ヒトのタンパク質-DNAインタラクトームのプロファイリングは,ERK2がインターフェロン信号伝達の転写抑制体であることを明らかにする
Shaohui Hu1, Zhi Xie, Akishi Onishi
1Department of Pharmacology and Molecular Sciences, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA.
Cell
|November 3, 2009
まとめ
研究者はヒトのタンパク質とDNAの相互作用 (PDI) をマッピングし,DNAモチーフとタンパク質の間の何千ものつながりを特定しました. この研究は,非従来のDNA結合タンパク質 (uDBPs) を含む新しい相互作用を明らかにし,遺伝子調節に関する理解を広げています.
科学分野:
- ゲノミクスゲノミクスとは
- 分子生物学は分子生物学である.
- バイオインフォマティックス
背景:
- タンパク質-DNA相互作用 (PDIs) は細胞プロセスにとって極めて重要ですが,ゲノムにおける包括的な識別は困難です.
- 配列特異的なPDIを理解することは,遺伝子調節と細胞機能の解読に不可欠です.
研究 の 目的:
- ヒトのタンパク質とDNAの相互作用を体系的に特徴づける.
- 新しい配列特異のPDIを特定し,予期せぬDNA結合タンパク質を発見する.
主な方法:
- タンパク質マイクロアレイベースの戦略によるバイオインフォマティクス分析を組み合わせた.
- ヒトのタンパク質-DNAインタラクトームの体系的なプロファイリング.
主要な成果:
- 460のDNAモチーフと4,191のヒトタンパク質の間で,17718のPDIを特定しました.
- 転写因子 (TFs) の既知のPDIを確認し,既知のTFsと未定のTFsの両方の多数の新規PDIを発見しました.
- RNA結合タンパク質とタンパク質キナーゼを含む300以上の非従来的なDNA結合タンパク質 (uDBPs) が発見され,配列特異的なPDIsを示しています.
- uDBPであるERK2が,転写抑制剤として機能することを実証した.
結論:
- 人間のタンパク質とDNAの相互作用は広範囲で,予期せぬ相互作用が多く含まれています.
- 非伝統的なDNA結合タンパク質は,配列特異のDNA結合と遺伝子調節において重要な役割を果たします.
- この研究は,遺伝子調節を理解し,新しい治療目標の特定に役立つ貴重なリソースを提供します.
関連する概念動画
Eukaryotic Transcription Inhibitors
Certain biochemical processes, such as embryonic development and cell growth regulation, depend on the repression of specific genes. DNA binding proteins known as eukaryotic transcription inhibitors regulate the repression of gene expression in eukaryotes. The presence of these inhibitors at the required location and time in the cell is triggered by the presence of hormones and additional signals from other cells.
Eukaryotic transcription inhibitors usually contain two distinct domains, a DNA...
Eukaryotic transcription inhibitors usually contain two distinct domains, a DNA...
Regulation of the Unfolded Protein Response
Inositol-requiring kinase one or IRE1 is the most conserved eukaryotic unfolded protein response (UPR) receptor. It is a type I transmembrane protein kinase receptor with a distinctive site-specific RNase activity. As the binding mechanics of the misfolded proteins with the N-terminal domain of IRE-1 are unclear, three binding models — direct, indirect, and allosteric -- are proposed for receptor activation. Nevertheless, it is known that once a misfolded protein associates with IRE1, it...
NF-κB-dependent Signaling Pathway
The transcription factor NF-κB was discovered in 1986 in the lab of Nobel laureate Professor David Baltimore, for its interaction with the immunoglobulin light chain enhancer in B-cells. After more than three decades of study, it is now evident that NF-κB regulates the expression of over 100 genes. Most of these genes play an essential role in the innate and adaptive immune responses as well as the inflammatory responses of animals.
NF-κB-dependent Signaling Mechanism
The heterodimer of NF-κB...
NF-κB-dependent Signaling Mechanism
The heterodimer of NF-κB...
RNA Polymerase II Accessory Proteins
Proteins that regulate transcription can do so either via direct contact with RNA Polymerase or through indirect interactions facilitated by adaptors, mediators, histone-modifying proteins, and nucleosome remodelers. Direct interactions to activate transcription is seen in bacteria as well as in some eukaryotic genes. In these cases, upstream activation sequences are adjacent to the promoters, and the activator proteins interact directly with the transcriptional machinery. For example, in...
Master Transcription Regulators
Master transcription regulators are regulatory proteins that are predominantly responsible for regulating the expression of multiple genes. Often these genes work in concert to drive a complex process. Activation of a master transcription regulator can lead to a cascade of transcriptional activation necessary for that outcome. These regulators can directly bind to the regulatory sequences of the various genes involved, or they can indirectly regulate transcription by binding to regulatory...
The Unfolded Protein Response
The ER is the hub of protein synthesis in a cell. It has robust systems to quality control protein folding and also for degradation of terminally misfolded proteins. Under normal conditions, a small proportion of misfolded proteins that cannot be salvaged need to be transported to the cytoplasm by the ER-associated degradation or ERAD pathways. However, if the ERAD cannot handle the misfolded proteins, the cell activates the unfolded protein response or UPR to adjust the protein folding...


