キネトプラストDNAネットワークのトポロジー

J Chen¹, C A Rauch, J H White

¹Department of Molecular and Cell Biology, University of California, Berkeley 94720.

Cell

|January 13, 1995

まとめ

トライパノソーム内のキネトプラストDNA (kDNA) のミニサークルは,平均3つの隣人にリンクしています. これはミツバチの巣のような構造を示唆し,寄生虫DNAの組織と機能に影響を与えます.

科学分野:

* 分子生物学 * 分子生物学
* 寄生虫学について
* バイオインフォマティクス

背景:

*トライパノソームのキネトプラストDNA (kDNA) は,数千のミニサークルとマキシサークルで構成されています.
* これらのミニサークルのトポロジカルなリンクは完全に理解されていません.
* kDNAのトポロジーを理解することは,寄生生物学の理解に不可欠です.

研究の目的:

* Crithidia fasciculata kDNAネットワーク内のミニサークルのトポロジカルな配置を決定する.
* グラフ理論を用いてネットワーク構造をモデル化する.
* kDNAトポロジーの組立と機能への影響を明らかにする.

主な方法:

* kDNAネットワーク構造の正確なモデルを作成するためにグラフ理論の適用.
* ランダムなネットワーク断裂モデルに基づくミニサークルオリゴマーの周波数の予測.
*制御された消化後のkDNAネットワークの断片化パターンの分析.
* 理論的予測による実験的な断片化データの比較分析.

主要な成果:

* kDNAネットワークのトポロジカルリンクを最もよく表すモデルが特定されました.
*各ミニサークルは,平均して約3つの他のミニサークルと接続されています.
*この発見は,ミニサークルの巣状の配置を示唆し,それぞれが六角形の細胞の頂点にある.

結論:

*この研究は,トライパノソマチド kDNAの可能なトポロジカル構造を明らかにした.
* 特定されたハネコブの配置は,kDNAの組立と機能に重大な影響を及ぼします.
* この研究は,キネトプラストのDNA組織に関するさらなる調査のための枠組みを提供します.

さらに関連する動画

07:44

Design and Synthesis of a Reconfigurable DNA Accordion Rack

Published on: August 15, 2018

6.7K

09:32

Stable DNA Motifs, 1D and 2D Nanostructures Constructed from Small Circular DNA Molecules

Published on: April 12, 2019

6.2K

関連する概念動画

00:46

Genomic DNA in Prokaryotes

42.4K

The genome of most prokaryotic organisms consists of double-stranded DNA organized into one circular chromosome in a region of cytoplasm called the nucleoid. The chromosome is tightly wound, or supercoiled, for efficient storage. Prokaryotes also contain other circular pieces of DNA called plasmids. These plasmids are smaller than the chromosome and often carry genes that confer adaptive functions, such as antibiotic resistance.
Genomic Diversity in Bacteria
Although bacterial genomes are much...

The DNA Helix

The Replisome

DNA replication is carried out by a large complex of proteins that act in a coordinated matter to achieve high-fidelity DNA replication. Together this complex is known as the DNA replication machinery or the replisome.
The synthesis of the leading and lagging strands is a highly coordinated process. To explain this, the “Trombone model” was proposed by Bruce Alberts in 1980. The DNA loop formation starts when a primer is synthesized on the parent lagging strand. The loop grows with...

31.2K

02:02

DNA Topoisomerases

32.3K

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. ...

32.3K

02:57

Attachment of Sister Chromatids

3.1K

As cells progress into mitosis, the nuclear envelope breaks down, and the condensed chromosomes are exposed to the array of bipolar microtubules of the mitotic spindle. The kinetochore, a large, disc-shaped protein complex, is present at the centromere region of the sister chromatids and acts as a binding site for the microtubules. Usually, the plus-end of a single microtubule is embedded within the kinetochore. However, some kinetochores first establish lateral contact with the side-wall...

3.1K

01:07

The DNA Helix

19.9K

Deoxyribonucleic acid, or DNA, is the genetic material responsible for passing traits from generation to generation in all organisms and most viruses. DNA is composed of two strands of nucleotides that wind around each other to form a spring-like structure called a double helix. However, the double helix is not perfectly symmetrical. Instead, there are regularly occurring grooves in the structure. The major groove occurs where the sugar-phosphate backbones are relatively far apart. This space...