相关实验视频

Updated: May 9, 2025

Author Spotlight: Characterizing DNA G-Quadruplex by Bis-3-Chloropiperidine Based Chemical Mapping

Author Spotlight: Characterizing DNA G-Quadruplex by Bis-3-Chloropiperidine Based Chemical Mapping

Published on: May 12, 2023

一种TATA-box结合蛋白以两种方式结合单链DNA:与多链G通道和灵活的DNA区域

Kieran Freitag¹, Melanie Marlow¹, Joella Joseph¹

¹Biochemistry and Molecular Biology Program, Trent University, Peterborough, ON.

The Journal of biological chemistry

|April 29, 2025

概括

大肠杆菌的TATA盒结合蛋白 (gTBP) 通过两种不同的模式独特地结合单链DNA (ssDNA),为真核转录调节提供了新的见解.

科学领域:

分子生物学分子生物学
生物化学生化学
遗传学是一个遗传学.

背景情况:

塔塔盒结合蛋白 (TBPs) 是真核生物中至关重要的转录因子.
来自Giardia intestinalis (gTBP) 的TBP同源高度分化,缺乏其他TBP中发现的关键功能域.
了解gTBP的DNA结合对于破译Giardia的生物学和真核体转录的独特方面至关重要.

研究的目的:

为了研究Giardia intestinalis TBP同类物 (gTBP) 的DNA结合特性.
描述gTBP与单链DNA (ssDNA) 的非传统结合方式.
探索gTBP对真核细胞转录调节的独特结合的含义.

主要方法:

生物化学分析以确定DNA结合偏好和模式.
对gTBP的DNA结合口袋结构的分析.
设计和合成新的DNA序列以验证结合机制.
蛋白质度和ssDNA序列依赖性研究.

主要成果:

由于DNA结合口袋较窄,gTBP优先结合单链DNA (ssDNA).
gTBP表现出两种不同的结合方式 (A和B),取决于ssDNA序列和蛋白质度.
模式A涉及小聚合物与G丰富的ssDNA结合,而模式B涉及受DNA结构性质影响的单聚合物结合.
设计的DNA序列具有特定的基堆叠能量配置文件,有效地竞争gTBP结合.

结论:

gTBP具有与其他真核细胞TBP不同的非传统ssDNA结合能力.
识别的绑定模式为转录调节机制提供了新的视角.
进一步研究gTBP结合模式可以揭示Giardia的生物学和更广泛的真核转录过程.

关键词:

阿尔法Fold3是什么意思基因结构 DNA结构 DNA结构美国EMSA的EMSA是EMSA.在G-quadruplex中使用.大肠 (Giardia intestinalis) 是一种肠道.转录因子是一种转录因子.基础堆叠能量基础堆叠能量计算机建模计算机建模寄生虫寄生虫是一种寄生虫.蛋白质结合微阵列 (PBM) 是一种蛋白质结合微阵列.原始主义者原始主义者

更多相关视频

Analyzing DNA-Protein Interactions with Streptavidin-Based Biolayer Interferometry

Analyzing DNA-Protein Interactions with Streptavidin-Based Biolayer Interferometry

Published on: January 17, 2025

Determining the Thermodynamic and Kinetic Association of a DNA Aptamer and Tetracycline Using Isothermal Titration Calorimetry

Determining the Thermodynamic and Kinetic Association of a DNA Aptamer and Tetracycline Using Isothermal Titration Calorimetry

Published on: August 23, 2022

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...

Cooperative Binding of Transcription Regulators

Cooperative Binding of Transcription Regulators

Transcriptional regulators bind to specific cis-regulatory sequences in the DNA to regulate gene transcription. These cis-regulatory sequences are very short, usually less than ten nucleotide pairs in length. The short length means that there is a high probability of the exact same sequence randomly occurring throughout the genome. Since regulators can also bind to groups of similar sequences, this further increases the chances of random binding. Transcriptional regulators form...

Bacterial Transcription

Bacterial Transcription

RNA polymerase (RNAP) carries out DNA-dependent RNA synthesis in both bacteria and eukaryotes. Bacteria do not have a membrane-bound nucleus. So, transcription and translation occur simultaneously, on the same DNA template.
Transcription can be divided into three main stages, each involving distinct DNA sequences to guide the polymerase. These are:

Transcription Initiation

Transcription Initiation

Initiation is the first step of transcription in eukaryotes. Prokaryotic RNA Polymerase (RNAP) can bind to the template DNA and start transcribing. On the other hand, transcription in eukaryotes requires additional proteins, called transcription factors, to first bind to the promoter region in the DNA template. This binding helps recruit the specific RNAP that can assemble on the DNA and start transcription.
The promoters and enhancers and their accessory proteins allow tight regulation of...

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...

The Eukaryotic Promoter Region

The Eukaryotic Promoter Region

The eukaryotic promoter region is a segment of DNA located upstream of a gene. It contains an RNA polymerase binding site, a transcription start site, and several cis-regulatory sequences. The proximal promoter region is located in the vicinity of the gene and has cis-regulatory sequences and the core promoter. The core promoter is the binding site for RNA polymerase and is usually located between -35 and +35 nucleotides from the transcription start site. The distal promoter regions are...