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糖系转移酶sxc/Ogt在多抑制中的重要作用
Maria Cristina Gambetta1, Katarzyna Oktaba, Jürg Müller
1Gene Expression Programme, European Molecular Biology Laboratory (EMBL), Meyerhofstrasse 1, 69117 Heidelberg, Germany.
概括
德洛索菲拉基因超性 (sxc) 编码了与O相关的N-乙糖胺 (O-GlcNAc) 转移酶 (Ogt). O-GlcNAc的修饰对于Polycomb组蛋白质在发育过程中保持转录抑制至关重要.
科学领域:
- 发育生物学 发展生物学
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
- 分子生物学分子生物学
背景情况:
- 多组 (PcG) 蛋白质是必不可少的保存转录抑制剂.
- PcG蛋白调节对动物和植物发育至关重要的基因表达.
研究的目的:
- 为了确定Drosophila基因的分子功能,超级性别 (sxc).
- 调查Sxc/Ogt在Polycomb组中介的转录抑制中的作用.
主要方法:
- 在Drosophila中进行全基因组分析,以识别GlcNAc修饰的蛋白质.
- 对sxc/Ogt-null突变的分析,以评估对Polycomb抑制的影响.
- 在活体中对Polycomb组蛋白质进行糖化分析.
主要成果:
- 德洛索菲拉sxc基因编码O-GlcNAc转移酶 (Ogt).
- GlcNAc修饰的蛋白质在Polycomb反应元素中得到丰富.
- 多种类型的蛋白质是通过Sxc/Ogt.糖化.
- sxc/Ogt-null突变体表现出O结合的GlcNAcylation的丧失,并且无法保持PcG抑制.
- PcG 蛋白质复合体在突变分子中结合了目标部位,但抑制失去了.
结论:
- 通过Sxc/Ogt介导的Polyhomeotic的糖化对Drosophila中的Polycomb抑制至关重要.
- O-GlcNAcylation是PcG介导的发育控制的一个关键调节机制.
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