞骨格からリン酸化されたミオシンフィラメントを放出します.
- ATPまたはITPとATPγSの混合物がBB収縮を誘導する.
- ITPとGTP単独では,BB収縮,ミオシン放出,またはリン酸化を誘発しません.
結論:
- リン酸化は,BBにおける細胞骨格とミオシンの結合の重要な調節因子である.
- ミオシンは,脱リン酸化されたとき,アクチン-ミオシンの部位に結合しません.
- リン酸化ミオシンはフィラメントを形成し,運動とBB収縮を促進します.
関連する概念動画
01:02Phosphorylation
The addition or removal of phosphate groups from proteins is the most common chemical modification that regulates cellular processes. These modifications can affect the structure, activity, stability, and localization of proteins within cells as well as their interactions with other proteins.
During phosphorylation, protein kinases transfer the terminal phosphate group of ATP to specific amino acid side chains of substrate proteins. Serine, threonine, and tyrosine are the most commonly...
During phosphorylation, protein kinases transfer the terminal phosphate group of ATP to specific amino acid side chains of substrate proteins. Serine, threonine, and tyrosine are the most commonly...
02:54Protein Kinases and Phosphatases
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.
Protein kinases
Many proteins in the cell are regulated by phosphorylation, the addition of a phosphate group. A family of enzymes called kinases...
Protein kinases
Many proteins in the cell are regulated by phosphorylation, the addition of a phosphate group. A family of enzymes called kinases...
01:42Phosphoinositides and PIPs
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...
Different phosphoinositides are synthesized and recruited on the cytosolic face of the plasma membrane. The localization of specific phosphoinositides concentrated in separate membrane...
01:39Mechanism of Filopodia Formation
Filopodia are thin, actin-rich cellular protrusions that play an important role in many fundamental cellular functions. They vary in their occurrence, length, and positioning in different cell types, suggesting their diverse roles.
Their main function is to guide migrating cells during normal tissue morphogenesis or cancer metastasis by recognizing and making initial contacts with the extracellular matrix. However, they can also act as stationary cell anchors or help to establish communication...
Their main function is to guide migrating cells during normal tissue morphogenesis or cancer metastasis by recognizing and making initial contacts with the extracellular matrix. However, they can also act as stationary cell anchors or help to establish communication...
01:18Role of Myosin in Cell Migration
Myosins are multimeric motor proteins involved in various cellular processes such as migration, adhesion, and proliferation. Myosin II is the most common type in animal cells, which binds and cross-links actin filaments.
Myosin II is a hexamer comprising two heavy chains with globular heads and coiled-coil tails, two regulatory light chains, and two essential light chains. The ATPase sites on the myosin heads hydrolyze ATP, and the released phosphate generates the force for contraction. It is...
Myosin II is a hexamer comprising two heavy chains with globular heads and coiled-coil tails, two regulatory light chains, and two essential light chains. The ATPase sites on the myosin heads hydrolyze ATP, and the released phosphate generates the force for contraction. It is...
01:32Cytoskeletal Coordination in Cell Migration
A migrating cell changes its shape during the cyclic events of attachment and detachment from the substratum and repositions the cell organelles correspondingly. These complex events are orchestrated by the dynamic cytoskeletal network comprising actin filaments, intermediate filaments, and microtubules. Cytoskeletal crosstalk — the direct and indirect communication between the different components — is crucial for this coordination. Direct communication involves various linker proteins that...