相关实验视频

Updated: May 9, 2025

Author Spotlight: Unraveling the Dynamics of Eukaryotic DNA Replication Through Single-Molecule Visualization

Author Spotlight: Unraveling the Dynamics of Eukaryotic DNA Replication Through Single-Molecule Visualization

Published on: September 27, 2024

从单个分子的角度来看,hMEIOB和hSPATA22与ssDNA结合的新特性

Yating Xu^1,2, Wei Qu³, Erchi Zhou⁴

¹State Key Laboratory of Metabolism and Regulation in Complex Organisms, Hubei Provincial Key Laboratory of Developmentally Originated Disease, TaiKang Center for Life and Medical Sciences, School of Basic Medical Sciences, Wuhan University, Wuhan 430072, China.

Acta biochimica et biophysica Sinica

|April 29, 2025

概括

人类的MEIOB和SPATA22蛋白在变化过程中结合单链DNA (ssDNA). MEIOB-SPATA22异构体显示出强大的ssDNA结合,对于DNA修复和男性生育是至关重要的.

科学领域:

分子生物学分子生物学
遗传学是一个遗传学.
生殖生物学生殖生物学

背景情况:

MEIOB和SPATA22是生殖腺特异性蛋白质,对于中介性重组至关重要.
在MEIOB和SPATA22中发生的突变与男性不孕症有关,导致寡精或亚精.
已经确定了MEIOB-SPATA22异构体在同源重组过程中识别复制蛋白A (RPA) 涂层单链DNA (ssDNA) 的作用,但存在物种特异性差异.

研究的目的:

在体外研究人类MEIOB (hMEIOB) 和SPATA22 (hSPATA22) 的ssDNA结合模式.
在ssDNA结合的背景下阐明hMEIOB,hSPATA22和人类RPA复合体之间的功能相互作用.
提供单分子视角来了解这些蛋白质在中介性DNA修复中的作用.

主要方法:

重组人类MEIOB (hMEIOB) 和SPATA22 (hSPATA22) 的表达和净化.
电泳运动转移试验 (EMSA) 来评估DNA结合.
磁针 (MT) 和生物层干扰测量 (BLI) 试验分析ssDNA结合动力学,亲和力和稳定性.
在人体RPA复合体的体外结合试验.

主要成果:

hMEIOB独立表现出较低的ssDNA结合亲和力和稳定性.
hSPATA22表现出快速稳定的ssDNA结合,促进ssDNA的凝聚.
该hMEIOB-hSPATA22异构体显示显著增强的ssDNA结合亲和力和稳定性.
观察到多个hMEIOB-hSPATA22异构体在体外聚合.
人类RPA复合物降低了hMEIOB,hSPATA22及其异构体的ssDNA结合亲和力,也可以与hSPATA22和异构体结合.

结论:

这项研究提供了第一次hMEIOB和hSPATA22与ssDNA结合的体外表征.
在化过程中,hMEIOB-hSPATA22异构体对稳定的ssDNA结合至关重要.
这些发现阐明了RPA与MEIOB-SPATA22复合体之间的相互作用,提供了对男性半月变异中DNA损伤修复机制的见解.

关键词:

梅奥比 (MEIOB) 是一个这就是SPATA2222的原因.生物层干扰计.生物层干扰计.这种异构聚合物是异构聚合物.磁性 tweezer 是一个磁性 tweezer 是一个磁性 tweezer.这就是 ssDNADNA.

更多相关视频

Author Spotlight: Investigating the Motion Dynamics of the Eukaryotic Replisome Components at the Single-Molecule Level

Author Spotlight: Investigating the Motion Dynamics of the Eukaryotic Replisome Components at the Single-Molecule Level

Published on: July 26, 2024

Analyzing and Building Nucleic Acid Structures with 3DNA

Analyzing and Building Nucleic Acid Structures with 3DNA

Published on: April 26, 2013

相关概念视频

Single-Strand DNA Binding Proteins

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 Helicases

DNA Helicases

DNA unwinding helicase enzymes are a type of motor protein. Motor proteins can translocate along filaments or polymers using energy generated from ATP hydrolysis. Helicases are involved in all the important cellular processes where DNA unwinding is required, such as DNA replication, repair, recombination, and transcription. They are present in all living organisms, but vary in their structure, function, and mechanism of action. For example, in prokaryotes, DnaB helicase binds and translocates...