高流動性のグループボックス1 (HMGB1) のO-GlcNAcylationは,DNA結合およびDNA損傷処理活動を変化させる
Aaron T Balana, Anirban Mukherjee1, Harsh Nagpal2
1Division of Pharmacology and Toxicology, College of Pharmacy, The University of Texas at Austin, Dell Pediatric Research Institute, 1400 Barbara Jordan Boulevard, Austin, Texas 78723, United States.
Journal of the American Chemical Society
|September 21, 2021
まとめ
タンパク質O-GlcNAcylationはHMGB1を改変し,DNA結合および修復機能に影響を与える. この糖変異は,損傷したDNAのHMGB1オリゴメリゼーションを強化し,DNA修復を阻害し,O- GlcNAcを癌変異と結びつける可能性があります.
科学分野:
- 生物化学
- 分子生物学
- 細胞生物学
背景:
- タンパク質O-GlcNAcylationは,DNA複製と修復を含む細胞プロセスを調節する重要な翻訳後の修正である.
- 核タンパク質HMGB1 (High Mobility Group Box 1) はO-GlcNAcylatedであることが知られており,DNA損傷反応における役割を示唆している.
研究 の 目的:
- O-GlcNAcylationがHMGB1に及ぼす機能的影響を調査する.
- 特定の部位でのO-GlcNAcの改変が,HMGB1が損傷したDNAと相互作用し,DNA修復におけるその役割をどのように影響するかを決定する.
主な方法:
- O-GlcNAc改変されたHMGB1のサイト固有の合成
- 改変されたHMGB1のDNA結合活性を評価する生化学的測定法
- DNA修復促進におけるHMGB1の役割を評価するための細胞フリー抽出実験.
主要な成果:
- HMGB1の内生O-GlcNAcylationはS100とS107で確認され,S100は主要なサイトでした.
- O-GlcNAcのS100での改変は,様々な形態の損傷したDNAへのHMGB1の結合を変化させ,一般的にその小分子化を増大させた.
- O-GlcNAcの改変は,HMGB1のDNA修復を促進する能力を低下させ,誤りやすいDNA処理につながった.
結論:
- O-GlcNAcylationは,HMGB1のDNA結合特性とDNA修復機能に大きく影響する.
- O- GlcNAcによるHMGB1機能の変化は,O- GlcNAc濃度が高い特定の癌で観察された変異率の増加に寄与する可能性があります.
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