関連する実験動画
Updated: May 19, 2026

07:43
Assaying Proteasomal Degradation in a Cell-free System in Plants
Published on: March 26, 2014
フォスファタゼVHZの活性部位におけるメタバナデート
Vyacheslav I Kuznetsov1, Anastassia N Alexandrova, Alvan C Hengge
1Department of Chemistry and Biochemistry, Utah State University, Logan, Utah 84322-0300, USA.
Journal of the American Chemical Society
|August 11, 2012
まとめ
バナダテート (Vanadate) とは
科学分野:
- バイオケミストリー バイオケミストリー
- 酵素学 酵素学とは
- 構造生物学 構造生物学とは
背景:
- バナダートは生物学的プロセスを調節し,酵素と相互作用します.
- モノメリックオルトヴァナダート (orthovanadate) は,フォスファタゼの阻害剤として知られています.
- オリゴメリックなヴァナダート形態は溶液にしばしば存在します.
研究 の 目的:
- ヴァナダートとVHZ.フォスファターゼの相互作用を調査する.
- VHZ-メタバナダート複合体の構造を分析する.
- 異なるフォスファターゼ複合体におけるヴァナデート結合モードを比較する.
主な方法:
- 1.14 Å の結晶構造の計算分析.
- 既存のヴァナデート・フォスファタゼ複合体のデータと比較.
- 結合と電子特性の分析.
主要な成果:
- VHZ複合体は,1つのアピカルリガンドを持つ平面的なメタバナドATEを特徴としています.
- 電子密度のギャップは,主にイオン的なV-S相互作用を示唆しています.
- 古典的なバナダート-リン酸塩複合体は,非局所的結合を示す.
結論:
- 酵素活性部位は,メタバナダートのようなバナダート種を生成することができます.
- バナダテの生物学的相互作用は,事前に形成された阻害性種にのみ依存するものではありません.
- 酵素触媒により,溶液に支配的なバナダートオリゴーマーを活性種に変換することができる.
関連する概念動画
ATP Driven Pumps III: V-type Pumps
V-type pumps are ATP-driven pumps found in the vacuolar membranes of plants, yeast, endosomal and lysosomal membranes of animal cells, plasma membranes of a few specialized eukaryotic cells, and some prokaryotes. They are also known as the V1Vo-ATPase, that couple ATP hydrolysis to transport protons against a concentration gradient.
The peripheral or cytosolic V1 domain with eight subunits is involved in ATP hydrolysis. The integral or transmembrane V0 domain containing at least five subunits...
The peripheral or cytosolic V1 domain with eight subunits is involved in ATP hydrolysis. The integral or transmembrane V0 domain containing at least five subunits...
Protein 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...
Protein 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...
Phosphorylation
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...
Phosphorylation
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...
Allosteric Proteins-ATCase
Binding sites linkages can regulate a protein's function. For example, enzyme activity is often regulated through a feedback mechanism where the end product of the biochemical process serves as an inhibitor.
Aspartate transcarbamoylase (ATCase) is a cytosolic enzyme that catalyzes the condensation of L-aspartate and carbamoyl phosphate to N-carbamoyl-L-aspartate. This reaction is the first step in pyrimidine biosynthesis. UTP and CTP, the end products of the pyrimidine synthesis pathway,...
Aspartate transcarbamoylase (ATCase) is a cytosolic enzyme that catalyzes the condensation of L-aspartate and carbamoyl phosphate to N-carbamoyl-L-aspartate. This reaction is the first step in pyrimidine biosynthesis. UTP and CTP, the end products of the pyrimidine synthesis pathway,...

