Adenovirus small e1aは,ヒストンの改変の世界的なパターンを変化させる
Gregory A Horwitz1, Kangling Zhang, Matthew A McBrian
1Molecular Biology Institute, University of California, Los Angeles, CA 90095, USA.
まとめ
アデノウイルスのe1aタンパク質は,ヒストンH3ライシン18アセチル化 (H3K18ac) を減少させることで,細胞サイクル進行とリンクしています. この発見は,H3K18のハイポアセチル化が癌の発症における役割を示唆しています.
科学分野:
- 分子生物学は分子生物学である.
- 細胞生物学 細胞生物学
- 腫瘍学 腫瘍学
背景:
- アデノウイルスe1aタンパク質は,RBタンパク質とヒストンアセチルトランスファーゼp300/CBPとの相互作用により,細胞サイクル進行を誘導する.
- e1aがp300/CBPに結合して細胞サイクル進行を促進する正確なメカニズムは,まだ完全に理解されていません.
研究 の 目的:
- 細胞サイクル通過を促進するp300とCBPとのe1aの相互作用の役割を明らかにする.
- ヒストンアセチル化に対するe1aの影響,特にヒストンH3ライシン18 (H3K18) の影響を調査する.
主な方法:
- アデノウイルスe1aタンパク質,RBファミリータンパク質,ヒストンアセチルトランスファーゼp300/CBPとの相互作用を調査した.
- 定量化されたグローバルヒストンH3ライシン18アセチル化 (H3K18ac) レベル.
- CBPとp300のノックダウンを使用して,H3K18ac.におけるそれらの役割を評価しました.
- SV40 T抗原を発現する細胞と前立腺がん組織におけるH3K18acのレベルを検査した.
主要な成果:
- p300/CBPとのe1aの相互作用により,世界的なH3K18ac.が3倍に減少しました.
- CBPとp300のノックダウンはH3K18の低酸化を特異的に引き起こし,H3K18のアセチル化におけるそれらの役割を確認した.
- SV40 T抗原はまた,H3K18の低乙化も誘導した.
- グローバルH3K18低酸化は,予後不良に関連した前立腺がんで観察されました.
結論:
- アデノウイルスのe1aタンパク質は,少なくとも部分的には,H3K18アセチレーションを減少させることで,細胞サイクル進行を促進します.
- グローバルH3K18ヒポアセチル化は,腫瘍性変異に関連した潜在的なメカニズムであり,攻撃的ながんのバイオマーカーとして機能する可能性があります.
関連する概念動画
Histone Modification
The histone proteins have a flexible N-terminal tail extending out from the nucleosome. These histone tails are often subjected to post-translational modifications such as acetylation, methylation, phosphorylation, and ubiquitination. Particular combinations of these modifications form “histone codes” that influence the chromatin folding and tissue-specific gene expression.
Acetylation
The enzyme histone acetyltransferase adds acetyl group to the histones. Another enzyme, histone deacetylase,...
Acetylation
The enzyme histone acetyltransferase adds acetyl group to the histones. Another enzyme, histone deacetylase,...
Histone Modification
The histone proteins have a flexible N-terminal tail extending out from the nucleosome. These histone tails are often subjected to post-translational modifications such as acetylation, methylation, phosphorylation, and ubiquitination. Particular combinations of these modifications form “histone codes” that influence the chromatin folding and tissue-specific gene expression.
Acetylation
The enzyme histone acetyltransferase adds acetyl group to the histones. Another enzyme, histone deacetylase,...
Acetylation
The enzyme histone acetyltransferase adds acetyl group to the histones. Another enzyme, histone deacetylase,...
Histone Variants at the Centromere
Histone variants are the histone proteins with structural and sequence variations. These variants may be regarded as “mutant” forms that replace their canonical histone counterparts in the nucleosomes. Specific post-translational modifications on the histone variants enable further chromatin complexity and regulate tissue-specific gene expression. The most common histone variants are from histone H2A, H2B, and linker histone H1 families. However, several variants of histone H3 variants are also...
Spreading of Chromatin Modifications
The histone proteins in the nucleosomes are post-translationally modified (PTM) to increase or decrease access to DNA. The commonly observed PTMs are methylation, acetylation, phosphorylation, and ubiquitination of lysine amino acids in the histone H3 tail region. These histone modifications have specific meaning for the cell. Hence, they are called "histone code". The protein complex involved in histone modification is termed as "reader-writer" complex.
Writers
The writer is an enzyme that can...
Writers
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Nucleosome Remodeling
Nucleosomes are the basic units of chromatin compaction. Each nucleosome consists of the DNA bound tightly around a histone core, which makes the DNA inaccessible to DNA binding proteins such as DNA polymerase and RNA polymerase. Hence, the fundamental problem is to ensure access to DNA when appropriate, despite the compact and protective chromatin structure.
Nucleosome remodeling complex
Eukaryotic cells have specialized enzymes called ATP-dependent nucleosome remodeling enzymes. These enzymes...
Nucleosome remodeling complex
Eukaryotic cells have specialized enzymes called ATP-dependent nucleosome remodeling enzymes. These enzymes...
The Nucleosome Core Particle
Nucleosomes are the DNA-histone complex, where the DNA strand is wound around the histone core. The histone core is an octamer containing two copies of H2A, H2B, H3, and H4 histone proteins.
Nucleosomes, paradoxically, perform two opposite functions simultaneously. On the one hand, their primary aim is to protect the delicate DNA strands from physical damage and help achieve a higher compaction ratio. On the other hand, they must allow polymerase enzymes to access histone-bound DNA during...
Nucleosomes, paradoxically, perform two opposite functions simultaneously. On the one hand, their primary aim is to protect the delicate DNA strands from physical damage and help achieve a higher compaction ratio. On the other hand, they must allow polymerase enzymes to access histone-bound DNA during...


