関連する実験動画
Updated: Jul 8, 2026
07:24
A Protocol for the Production of KLRG1 Tetramer
Published on: January 12, 2010
BRCTは,タンパク質ターゲティングに関与するフォスフォペプチド結合モジュールとして繰り返されます
Isaac A Manke1, Drew M Lowery, Anhco Nguyen
1Center for Cancer Research, Department of Biology, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
Science (New York, N.Y.)
|October 25, 2003
まとめ
研究者らは,PTIPとBRCA1のタンデムBRCTドメインを,DNA損傷応答経路の重要なモジュールとして特定した. これらのドメインは,リン酸化基板に結合し,核焦点へのタンパク質の局所化を媒介し,癌の予備性に関する洞察を提供します.
科学分野:
- 分子生物学は分子生物学である.
- セルラー・シグナリング
- がん研究 がん研究
背景:
- DNA損傷反応 (DDR) は,ゲノムの安定性を維持するために極めて重要です.
- タンパク質のリン酸化を含む信号伝達経路は,DDRにおいて重要な役割を果たします.
- 特定の分子相互作用を特定することは,DDRメカニズムを理解する鍵です.
研究 の 目的:
- DDR信号伝達に関与するフォスフォペプチド結合モジュールを特定する.
- リン酸化基板の認識におけるこれらのモジュールの役割を明らかにする.
- DNA修復におけるこれらの相互作用の機能的結果を理解する.
主な方法:
- 部分的に変性したフォスフォペプチドのライブラリを利用したプロテオミックアプローチ.
- フォスホペプチド結合に責任を負うタンパク質ドメインの識別と特徴付け.
- DNA損傷 (ガンマ放射線) に反応するタンパク質の局所化の分析.
主要な成果:
- PTIP (Paxトランザクティベーションドメイン相互作用タンパク質) とBRCA1のタンデムBRCT (BRCA1カルボキシル端末) ドメインは,特定の結合モジュールとして識別されました.
- これらのBRCTドメインは,ATM (ataxia telangiectasia-mutated) とATR (ataxia telangiectasia-and RAD3-related) キナーゼによってリン酸化された基板上のフォスフォセリンまたはフォスフォトレオニン残基を認識する.
- PTIPタンデムBRCTドメインは,DNA損傷のマーカーである53BP1とガンマ-H2AXを含む核焦点へのリン酸化依存の局所化を媒介する.
結論:
- この研究は,DNA損傷応答におけるBRCTドメインの機能の分子基礎を提供する.
- BRCTドメインは,DDRシグナル伝達における重要なフォスフォペプチド結合モジュールとして機能する.
- BRCA1 Met1775ArgのようなBRCTドメインの機能と変異を理解することで,乳がんや卵巣がんへの傾向を説明することができます.
関連する概念動画
02:41Protein Complex Assembly
Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types. Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes.
Many viruses self-assemble into a fully functional unit using the infected host cell to...
Many viruses self-assemble into a fully functional unit using the infected host cell to...
01:57Protein Complexes with Interchangeable Parts
Groups of proteins may form a complex where each protein in this complex has a different role in the overall execution of the complex’s function. Often some of the proteins in the complex can be replaced by a closely related variant to give a complex that contains many of the same components yet is functionally distinct.
The SCF ubiquitin ligase is a protein complex of five individual proteins. This complex attaches ubiquitin to other target proteins to mark them for degradation. In order to...
The SCF ubiquitin ligase is a protein complex of five individual proteins. This complex attaches ubiquitin to other target proteins to mark them for degradation. In order to...
02:41Protein Complex Assembly
Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types. Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes.
Many viruses self-assemble into a fully functional unit using the infected host cell to...
Many viruses self-assemble into a fully functional unit using the infected host cell to...
01:57Protein Complexes with Interchangeable Parts
Groups of proteins may form a complex where each protein in this complex has a different role in the overall execution of the complex’s function. Often some of the proteins in the complex can be replaced by a closely related variant to give a complex that contains many of the same components yet is functionally distinct.
The SCF ubiquitin ligase is a protein complex of five individual proteins. This complex attaches ubiquitin to other target proteins to mark them for degradation. In order to...
The SCF ubiquitin ligase is a protein complex of five individual proteins. This complex attaches ubiquitin to other target proteins to mark them for degradation. In order to...
01:56Structural Protein Function
Structural proteins are a category of proteins responsible for functions ranging from cell shape and movement to providing support to major structures such as bones, cartilage, hair, and muscles. This group includes proteins such as collagen, actin, myosin, and keratin.
Collagen, the most abundant protein in mammals, is found throughout the body. In connective tissue, such as skin, ligaments, and tendons, it provides tensile strength and elasticity. In bones and teeth, it mineralizes to form...
Collagen, the most abundant protein in mammals, is found throughout the body. In connective tissue, such as skin, ligaments, and tendons, it provides tensile strength and elasticity. In bones and teeth, it mineralizes to form...
01:09Multi-pass Transmembrane Proteins and β-barrels
In multi-pass transmembrane proteins, the polypeptide chain crosses the membrane more than once. The transmembrane polypeptide chain either forms an α-helix or β-strand structure. α-Helix containing multi-pass transmembrane proteins are ubiquitous, whereas β-strand containing ones are mainly found in gram-negative bacteria, mitochondria, and chloroplasts.
α-Helix containing multi-pass transmembrane proteins
Multi-pass transmembrane proteins such as G-protein-linked receptors (GPCRs) and...
α-Helix containing multi-pass transmembrane proteins
Multi-pass transmembrane proteins such as G-protein-linked receptors (GPCRs) and...