ユーカリオットの起源に依存するDNA複製は,DDKとS-CDKキナーゼの連続的な作用を in vitroで明らかにしています
Ryan C Heller1, Sukhyun Kang, Wendy M Lam
1Howard Hughes Medical Institute, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA.
Cell
|July 7, 2011
まとめ
ユカリオットDNAの複製には正確なタイミングが必要です. Dbf4依存Cdc7キナーゼ (DDK) は,S相サイクリン依存キナーゼ (S-CDK) よりも前に原点徴募を開始し,その後レプリソーム組立とDNA合成を可能にします.
科学分野:
- 分子生物学は分子生物学である.
- 細胞生物学 細胞生物学
- 遺伝学 遺伝学とは
背景:
- ユカリオットDNAの複製は複雑なプロセスです.
- ヘリコースの負荷,活性化,およびレプリソームの組み立ての時間的な分離は極めて重要です.
- 複製開始の調節を理解することは,細胞サイクル制御の鍵です.
研究 の 目的:
- ユカリオットDNA複製の開始の制御メカニズムを調査する.
- 複製におけるDbf4依存Cdc7キナーゼ (DDK) とS相サイクリン依存キナーゼ (S-CDK) の異なる役割を解明する.
- オリジンの発射とリプリソームの組み立ての間の一連の出来事を定義する.
主な方法:
- ユカリオット起源に依存する複製の開始のための in vitro 測定を用いた.
- 複製のダイナミクスを観察するために,in vivo研究を行いました.
- Sld3,Cdc45,GINS,DNAポリメラーゼなどの重要なタンパク質の採用を調査した.
主要な成果:
- S-CDKではなくDDKが,ヘリケイズ負荷後のSld3とCdc45の初期発生徴募に必要である.
- In vivoでは,DDKは,S-CDKの活性化前にCdc45の早期発射起源の徴募を駆動する.
- S-CDKの活性化により,GINSと残りのレプリソームの採用が容易になります.
- 遅れた鎖のDNAポリメラーゼの募集は,先導鎖の募集とは異なり,Mcm10とDNAの解き放たれに依存しています.
結論:
- DDKとS-CDKは,ヘリカーゼの活性化とレプリソームの組み立てを調節する上で,それぞれ異なる,連続的な役割を担っています.
- リードストランドDNAポリメラーゼが,原始DNA解離とRNAプライマー合成の前に採用されるモデルがサポートされています.
- この研究は,正確なDNA複製の開始に不可欠な出来事の時間的な順序を明確にします.
関連する概念動画
Replication in Eukaryotes
Overview
Replication in Eukaryotes
Overview
S-Cdk Initiates DNA Replication
The cell cycle is a series of events leading to DNA duplication followed by the division of cell content to form two daughter cells. The cell cycle progresses in four stages—the cell increases in size (gap 1 or G1-phase), duplicates its DNA (synthesis or S-phase), prepares to divide (gap 2 or G2-phase), and divides (mitosis or M-phase).
Two states at the origin of replication
In eukaryotes, the initiation of replication occurs at many sites on the chromosomes, called the origins of replication.
Two states at the origin of replication
In eukaryotes, the initiation of replication occurs at many sites on the chromosomes, called the origins of replication.
Replication in Eukaryotes
In eukaryotic cells, DNA replication is highly conserved and tightly regulated. Multiple linear chromosomes must be duplicated with high fidelity before cell division, so there are many proteins that fulfill specialized roles in the replication process. Replication occurs in three phases: initiation, elongation, and termination, and ends with two complete sets of chromosomes in the nucleus.
Many Proteins Orchestrate Replication at the Origin
Eukaryotic replication follows many of the same...
Many Proteins Orchestrate Replication at the Origin
Eukaryotic replication follows many of the same...
S-Cdk Initiates DNA Replication
The cell cycle is a series of events leading to DNA duplication followed by the division of cell content to form two daughter cells. The cell cycle progresses in four stages—the cell increases in size (gap 1 or G1-phase), duplicates its DNA (synthesis or S-phase), prepares to divide (gap 2 or G2-phase), and divides (mitosis or M-phase).
Two states at the origin of replication
In eukaryotes, the initiation of replication occurs at many sites on the chromosomes, called the origins of replication.
Two states at the origin of replication
In eukaryotes, the initiation of replication occurs at many sites on the chromosomes, called the origins of replication.
Replication in Eukaryotes
In eukaryotic cells, DNA replication is highly conserved and tightly regulated. Multiple linear chromosomes must be duplicated with high fidelity before cell division, so there are many proteins that fulfill specialized roles in the replication process. Replication occurs in three phases: initiation, elongation, and termination, and ends with two complete sets of chromosomes in the nucleus.
Many Proteins Orchestrate Replication at the Origin
Eukaryotic replication follows many of the same...
Many Proteins Orchestrate Replication at the Origin
Eukaryotic replication follows many of the same...


