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相关概念视频

Ligand Binding and Linkage00:49

Ligand Binding and Linkage

Allosteric proteins have more than one ligand binding site; the binding of a ligand to any of these sites influences the binding of ligands to the other sites. When a protein is allosteric, its binding sites are called coupled or linked.  In the case of enzymes, the site that binds to the substrate is known as the active site and the other site is known as the regulatory site. When a ligand binds to the regulatory site, this leads to conformational changes in the protein that can influence the...
DNA as a Genetic Template02:05

DNA as a Genetic Template

Two structural features of the DNA molecule provide a basis for the mechanisms of heredity: the four nucleotide bases and its double-stranded nature. The Watson-Crick model of double-helical DNA structure, proposed in 1952, drew heavily upon the X-ray crystallography work of researchers Rosalind Franklin and Maurice Wilkins. Watson, Crick, and Wilkins jointly received the Nobel Prize in Physiology or Medicine for their work in 1962. Franklin was, controversially, excluded from the prize for...
Translesion DNA Polymerases02:10

Translesion DNA Polymerases

Translesion (TLS) polymerases rescue stalled DNA polymerases at sites of damaged bases by replacing the replicative polymerase and installing a nucleotide across the damaged site. Doing so, TLS allows additional time for the cell to repair the damage before resuming regular DNA replication.
TLS polymerases are found in all three domains of life - archaea, bacteria, and eukaryotes. Of the different classes of TLS polymerases, members of the Y family are fitted with specialized structures that...
Single-Strand DNA Binding Proteins01:03

Single-Strand DNA Binding Proteins

For successful DNA replication, the unwinding of double-stranded DNA must be accompanied by stabilization and protection of the separated single strands of the DNA. This crucial task is performed by single-strand DNA-binding (SSB) proteins. They bind to the DNA in a sequence-independent manner, which means that the nitrogenous bases of the DNA need not be present in a specific order for binding of SSB proteins to it. The binding of SSB proteins straightens single-stranded DNA (ssDNA) and makes...
DNA as a Genetic Template02:05

DNA as a Genetic Template

Two structural features of the DNA molecule provide a basis for the mechanisms of heredity: the four nucleotide bases and its double-stranded nature. The Watson-Crick model of double-helical DNA structure, proposed in 1952, drew heavily upon the X-ray crystallography work of researchers Rosalind Franklin and Maurice Wilkins. Watson, Crick, and Wilkins jointly received the Nobel Prize in Physiology or Medicine for their work in 1962. Franklin was, controversially, excluded from the prize for...
Mechanism of Conjugation01:19

Mechanism of Conjugation

Bacterial conjugation is a mechanism of horizontal gene transfer that enables the exchange of genetic material between bacterial cells through direct contact. This process is facilitated by a donor cell carrying a conjugative plasmid, which encodes genes necessary for pilus formation, DNA replication, and transfer. The conjugative plasmid plays a central role in initiating and executing the transfer of genetic material.The tra region of the conjugative plasmid encodes proteins responsible for...

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相关实验视频

Updated: Jul 7, 2026

Tools to Study the Role of Architectural Protein HMGB1 in the Processing of Helix Distorting, Site-specific DNA Interstrand Crosslinks
12:19

Tools to Study the Role of Architectural Protein HMGB1 in the Processing of Helix Distorting, Site-specific DNA Interstrand Crosslinks

Published on: November 10, 2016

显著依赖于载体-连接体散量,但不依赖于载体-连接体二重复与单链形式的DNA寡核酸与一系列G-Pt (II) -G内链交叉链接建模的G-Pt (II) -G内链交叉链接模拟cisplatin-DNA引证的载体-连接体奇拉性.

Vladimir Beljanski1, Julie M Villanueva, Paul W Doetsch

  • 1Department of Chemistry, Emory University, Atlanta, Georgia 30322, USA.

Journal of the American Chemical Society
|November 10, 2005
PubMed
概括

-DNA交叉链接是西斯的关键.

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Tools to Study the Role of Architectural Protein HMGB1 in the Processing of Helix Distorting, Site-specific DNA Interstrand Crosslinks
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科学领域:

  • 药用化学 医学化学
  • 分子生物学分子生物学
  • DNA损伤和修复的过程

背景情况:

  • 西斯的抗癌疗效依赖于N7-Pt-N7相邻的G,G内链DNA交叉链接.
  • 众所周知,这些-DNA附加物会破坏DNA复合体的稳定,促进链分离.

研究的目的:

  • 为了研究复合体中二胺联体 (L) 的硬质量和性如何影响DNA交叉链接和双重稳定性.
  • 了解-G,G附的结构构成及其对DNA完整性的影响.

主要方法:

  • (II) 复合物的合成和特征与各种不对称的二胺联体.
  • 用复合体处理含有G,G的DNA寡合体复合体.
  • 使用凝电泳分析分析DNA结构变化 (双重转换为单链转换).
  • 酵素消化和HPLC/质谱测量以确定-DNA附加物的构成.

主要成果:

  • 复合物与重的初级二胺 (碳基) 模仿了,导致完全的双重转换为单链转换.
  • 复合物与重的二次二胺 (在上,例如,Bip) 意外形成了稳定的双重复合物,具有两个金丝.
  • 在稳定的BipPt-G3双重体中证实了G,G adduct的头对头 (HH) 形状.
  • 体质量,特别是体质量,显著影响了体稳定性和DNA结构,而体质量的影响很小.

结论:

  • 复合体中的二胺联体的固体质量极大地调节了DNA adduct的形成和稳定性.
  • 大量的结胺稳定双重DNA,防止局部化,与西斯的机制形成鲜明对比.
  • 这些发现凸显了连接体设计在开发具有改变DNA相互作用概况的基抗癌药物的重要性.