相关实验视频

Updated: Apr 13, 2026

Analyzing and Building Nucleic Acid Structures with 3DNA

Analyzing and Building Nucleic Acid Structures with 3DNA

Published on: April 26, 2013

在一个更高阶转位中间体内部的柔性DNA复合体的解剖学

B D Lavoie¹, G S Shaw, A Millner

¹Department of Biochemistry, University of Western Ontario, London, Ontario, Canada.

|May 31, 1996

概括

研究人员修改了大肠杆菌HU蛋白来产生HU核酶. 这些酶精确地绘制了HU蛋白的地图.

科学领域:

分子生物学分子生物学
结构生物学结构生物学
生物化学生物化学

背景情况:

大肠杆菌HU是一种非序列特异性的DNA结合蛋白,对DNA组织至关重要.
了解HU在Mu转基因组等复杂结构中的作用,对于DNA复制和转基因转换至关重要.
之前的研究缺乏关于HU在Mu转基因组内的定位和DNA相互作用的精确数据.

研究的目的:

确定在Mu转基因组内HU结合的精确定位,立体测量和方向.
在Mu转基因组中,通过HU结合诱导的DNA曲的特征.
为了生成转子体内HU-DNA相互作用的分子模型.

主要方法:

埃舍里希亚大肠杆菌HU蛋白的化学修饰,以创建具有铁-EDTA裂解部分的16种不同的HU核酶.
分析Mu转基因组内每个HU核酶产生的特定DNA裂变模式.
整合DNA裂变数据与HU的3D结构用于计算分子建模.

主要成果:

特定的DNA裂变模式精确地绘制了Mu转基因组中的HU结合位点,静脉测量和方向.
HU结合会诱导显著的DNA曲,其中心,方向和大小被量化.
这项研究提供了第一个分子模型快照的HU-DNA相互作用在Mu转基因组.

结论:

在复杂的分子机器中,HU-核酶是剖析蛋白质-DNA相互作用的有效工具.
HU结合在Mu转基因组内塑造DNA中起着至关重要的作用,诱导明显的曲.
衍生的HU-DNA相互作用模型为DNA转换的机制提供了新的见解.

更多相关视频

Self-assembly of Complex Two-dimensional Shapes from Single-stranded DNA Tiles

Self-assembly of Complex Two-dimensional Shapes from Single-stranded DNA Tiles

Published on: May 8, 2015

Design and Synthesis of a Reconfigurable DNA Accordion Rack

Design and Synthesis of a Reconfigurable DNA Accordion Rack

Published on: August 15, 2018

相关概念视频

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...

DNA Topoisomerases

DNA Topoisomerases

Topoisomerases are enzymes that relax overwound DNA molecules during various cell processes, including DNA replication and transcription. These enzymes regulate positive and negative DNA supercoiling without changing the nucleotide sequence. DNA overwinding in a clockwise direction results in positively supercoiled DNA, whereas underwinding in a counterclockwise direction produces negatively supercoiled DNA.
Types and Mechanism of action
Topoisomerases are divided into two main types. ...

Overview of Transposition and Recombination

Overview of Transposition and Recombination

Transposons make up a significant part of genomes of various organisms. Therefore, it is believed that transposition played a major evolutionary role in speciation by changing genome sizes and modifying gene expression patterns. For example, in bacteria, transposition can lead to conferring antibiotic resistance. Movement of transposable elements within the genetic pool of pathogenic bacteria can aid in transfer of antibiotic-resistant genetic elements. In eukaryotes, transposons can carry out...

DNA-only Transposons

DNA-only Transposons

DNA-only transposons are called autonomous transposons since they code for the enzyme transposase that is required for the transposition mechanism. Insertion of transposons can alter gene functions in multiple ways. They can mutate the gene, alter gene expression by introducing a novel promoter or insulator sequence, introduce new splice sites, and change the mRNA transcripts produced, or remodel chromatin structure.
The donor site from where the transposon is excised is either degraded or...

LTR Retrotransposons

LTR Retrotransposons

LTR retrotransposons are class I transposable elements with long terminal repeats flanking an internal coding region. These elements are less abundant in mammals compared to other class I transposable elements. About 8 percent of human genomic DNA comprises LTR retrotransposons. Some of the common examples of LTR retrotransposons are Ty elements in yeast and Copia elements in Drosophila.
The internal coding region of LTR retrotransposons and their mechanism of transposition closely resembles a...

Non-LTR Retrotransposons

Non-LTR Retrotransposons

As the name suggests, non-LTR retrotransposons lack the long terminal repeats characteristic of the LTR retrotransposons. Additionally, both LTR and non-LTR retrotransposons use distinct mechanisms of mobilization. Non-LTR retrotransposons are further divided into two classes - Long interspersed nuclear elements (LINEs) and short interspersed nuclear elements (SINEs), both of which occur abundantly in most mammals, including humans. Some of the active non-LTR retrotransposons in humans are L1...