SAPKによる複製と転写の調整された制御は,ゲノムの完全性を保護します
Alba Duch1, Irene Felipe-Abrio, Sonia Barroso
1Cell Signaling Unit, Departament de Ciències Experimentals i de la Salut, Universitat Pompeu Fabra, Barcelona E-08003, Spain.
Nature
|November 27, 2012
まとめ
ストレスで活性化されたタンパク質キナーゼHog1は,Mrc1.1をリン酸化することによって,オスモストレスの間にDNA複製と転写を調整します. これにより,これらのプロセス間の衝突を避けるため,ゲノムの不安定性を防ぐことができます.
科学分野:
- 細胞生物学 細胞生物学
- 分子生物学は分子生物学である.
- 遺伝学 遺伝学とは
背景:
- 細胞は,環境ストレス中の遺伝子発現の変化を管理しなければならない.
- 転写と複製の調整は,DNAの損傷と再結合を防ぐために不可欠です.
- ストレス活性化タンパク質キナーゼHog1 (SAPK Hog1) は,S相においてストレス反応性遺伝子を誘発する.
研究 の 目的:
- オスモストレスの間にSaccharomyces cerevisiaeがDNA複製と転写をどのように調整するかを調査する.
- Hog1とMrc1がストレス下にある細胞のプロセスを管理する役割を解明する.
主な方法:
- Hog1.1によるMrc1の相互作用とリン酸化を調査した.
- Mrc1のリン酸化が複製の起源,発火,進行に及ぼす影響を分析した.
- 機能的影響を評価するために,特定の変異 (mrc1(3A)) を有するSaccharomyces cerevisiae菌株を使用しました.
主要な成果:
- Hog1は,DNA損傷経路 (Mec1, Rad53) に独立して,異なる部位でMrc1をリン酸化する.
- Hog1媒介によるMrc1リン酸化は,複製原発発を遅らせ,複製複合体の進行を遅らせます.
- 非リン酸化可能なMrc1 (mrc1(3A)) の細胞は,転写関連再結合とゲノム不安定性の増加を示しています.
結論:
- Hog1とMrc1は,DNAダメージチェックポイントとは別に新しいS相チェックポイントを確立します.
- このHog1-Mrc1経路は,細胞がオスモストレスの間にDNA複製と転写の間の衝突を防ぐことを可能にします.
- この発見は,真核細胞におけるゲノム安定性の維持に不可欠なメカニズムを強調しています.
関連する概念動画
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.
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.
The DNA Replication Fork
An organism’s genome needs to be duplicated in an efficient and error-free manner for its growth and survival. The replication fork is a Y-shaped active region where two strands of DNA are separated and replicated continuously. The coupling of DNA unzipping and complementary strand synthesis is a characteristic feature of a replication fork. Organisms with small circular DNA, such as E. coli, often have a single origin of replication; therefore, they have only two replication forks, one in...
The DNA Replication Fork
An organism’s genome needs to be duplicated in an efficient and error-free manner for its growth and survival. The replication fork is a Y-shaped active region where two strands of DNA are separated and replicated continuously. The coupling of DNA unzipping and complementary strand synthesis is a characteristic feature of a replication fork. Organisms with small circular DNA, such as E. coli, often have a single origin of replication; therefore, they have only two replication forks, one in...
DNA Damage can Stall the Cell Cycle
In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...
DNA Damage Can Stall the Cell Cycle
In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...

