関連する実験動画
Updated: Jul 16, 2026

14:49
Associated Chromosome Trap for Identifying Long-range DNA Interactions
Published on: April 23, 2011
溶液中のヒトBCL-2プロモーター領域で形成される,並列/反並列G鎖を混合した内分子G四重複構造
Jixun Dai1, Thomas S Dexheimer, Ding Chen
1College of Pharmacy, University of Arizona, Tucson, 85721, USA.
Journal of the American Chemical Society
|January 26, 2006
まとめ
研究者らは,ヒトのbcl-2プロモーターで最初のG-四重複構造を発見した. 混合G鎖を持つこの新しい構造は,bcl-2遺伝子発現を調節する抗癌薬のための新しい標的を提供します.
科学分野:
- 構造生物学 構造生物学とは
- 分子腫瘍学 分子腫瘍学
- バイオケミストリー バイオケミストリー
背景:
- Bcl-2はアポトーシスを抑制するオンコタンパク質で,多くのヒト腫瘍で過剰発現しています.
- bcl-2プロモーター内のGC豊富な領域は,その転写を調節する.
- この領域は,複数の分子内G四重複体を形成することができる.
研究 の 目的:
- 人間のbcl-2プロモーターにおける支配的なG-四重複体の構造を決定する.
- このG-四重複体がbcl-2遺伝子発現にどのように影響するかを理解するために.
主な方法:
- 核磁気共鳴 (NMR) スペクトロスコピーは,G-四重複構造を研究するために使用されました.
- G-クアドルプレックス折り畳みとループ形成の分析.
主要な成果:
- 混合の並列/反並列G鎖を持つ新しい内分子G四重複体が特定されました.
- 構造には3つのGテトラド,ダブルチェーンの反転ループ,そして2つの横ループがあります.
- bcl-2プロモーターにある3核酸のCGCループが,その折り畳みを決定する.
結論:
- 特定されたbcl-2プロモーターG-quadruplexは,ユニークな折り畳みパターンを持っています.
- この構造は,c-MYC.のような他の腫瘍遺伝子の同様のモチーフと異なる.
- bcl-2 G-quadruplexは,抗がん薬の開発における潜在的な治療標的である.
関連する概念動画
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...
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...
Lampbrush Chromosomes
In 1882, Flemming observed lampbrush chromosomes (LBC) in salamander eggs. Later in 1892, Rückert observed LBCs in shark egg cells and coined the term "lampbrush chromosomes" because they looked like brushes used to clean kerosene lamps.
LBCs are made up of two pairs of conjugating homologous chromatids. Each chromatid consists of alternatively positioned regions of condensed-inactive chromatin and loosely placed-active side loops, which can be contracted and extended. The loops resemble the...
LBCs are made up of two pairs of conjugating homologous chromatids. Each chromatid consists of alternatively positioned regions of condensed-inactive chromatin and loosely placed-active side loops, which can be contracted and extended. The loops resemble the...
Type IV Collagen of Basal Lamina
Type IV collagen is a 400 nm long, network-forming collagen that acts as a barrier between the epithelial and endothelial cells. Type IV collagen forms the backbone of the basement membrane by scaffolding with laminin, entactin, proteoglycans, and fibronectin. Apart from rendering structural support to the basement membrane, it also helps entail signaling potentials necessary for both pathological and physiological functions.
A type IV collagen molecule has six alpha chains which can exist in...
A type IV collagen molecule has six alpha chains which can exist in...
Diversity of Antigen Receptors
Antigen receptors are essential components of the immune system crucial in defending the body against foreign invaders. These receptors are present on the surface of B and T cells, enabling them to recognize antigens and mount an appropriate immune response.
Before encountering any antigen, lymphocytes express these receptors. On B cells, the antigen receptor is a membrane-bound antibody molecule called BCR; on T cells, it is a T cell receptor or TCR. B and T cell receptors are composed of two...
Before encountering any antigen, lymphocytes express these receptors. On B cells, the antigen receptor is a membrane-bound antibody molecule called BCR; on T cells, it is a T cell receptor or TCR. B and T cell receptors are composed of two...

