相关实验视频
Updated: Jan 22, 2026

08:51
Genotyping of Staphylococcus aureus by Ribosomal Spacer PCR RS-PCR
Published on: November 4, 2016
10.1K
黄金葡萄球菌 (Staphylococcus aureus RecJ) 的结构和功能表征揭示了CTD介导的DNA修复机制中的功能分歧
Jin Gao1, Yiyang Sun1, Xin Xu1
1Zhejiang Key Laboratory of Medical Epigenetics, Department of Immunology and Pathogen Biology, School of Basic Medical Sciences, Affiliated Hospital of Hangzhou Normal University, Hangzhou Normal University, Hangzhou, China.
Protein science : a publication of the Protein Society
|January 20, 2026
概括
金黄色葡萄球菌 RecJ (SaRecJ) 是一种在压力下起作用的DNA修复酶. 它独特的结构使其能够修复DNA交叉链接,帮助细菌的生存.
科学领域:
- 微生物学 微生物学
- 分子生物学分子生物学
- 生物化学 生物化学
背景情况:
- 金黄色葡萄球菌是一种病原体,由于多药性耐药性,导致临床挑战.
- RecJ核酶对于DNA修复和抗压力至关重要,但它们在S. aureus中的作用尚未完全理解.
研究的目的:
- 从结构和生化学上表征S. aureus RecJ (SaRecJ) 并与Deinococcus radiodurans RecJ (DrRecJ) 进行比较.
- 阐明SaRecJ在DNA修复中的功能专业化,特别是在压力条件下.
主要方法:
- 基于C端域 (CTD) 几何学的细菌RecJ蛋白的分类.
- 结构确定 (X射线晶体) 的SaRecJ.
- 生物化学测试以评估外核酶活性,稳定性和基质特异性.
- 在DNA修复途径中对SaRecJ的功能分析,包括与SaDinG的合作.
主要成果:
- SaRecJ是一种Mg2+依赖的5'-3'外核酶,在高温和高盐条件下活跃.
- 在SaRecJ中具有独特的CTD形状,缺少在DrRecJ中发现的SSB结合口袋.
- SaRecJ的CTD增强了稳定性和ssDNA切除,它特别修复了米托米辛C诱导的DNA交叉链接.
- SaRecJ与SaDinG合作进行DNA末端切除.
结论:
- RecJ 蛋白质表现出由 CTD 变异驱动的功能专业化.
- 黄金杆菌利用一个改造后的DNA修复机制,包括SaRecJ,以在交叉链接压力下保持基因组完整性.
相关概念视频
Mechanical Protein Functions
5.5K
Proteins perform many mechanical functions in a cell. These proteins can be classified into two general categories- proteins that generate mechanical forces and proteins that are subjected to mechanical forces. Proteins providing mechanical support to the structure of the cell, such as keratin, are subjected to mechanical force, whereas proteins involved in cell movement and transport of molecules across cell membranes, such as an ion pump, are examples of generating mechanical force.
5.5K
Overview of DNA Repair
33.5K
In order to be passed through generations, genomic DNA must be undamaged and error-free. However, every day, DNA in a cell undergoes several thousand to a million damaging events by natural causes and external factors. Ionizing radiation such as UV rays, free radicals produced during cellular respiration, and hydrolytic damage from metabolic reactions can alter the structure of DNA. Damages caused include single-base alteration, base dimerization, chain breaks, and cross-linkage.
Chemically...
Chemically...
33.5K
Structural Protein Function
29.8K
Structural proteins are a category of proteins responsible for functions ranging from cell shape and movement to providing support to major structures such as bones, cartilage, hair, and muscles. This group includes proteins such as collagen, actin, myosin, and keratin.
Collagen, the most abundant protein in mammals, is found throughout the body. In connective tissue, such as skin, ligaments, and tendons, it provides tensile strength and elasticity. In bones and teeth, it mineralizes to...
Collagen, the most abundant protein in mammals, is found throughout the body. In connective tissue, such as skin, ligaments, and tendons, it provides tensile strength and elasticity. In bones and teeth, it mineralizes to...
29.8K
Structural Protein Function
3.2K
3.2K
Fruit Development, Structure, and Function
25.0K
Fruits form from a mature flower ovary. As seeds develop from the ovules contained within, the ovary wall undergoes a series of complex changes to form fruit. In some fruits, such as soybeans, the ovary wall dries; in other fruits, such as grapes, it remains fleshy. In some cases, organs other than the ovary contribute to fruit formation; such fruits are called accessory fruits.
25.0K
Mechanical Protein Function
2.5K
2.5K

