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相关概念视频

Mismatch Repair01:36

Mismatch Repair

Overview
Mutations01:39

Mutations

Overview
Mismatch Repair01:36

Mismatch Repair

Overview
Mutations01:35

Mutations

Mutations are changes in the sequence of DNA. These changes can occur spontaneously or they can be induced by exposure to environmental factors. Mutations can be characterized in a number of different ways: whether and how they alter the amino acid sequence of the protein, whether they occur over a small or large area of DNA, and whether they occur in somatic cells or germline cells.
Chromosomal Alterations Are Large-Scale Mutations
While point mutations are changes in a single nucleotide in...
Mismatch Repair01:20

Mismatch Repair

Organisms are capable of detecting and fixing nucleotide mismatches that occur during DNA replication. This sophisticated process requires identifying the new strand and replacing the erroneous bases with correct nucleotides. Mismatch repair is coordinated by many proteins in both prokaryotes and eukaryotes.
The Mutator Protein Family Plays a Key Role in DNA Mismatch Repair
The human genome has more than 3 billion base pairs of DNA per cell. Prior to cell division, that vast amount of genetic...
Spontaneous and Induced Mutations01:30

Spontaneous and Induced Mutations

Spontaneous mutations arise infrequently during DNA replication due to errors in the process. A key factor behind these errors is tautomeric shifts in nitrogenous bases, where bases transition from keto to enol forms or amino to imino forms. This shift can alter base-pairing rules, leading to mutations. Additionally, reactive oxygen species (ROS) arising from aerobic metabolism can damage DNA, resulting in depurination (loss of a purine base) or depyrimidination (loss of a pyrimidine base).

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相关实验视频

Updated: Jul 6, 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

MutT蛋白特异性地化一种强大的突变基质,用于DNA合成.

H Maki1, M Sekiguchi

  • 1Department of Biochemistry, Faculty of Medicine, Kyushu University, Fukuoka, Japan.

Nature
|January 16, 1992
PubMed
概括
此摘要是机器生成的。

MutT蛋白通过降解氧化瓜核酸的8-oxodGTP来防止DNA复制错误. 这一发现揭示了一种新的机制,它对于保持DNA合成的保真性和防止突变至关重要.

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A Novel Saturation Mutagenesis Approach: Single Step Characterization of Regulatory Protein Binding Sites in RNA Using Phosphorothioates
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A Novel Saturation Mutagenesis Approach: Single Step Characterization of Regulatory Protein Binding Sites in RNA Using Phosphorothioates

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Following the Dynamics of Structural Variants in Experimentally Evolved Populations
04:52

Following the Dynamics of Structural Variants in Experimentally Evolved Populations

Published on: February 3, 2023

相关实验视频

Last Updated: Jul 6, 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

A Novel Saturation Mutagenesis Approach: Single Step Characterization of Regulatory Protein Binding Sites in RNA Using Phosphorothioates
11:49

A Novel Saturation Mutagenesis Approach: Single Step Characterization of Regulatory Protein Binding Sites in RNA Using Phosphorothioates

Published on: August 21, 2018

Following the Dynamics of Structural Variants in Experimentally Evolved Populations
04:52

Following the Dynamics of Structural Variants in Experimentally Evolved Populations

Published on: February 3, 2023

科学领域:

  • 分子生物学分子生物学
  • 遗传学 是一个遗传学.
  • 生物化学 生物化学

背景情况:

  • DNA复制错误是自发突变的主要原因.
  • 存在细胞机制来纠正这些错误,保持低突变率.
  • 对DNA前体的氧化损伤可以导致突变.

研究的目的:

  • 确定防止DNA复制错误的新机制.
  • 研究mutT基因在预防突变中的作用.
  • 了解氧化核酸如何影响DNA合成的真实性.

主要方法:

  • 研究了大肠杆菌mutT基因及其编码的蛋白质.
  • 研究了致变基质8-oxo-7,8-dihydro-2'-dGTP (8-oxodGTP) 的研究.
  • 测定了MutT蛋白在8-oxodGTP上的酶活性.

主要成果:

  • 突变T基因的突变显著增加AT到CG转换 (100-10,000倍).
  • MutT蛋白特异地将8-oxodGTP降解为其单酸盐形式.
  • 在DNA合成过程中,8-oxodGTP被有效地插入模板dA和dC残留物对面.

结论:

  • MutT蛋白提供了一种新的避免错误的机制,通过消除致变性8-oxodGTP.
  • 从池中氧化瓜核酸的降解对于高保真性DNA合成至关重要.
  • 这一途径对于防止由氧化损伤引起的自发突变至关重要.