カルモジュリンは,プロテアゼ依存メカニズムを通じて,L-セレクチン粘着分子の発現と機能を調節する.
J Kahn1, B Walcheck, G I Migaki
1Boehringer Ingelheim Pharmaceuticals, Inc., Department of Immunological Diseases, Ridgefield, Connecticut 06877, USA.
Cell
|April 7, 1998
まとめ
カルモジュリンは,細胞粘着分子であるL-セレクチンに直接結合します. カルモジュリンを阻害すると,タンパク質分解経由でL-セレクチン分泌を誘発し,細胞表面タンパク質の新たな調節機構を明らかにする.
科学分野:
- 分子細胞生物学 分子細胞生物学
- 免疫学 免疫学とは
- 粘着分子のシグナル伝達
背景:
- 粘着分子であるL-セレクチンは,細胞活性化時に急速に下調されます.
- このダウンレギュレーションは,膜近接部位でのタンパク質分解によって起こります.
研究 の 目的:
- L-セレクチン発現と機能の調節におけるカルモジュリンの役割を調査する.
- カルモジュリンがL-セレクチンタンパク質分解に影響を与えるメカニズムを解明する.
主な方法:
- コプレシピテーションアッセイは,カルモジュリンとL-セレクチンとの相互作用を証明する.
- カルモジュリン阻害剤とメタロプロテアゼ阻害剤の使用は,L-セレクチン流出を研究するために.
- L-セレクチン発現と粘着の分析 実験的な操作で.
主要な成果:
- カルモジュリンは,L-セレクトインの細胞質領域と直接関連しています.
- カルモジュリン阻害剤は,細胞表面からL-セレクチンのタンパク質分解性放出を誘導する.
- この流出は,メタロプロテアゼ阻害剤によって予防可能であり,プロテアゼに依存する経路を意味する.
結論:
- カルモジュリンは,タンパク質分解による細胞表面タンパク質発現と機能を調節する新しい役割を果たします.
- このメカニズムは,タンパク質の細胞プラズマ領域と直接の相互作用を伴う.
- この発見は,調節されたタンパク質分解を経験している他の細胞表面タンパク質に対する潜在的より広範な影響を示唆しています.
関連する概念動画
Calmodulin-dependent Signaling
5.0K
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,...
The Ca2+-CaM complex does not have enzymatic activity by itself. Instead, the complex binds downstream target proteins, including membrane proteins or enzymes,...
5.0K
Role of Matrix Metalloproteases in Degradation of ECM
2.9K
Matrix metalloproteases (MMPs) are enzymes involved in the hydrolysis of proteins and glycoproteins of the extracellular matrix. MMPs are essential for the migration and proliferation of cells through the dense matrix network, throughout embryonic development, and throughout morphogenesis. The first MMP activity discovered was a collagenase in a tadpole's tail undergoing metamorphosis. The active collagen deposition and modifications lead to the morphogenesis of tadpoles into the adult...
2.9K
Laminins are the Adhesive Proteins of Basal Lamina
3.4K
Laminins are heterotrimeric proteins with high molecular mass found in the extracellular matrix. Each laminin molecule is composed of three chains, viz. alpha, beta, and gamma, coded by five, four, and three paralogous genes, respectively. Laminins are categories based on the compositions of the three chains.
In humans, the five forms of alpha chains are LAMA 1, LAMA 2, LAMA 3, LAMA 4, and LAMA 5. The four forms of beta chains are LAMB 1, LAMB 2, LAMB 3, and LAMB 4. The three forms of gamma...
In humans, the five forms of alpha chains are LAMA 1, LAMA 2, LAMA 3, LAMA 4, and LAMA 5. The four forms of beta chains are LAMB 1, LAMB 2, LAMB 3, and LAMB 4. The three forms of gamma...
3.4K
Intracellular Signaling Affects Focal Adhesions
2.8K
Integrins act both as extracellular input receivers and as intracellular processing activators. As their name suggests, integrins are entirely integrated into the membrane structure. Their hydrophobic membrane-spanning regions interact with the phospholipid bilayer's hydrophobic region. These membrane receptors provide extracellular attachment sites for effectors like hormones and growth factors. They activate intracellular response cascades when their effectors are bound and active.
Some...
Some...
2.8K
Selectins
3.6K
Cell adhesion is an essential aspect of multicellularity. While stable cell interactions usually occur between cells of the same type, transient cell interactions occur between cells of different tissue types, such as between neutrophils and endothelial cells. Selectins are one class of cell adhesion molecules (CAMs) that bind carbohydrate ligands to form transient cell adhesion. They are rod-like proteins with a long extracellular part of variable length ending with the lectin domain,...
3.6K
Immunoglobulin-like Cell Adhesion Molecules
3.3K
Immunoglobulin-like cell adhesion molecules or Ig-CAMs are a versatile group of cell surface glycoproteins belonging to the immunoglobulin protein superfamily. Ig-CAMs possess the characteristic immunoglobulin protein domains and other domains such as the fibronectin type III domain. The Ig domains are glycosylated to varying degrees in different Ig-CAMs.
Ig-CAMs exhibit either homophilic binding (to other Ig-CAMs) or heterophilic binding (to other ligands such as integrins). While most Ig-CAMs...
Ig-CAMs exhibit either homophilic binding (to other Ig-CAMs) or heterophilic binding (to other ligands such as integrins). While most Ig-CAMs...
3.3K


