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関連する概念動画

Protein Complexes with Interchangeable Parts01:57

Protein Complexes with Interchangeable Parts

Groups of proteins may form a complex where each protein in this complex has a different role in the overall execution of the complex’s function. Often some of the proteins in the complex can be replaced by a closely related variant to give a complex that contains many of the same components yet is functionally distinct.
The SCF ubiquitin ligase is a protein complex of five individual proteins. This complex attaches ubiquitin to other target proteins to mark them for degradation. In order to...
Newman Projections02:06

Newman Projections

Different notations are used to represent the three-dimensional structure of molecules on two-dimensional surfaces. One of the most commonly used representations is the dash-wedge formula. The dashed wedges, solid wedges, and the plane lines indicate the groups situated behind the plane, coming out of the plane, and in the plane, respectively.
The organic molecules rotate across the single bonds leading to numerous temporary three-dimensional structures of varying energy known as conformers.
Fischer Projections02:18

Fischer Projections

Learning to draw Fischer projections of molecules and understanding their relevance plays a crucial role in the visual depiction of organic molecules. A Fischer projection is a two-dimensional projection on a planar surface to simplify the three-dimensional wedge–dash representation of molecules. This is especially helpful in the case of molecules with multiple chiral centers that can be difficult to draw. Here, all the bonds of interest are represented as horizontal or vertical lines. While...
Protein Complexes with Interchangeable Parts01:57

Protein Complexes with Interchangeable Parts

Groups of proteins may form a complex where each protein in this complex has a different role in the overall execution of the complex’s function. Often some of the proteins in the complex can be replaced by a closely related variant to give a complex that contains many of the same components yet is functionally distinct.
The SCF ubiquitin ligase is a protein complex of five individual proteins. This complex attaches ubiquitin to other target proteins to mark them for degradation. In order to...
Electron Microscope Tomography and Single-particle Reconstruction01:07

Electron Microscope Tomography and Single-particle Reconstruction

Transmission electron microscopy (TEM) can be used to determine the 3D structure of biological samples with the help of techniques such as electron microscope tomography and single-particle reconstruction. While single-particle reconstruction can examine macromolecules and macromolecular complexes in vitro conditions only, tomography permits the study of cell components or small cells in vivo.
Electron Tomography
Electron tomography can be performed either in TEM or STEM (scanning transmission...
Three-Dimensional Microscopy in Microbiology01:28

Three-Dimensional Microscopy in Microbiology

Three-dimensional imaging techniques are essential in cell biology, allowing researchers to visualize intricate cellular structures with high resolution. Two prominent methods, Differential Interference Contrast Microscopy (DIC) and Confocal Scanning Laser Microscopy (CSLM), provide distinct advantages for imaging live and thick specimens, respectively.Differential Interference Contrast MicroscopyDIC microscopy enhances contrast in transparent, unstained samples by converting phase...

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関連する実験動画

Updated: Jul 19, 2026

Hi-C: A Method to Study the Three-dimensional Architecture of Genomes.
22:27

Hi-C: A Method to Study the Three-dimensional Architecture of Genomes.

Published on: May 6, 2010

グアニンヌクレオチド結合スイッチは3次元で表示されます.

I R Vetter1, A Wittinghofer

  • 1Max-Planck-Institut für Molekulare Physiologie, 44227 Dortmund, Germany.

Science (New York, N.Y.)
|November 10, 2001
PubMed
まとめ

グアニンヌクレオチド結合タンパク質は,分子スイッチとして作用し,細胞の重要なプロセスを調節するために,不活性状態と活性状態の間のサイクルをします. 基本的な構造は保たれているが,レギュレータとエフェクターには様々な相互作用がある.

科学分野:

  • 分子生物学は分子生物学である.
  • セルラー・シグナリング
  • バイオケミストリー バイオケミストリー

背景:

  • グアニン核酸結合タンパク質 (G-タンパク質) は,感覚的知覚,タンパク質合成,輸送,細胞成長を含む多様な細胞機能の重要な調節体です.
  • これらのタンパク質は分子スイッチとして機能し,不活性なグアノシン二酸化リン酸 (GDP) に結合した形態と活性なグアノシン三酸化リン酸 (GTP) に結合した形態を交互に交換します.
  • Gタンパク質の調節の構造的基礎を理解することは,健康と病気におけるそれらの役割を解読する鍵です.

研究 の 目的:

  • グアニン核酸結合タンパク質の調節を左右する基本的な原理を定義する.
  • Gタンパク質スイッチ装置の保存された性質を探求するために.
  • Gタンパク質の調節体と効果体の構造と相互作用の様子の多様性を調査する.

主な方法:

  • 構造生物学技術 (例えば,X線結晶学,冷凍EM) がGタンパク質の構造を分析するために使用されました.
  • 生化学的測定法を使用して,GDPとGTPに縛られた状態のサイクリングを研究しました.
  • 様々なGタンパク質のレギュレータとエフェクターを比較分析した.

主要な成果:

  • 構造研究は,Gタンパク質のスイッチ装置のための保存された基本モジュールを明らかにします.

さらに関連する動画

Analyzing and Building Nucleic Acid Structures with 3DNA
16:24

Analyzing and Building Nucleic Acid Structures with 3DNA

Published on: April 26, 2013

Investigating Protein Sequence-structure-dynamics Relationships with Bio3D-web
09:51

Investigating Protein Sequence-structure-dynamics Relationships with Bio3D-web

Published on: July 16, 2017

関連する実験動画

Last Updated: Jul 19, 2026

Hi-C: A Method to Study the Three-dimensional Architecture of Genomes.
22:27

Hi-C: A Method to Study the Three-dimensional Architecture of Genomes.

Published on: May 6, 2010

Analyzing and Building Nucleic Acid Structures with 3DNA
16:24

Analyzing and Building Nucleic Acid Structures with 3DNA

Published on: April 26, 2013

Investigating Protein Sequence-structure-dynamics Relationships with Bio3D-web
09:51

Investigating Protein Sequence-structure-dynamics Relationships with Bio3D-web

Published on: July 16, 2017

  • Gタンパク質のレギュレータの構造と相互作用の方法には大きな多様性があります.
  • これらの発見は,さまざまな規制戦略と並行して保存されたメカニズムを強調しています.

    • 結論:

    • 保存されたスイッチモジュールは,Gタンパク質機能の基本的メカニズムを提供します.
    • レギュレータとエフェクターの多様性は,専門的で微調整された細胞反応を可能にします.
    • これらの原理に関するさらなる研究は,複雑な生物学的プロセスにおけるGタンパク質の役割を明らかにします.