SH2-キナーゼドメインの構造的結合は,FesとAbl基板の認識とキナーゼ活性化をリンクします
Panagis Filippakopoulos1, Michael Kofler, Oliver Hantschel
1Structural Genomics Consortium, University of Oxford, Old Road Campus, Roosevelt Drive, Oxford OX3 7DQ, UK.
Cell
|September 9, 2008
まとめ
FesとAblチロシンキナーゼのSH2ドメインは,キナーゼドメインと相互作用することによってシグナル伝達を強化します. この構造的統合は,これらのプロ腫瘍性キナーゼのキナーゼ活性化と基板認識に不可欠です.
科学分野:
- バイオケミストリー バイオケミストリー
- 分子生物学は分子生物学である.
- 構造生物学 構造生物学とは
背景:
- サイトプラズマチロシンキナーゼ活性と基板認識の強化におけるSH2ドメインの役割は完全に理解されていません.
- タイロシンキナーゼは,様々な細胞プロセスに関与する重要なシグナル伝達タンパク質です.
研究 の 目的:
- SH2ドメインがFesとAblチロシンキナーゼの活性に影響を与える分子メカニズムを解明する.
- SH2ドメイン媒介活性化と基板認識の構造的基礎を決定する.
主な方法:
- 人間のFesチロシンキナーゼのSH2-キナーゼ単体の構造を解明するためのX線結晶学.
- FesとAblキナーゼにおけるキナーゼドメインとSH2ドメインの相互作用の構造分析.
主要な成果:
- フェスキナーゼのSH2ドメインはN末端の葉と相互作用し,リガンド結合によって安定したアルファCヘリクスを活性化させる.
- フェスキナーゼの活性化は,協力的なSH2-キナーゼ-基板相互作用を通じて基板認識と結合されます.
- また,AblキナーゼのSH2ドメインは,独特のSH2-キナーゼインターフェイスを通じて,触媒活性と基板リン酸化を刺激する.
結論:
- 活性フェスキナーゼとアブルキナーゼのSH2および触媒ドメインは,チロシンキナーゼシグナル伝達に不可欠な統合構造を形成する.
- SH2ドメイン-キナーゼの相互作用は,これらのプロ腫瘍性キナーゼの触媒活性と基板特異性を調節するために重要である.
関連する概念動画
Conservation of Protein Domains Over Different Proteins
11.8K
Protein domains are small structurally independent units that are part of a single amino acid chain. Although these domains are often structurally independent, they may rely on synergistic effects to perform their functions as part of a larger protein. Protein domains may be conserved within the same organism, as well as across different organisms.
A limited set of protein domains often duplicate and recombine during evolution. These domains can be organized in different combinations to...
A limited set of protein domains often duplicate and recombine during evolution. These domains can be organized in different combinations to...
11.8K
Cytoskeletal Linker Proteins - Plakins
2.0K
Plakins are large proteins with binding domains for microtubules, microfilaments, intermediate filaments, and membrane-associated protein complexes at cell junctions. Plakin functions are evolutionarily conserved and are primarily involved in organizing the different components of the cytoskeleton by crosslinking them to each other and connecting them to the cell-matrix and cell adhesion complexes. They are also known to interact with signal transducers, serve as scaffolds for signaling...
2.0K
Fusion of Secretory Vesicles with the Plasma Membrane
16.0K
Proteins and neurotransmitters in secretory vesicles can be released from a cell upon vesicle docking, priming, and fusion with the plasma membrane. Vesicles are docked and primed in preparation for the quick exocytosis of their contents in response to a stimulus. The fusion process is mainly carried out by a SNAP Receptor or SNARE complex, consisting of synaptobrevin, syntaxin-1, and SNAP-25.
In 1993, Jim Rothman proposed that the antiparallel pairing of vesicular and transmembrane SNAREs, or...
In 1993, Jim Rothman proposed that the antiparallel pairing of vesicular and transmembrane SNAREs, or...
16.0K
SNAREs and Membrane Fusion
10.5K
Once a transport vesicle has recognized its target organelle, the vesicular membrane needs to fuse with the target membrane to unload the cargo. Transmembrane proteins called SNAREs present on organelle membranes and their vesicles, mediate vesicle fusion.
SNAREs exist in pairs that symmetrically interact and catalyze the fusion of the lipid bilayers in vesicle and target organelle. v-SNARE in the vesicle membrane are single polypeptide chains that bind to a complementary t-SNARE, composed of 2...
SNAREs exist in pairs that symmetrically interact and catalyze the fusion of the lipid bilayers in vesicle and target organelle. v-SNARE in the vesicle membrane are single polypeptide chains that bind to a complementary t-SNARE, composed of 2...
10.5K
Assembly of Signaling Complexes
4.7K
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.
Interaction domains in cell signaling
Interaction domains recognize exposed features of their binding partners containing post-translationally modified sequences,...
Interaction domains in cell signaling
Interaction domains recognize exposed features of their binding partners containing post-translationally modified sequences,...
4.7K
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


