EGF受容体に関連したDNAニッキング活動は,Mr-100,000の解離性タンパク質によるものです
Nature
|August 15, 1985
まとめ
皮膜成長因子受容体 (EGFR) は細胞増殖と関連しています. 研究では,EGFRに関連したDNAニッキング活動が示唆されていますが,この研究は,EGFR自体ではなく,別個の分子実体から生じることを示しています.
科学分野:
- 分子生物学は分子生物学である.
- 細胞シグナリング
- バイオケミストリー バイオケミストリー
背景:
- 表皮成長因子受容体 (EGFR) は,細胞増殖の調節に不可欠なトランスメブランタンパク質です.
- EGFRシグナル伝達には,外向きのEGF結合ドメインと内部チロシンキナーゼドメインが含まれています.
- プラズマ膜から核への信号伝達の正確なメカニズムは不明である.
研究 の 目的:
- エピデルマ・成長因子受容体 (EGFR) と関連したDNAニッキング活動を調査する.
- DNAニッキング活動がEGFRの固有機能であるか,または他の分子と関連しているかどうかを判断する.
主な方法:
- サクラロース・グラディエント遠心分離は,DNA・ニッキング・アクティビティを特徴付けるために使われました.
- 精製されたヒトとマウインのEGF受容体は,以前はATP依存のDNAニッキングを示すと報告されていた.
主要な成果:
- この研究では,表皮成長因子受容体 (EGFR) と関連したDNAニッキング活動を分析した.
- 結果は,DNAニッキング活動はEGFRの固有の特性ではないことを示しています.
- この活動は,EGFRと異なる異なる分子種と関連していることが判明しました.
結論:
- EGFRと関連して観察されたDNAニッキング活動は,受容体自体には固有のものではありません.
- DNAのニッキング機能には,別個の分子実体が責任を負う.
- この発見は,DNAトポロジーを含むEGFR媒介の細胞応答の分子基盤を明確にします.
関連する概念動画
Nucleotide Excision Repair
Overview
Base Excision Repair
One of the common DNA damages is the chemical alteration of single bases by alkylation, oxidation, or deamination. The altered bases cause mispairing and strand breakage during replication. This type of damage causes minimal change to the DNA double helix structure and can be repaired by the base excision repair (BER) pathways. BER corrects damaged DNA sequences by removing the damaged base and restoring the original base sequence using the complementary strand as a template.
The first step of...
The first step of...
Long-patch Base Excision Repair
Since the discovery of the two BER pathways, there has been a debate about how a cell chooses one pathway over the other and the factors determining this selection. Numerous in vitro experiments have pointed out multiple determinants for the sub-pathway selection. These are:
Homologous Recombination
The basic reaction of homologous recombination (HR) involves two chromatids that contain DNA sequences sharing a significant stretch of identity. One of these sequences uses a strand from another as a template to synthesize DNA in an enzyme-catalyzed reaction. The final product is a novel amalgamation of the two substrates. To ensure an accurate recombination of sequences, HR is restricted to the S and G2 phases of the cell cycle. At these stages, the DNA has been replicated already and the...
Nucleotide Excision Repair
DNA Distortion and Damage
Cells are regularly exposed to mutagens—factors in the environment that can damage DNA and generate mutations. UV radiation is one of the most common mutagens and is estimated to introduce a significant number of changes in DNA. These include bends or kinks in the structure, which can block DNA replication or transcription. If these errors are not fixed, the damage can cause mutations, which in turn can result in cancer or disease depending on which sequences are...
Cells are regularly exposed to mutagens—factors in the environment that can damage DNA and generate mutations. UV radiation is one of the most common mutagens and is estimated to introduce a significant number of changes in DNA. These include bends or kinks in the structure, which can block DNA replication or transcription. If these errors are not fixed, the damage can cause mutations, which in turn can result in cancer or disease depending on which sequences are...
Mismatch Repair
Organisms are capable of detecting and fixing nucleotide mismatches that occur during DNA replication. This sophisticated process requires identifying the new strand and replacing the erroneous bases with correct nucleotides. Mismatch repair is coordinated by many proteins in both prokaryotes and eukaryotes.
The Mutator Protein Family Plays a Key Role in DNA Mismatch Repair
The human genome has more than 3 billion base pairs of DNA per cell. Prior to cell division, that vast amount of genetic...
The Mutator Protein Family Plays a Key Role in DNA Mismatch Repair
The human genome has more than 3 billion base pairs of DNA per cell. Prior to cell division, that vast amount of genetic...


