与α-KGDH复合体相结合的KAT2A作为素H3转移酶
Yugang Wang1, Yusong R Guo2, Ke Liu3
1Brain Tumor Center, Department of Neuro-Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas 77030, USA.
Nature
|December 7, 2017
概括
核α-甲酸脱酶 (α-KGDH) 复合物和氨酸转移酶2A (KAT2A) 介导着基因素化. 这种修饰调节基因表达,影响瘤细胞的增殖和生长.
科学领域:
- 生物化学
- 分子生物学
- 表观遗传学
背景情况:
- 基因组的修饰,包括 lysine 化,对于染色体的调节至关重要.
- 精确的机制和功能性作用仍然在很大程度上未被阐明.
研究的目的:
- 为了研究基因素化机制.
- 确定基因调节和细胞增殖中的基因化功能的后果.
主要方法:
- 在人类细胞系中对α- 甲酸脱酶 (α- KGDH) 复合物的局部化研究.
- 同免疫沉测试以确定α-KGDH的结合伙伴.
- 酸乙转移酶2A (KAT2A) 与酸酶A (succinyl-CoA) 复合体中的晶体结构的确定.
- 检测KAT2A功能的位点定向突变发生.
- 在对α-KGDH或KAT2A活性进行操纵后对基因表达和瘤细胞增殖的分析.
主要成果:
- 该α-KGDH复合物定位在核中,并在基因促进区与KAT2A相互作用.
- 晶体结构显示甲酸与KAT2A的结合,其特定的相互作用由氨酸645介导.
- KAT2A作为基转移酶,主要在转录起点附近修改基素H3.
- 抑制核α-KGDH或突变KAT2A的表达会减少基因表达,并影响瘤细胞的增殖和生长.
结论:
- 核α-KGDH复合物产生甲酸,由KAT2A作为甲酸转移酶使用.
- 这一途径对于基因化,基因表达调节和瘤发育至关重要.
- 针对这种机制为癌症提供了潜在的治疗策略.
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