ダイナミンテトラメアの結晶構造
Thomas F Reubold1, Katja Faelber2, Nuria Plattner3
1Institut für Biophysikalische Chemie, Medizinische Hochschule Hannover, Carl-Neuberg-Str. 1, 30625 Hannover, Germany.
Nature
|August 25, 2015
まとめ
メカノケミカルなタンパク質ダイナミン
科学分野:
- 生物化学
- 分子生物学
- 細胞生物学
背景:
- 大量のGTPaseであるダイナミンは,細胞プロセスにおける膜再構成に不可欠です.
- ダイナミンのテトラムはオリゴメリズされ,クラスリンで覆われた小胞を収縮して切断する.
- ダイナミンの組立と調節のための分子基礎は,まだ完全に理解されていません.
研究 の 目的:
- ダイナミンの組立と調節の分子決定因子を明らかにする.
- 人間のダイナミンテトラメールの高解像度構造を提示します.
- ダイナミンの構造と機能を 細胞のプロセスや病気と結びつけるため
主な方法:
- ヒトダイナミンテトラメアのX線結晶図 (核酸無状態)
- タンパク質の機能と相互作用を評価するための変異研究
- オリゴメリゼーションアッセイと分子動力学シミュレーションによるマルコフ状態モデル.
主要な成果:
- 人間のダイナミンテトラメアの結晶構造が決定された.
- ダイナミンのオリゴメリゼーションと自己抑制の放出を結びつけるメカニズムが提案された.
- テトラマー形成と自己抑制に影響する突然変異は神経筋疾患と関連しています.
結論:
- 曲ったテトラメアの構造はダイナミンの螺旋組成と膜収縮の役割を説明する.
- ダイナミンの分子機構を理解することで 細胞機能の洞察が得られます
- この研究は,ダイナミンの作用による先天性筋肉障害の構造的基礎を明らかにしています.
関連する概念動画
Pinching-off of Coated Vesicles
4.4K
Vesicle budding is orchestrated by distinct cytosolic proteins such as adaptor proteins, coat proteins, and GTPases. To initiate vesicle budding, membrane-bending proteins containing crescent-shaped BAR domains bind to the lipid heads in the bilayer and distort the membrane to form a protein-coated vesicle bud. Adaptors proteins such as AP2 for clathrin-coated vesicles can nucleate on the deformed membrane. Finally, coat proteins such as clathrin or COPI and COPII assemble into a coat forming...
4.4K
ATP Synthase: Structure
17.7K
ATP synthase or ATPase is among the most conserved proteins found in bacteria, mammals, and plants. This enzyme can catalyze a forward reaction in response to the electrochemical gradient, producing ATP from ADP and inorganic phosphate. ATP synthase can also work in a reverse direction by hydrolyzing ATP and generating an electrochemical gradient. Different forms of ATP synthases have evolved special features to meet the specific demands of the cell. Based on their specific feature, ATP...
17.7K
Crystal Field Theory - Tetrahedral and Square Planar Complexes
49.7K
Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
49.7K
Structure of Cadherins
5.2K
The cadherins were one of the first cell adhesion molecules discovered; the term “cadherins” is based on their calcium-dependent adhering properties. The first cadherins discovered on the epithelial, neuronal, and placental cells were named E-cadherin, P-cadherin, and N-cadherin, respectively. These classical cadherins share sequence and structural similarities. Other cadherins, including those involved in cell signaling, are grouped into non-classical cadherins. This...
5.2K
Ionic Crystal Structures
21.1K
Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
21.1K
Clathrin Coated Vesicles
10.1K
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...
10.1K


