関連する実験動画
Updated: Jun 23, 2026

09:52
Visualizing Neuroblast Cytokinesis During C. elegans Embryogenesis
Published on: March 13, 2014
Par複合体は,細胞骨格タンパク質Lglglをリン酸化することによって,非対称な細胞分裂を誘導する
Jörg Betschinger1, Karl Mechtler, Juergen A Knoblich
1Research Institute of Molecular Pathology, Dr Bohr Gasse 7, 1030 Vienna, Austria.
Nature
|March 12, 2003
まとめ
Parタンパク質複合体は,Lethal (2) 巨大幼虫 (Lgl) をリン酸化することによって,細胞の運命決定因子の誤局化を防ぐ. このリン酸化はLglの活動を制限し,ドロソフィラのニューロブラストにおける適切な細胞分裂と子細胞運命を決定します.
科学分野:
- 細胞生物学 細胞生物学
- 発達生物学 発達生物学について
- 遺伝学 遺伝学とは
背景:
- 細胞の非対称性は,発達中に多様な細胞タイプを生成するために不可欠です.
- ドロソフィラのニューロブラストでは,Parタンパク質複合体がアピカル・ベース・ポラリティを確立し,細胞運命を決定する要素を娘細胞に誘導する.
- Par複合体がこの方向性タンパク質局所化を達成するメカニズムは不明である.
研究 の 目的:
- Parタンパク質複合体が細胞運命を決定する要素をミトーシス中の特定の子細胞に誘導する分子メカニズムを解明する.
- この過程におけるLethal (2) 巨大な幼虫 (Lgl) のタンパク質の役割を調査する.
主な方法:
- ドロソフィラのニューロブラストモデルを利用した.
- 遺伝子と生化学の実験に従事した.
- 研究されたタンパク質-タンパク質の相互作用とリン酸化イベント.
主要な成果:
- Par複合体のメンバーである非典型タンパク質キナーゼC (aPKC) がLgl.gl.をリン酸化することを実証しました.
- aPKC媒介のリン酸化が,膜とアクチン細胞骨格の結合からLglを放出することを示した.
- リン酸化Lglは,ミランダを含む細胞運命を決定する要素の頂点的局所化を防ぐことがわかった.
結論:
- aPKCによるLglのリン酸化は,細胞運命を決定する局所化をDrosophilaニューロブラストの基礎部に制限する重要なメカニズムです.
- このリン酸化イベントは,Lglの活動を空間的に調節し,非対称な細胞分裂の決定因子の正しい分離を保証します.
関連する概念動画
Mitogens and the Cell Cycle
Mitogens and their receptors play a crucial role in controlling the progression of the cell cycle. However, the loss of mitogenic control over cell division leads to tumor formation. Therefore, mitogens and mitogen receptors play an important role in cancer research. For instance, the epidermal growth factor (EGF) - a type of mitogen and its transmembrane receptor (EGFR), decides the fate of the cell's proliferation. When EGF binds to EGFR, a member of the ErbB family of tyrosine kinase...
The Phragmoplast
Cell division is essential for organismal growth and development. In animal cells, the central spindle and its associated proteins form the midbody, a structure that has an essential role in cytokinesis. In plants, the central spindle, along with the microtubules, actin, and other cell components, matures into the phragmoplast, which is necessary for cytokinesis. Unlike the stationary midbody, the phragmoplast expands centrifugally, eventually leading to the formation of the new cell wall.
The...
The...
Mechanism of Lamellipodia Formation
Cells migrating in response to external stimuli form lamellipodia, which are thin membrane protrusions supported by a mesh of linked, branched, or unbranched actin filaments. These actin filaments interact with myosin motor proteins, creating the dynamic actomyosin complex within the cytoskeleton. Contractility, or the ability to generate contractile stress, is inherent to the actomyosin complex. It helps cells detect the stiffness of the surrounding ECM and exert contractile force for...
Cell Motility through Blebbing
Blebs are a type of membrane protrusion formed by the internal hydrostatic pressure of the cytoplasm. Blebs are observed in several cell types, including fibroblasts, immune cells, and single-celled organisms like the amoeba. The primary function of blebs is cell locomotion and apoptosis, but they are also found during necrosis and cell division. The life cycle of a bleb comprises an initiation phase followed by the expansion and retraction phases.
Blebbing Through the Matrix
In multicellular...
Blebbing Through the Matrix
In multicellular...
Cytoskeletal 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...
Molecular Factors Affecting Cell Division
Several external and internal factors influence the initiation and inhibition of cell division. For instance, the death of nearby cells or the release of human growth hormone (hGH) promotes cell division. In contrast, lack of hGH or crowding of cells can inhibit cell division.
Several proteins function as internal regulators to ensure each cell cycle stage is completed faithfully before proceeding to the next. Regulator molecules may act directly or influence the activity or production of other...
Several proteins function as internal regulators to ensure each cell cycle stage is completed faithfully before proceeding to the next. Regulator molecules may act directly or influence the activity or production of other...

