纯化和表征本质上有障碍的阿拉比多普西斯塔利亚纳蛋白 SOG1 的特征
Kim Mignon1, Margot Galle2, Rani Van der Eecken1
1Structural Biology Brussels, Vrije Universiteit Brussel, Pleinlaan 2, B-1050, Brussel, Belgium; Center for Structural Biology, VIB, Pleinlaan 2, B-1050, Brussel, Belgium.
Protein expression and purification
|February 1, 2025
概括
研究人员开发了表达和净化植物DNA损伤反应因子SOG1.1的方法. 昆虫和大肠杆菌表达的SOG1蛋白都是功能二元体,昆虫细胞表达产生潜在的活性酸化形式.
科学领域:
- 植物分子生物学 植物分子生物学
- 转录因子研究 转录因子研究
- 对DNA损伤的反应反应
背景情况:
- SOG1 (NAC转录因子) 对于植物DNA损伤反应至关重要.
- 它具有结构化的NAC域和无序的C端域 (CTD).
- 了解SOG1的结构和功能需要可靠的重组蛋白表达.
研究的目的:
- 为了比较不同的表达和净化方法,全长的Arabidopsis thaliana SOG1.1.
- 描述纯化重组蛋白质的生物物理和功能性质.
主要方法:
- 在Sf9昆虫细胞和大肠杆菌BL21 (DE3) 中的重组蛋白表达.
- 使用可切割的SUMO可溶性标签对大肠杆菌表达进行净化.
- 循环二元化 (CD) 光谱和差分扫描热量计 (DSC) 稳定性.
- 用多角度光散射 (SEC-MALS) 进行尺寸排除色谱,用于二分化.
- 分析SEC用于评估蛋白质非球性.
- 电泳运动移位测定 (EMSA) 测定DNA结合活性.
主要成果:
- 昆虫细胞表达产生了潜在的化SOG1 (在T423),可能是活性的.
- 大肠杆菌表达与SUMO标签产生的非酸化,转录无活性的SOG1.1.
- 这两种制剂都在溶液中形成二元体,并且由于失调的CTD而非球状.
- 两种纯化的SOG1蛋白都显示出对SMR5促进体区域的DNA结合活性.
结论:
- 为了Arabidopsis SOG1.1,成功表达和净化方案已经建立.
- 失调的CTD显著影响SOG1的非球状结构.
- 来自昆虫和大肠杆菌的SOG1蛋白都是功能性的,结合目标DNA,验证了它们对进一步研究的有用性.
相关概念视频
Intrinsically Disordered Proteins
Intrinsically disordered proteins are a group of proteins that do not fold into specific three-dimensional structures. Their structural flexibility allows them to complement ordered proteins to perform functions that are inaccessible to rigid structures. They are more common in eukaryotes than prokaryotes and may either be exclusively intrinsically disordered or hybrid proteins, consisting of a mix of ordered and disordered regions. The absence of a rigid structure in these proteins can be...
Intrinsically Disordered Proteins
Intrinsically disordered proteins are a group of proteins that do not fold into specific three-dimensional structures. Their structural flexibility allows them to complement ordered proteins to perform functions that are inaccessible to rigid structures. They are more common in eukaryotes than prokaryotes and may either be exclusively intrinsically disordered or hybrid proteins, consisting of a mix of ordered and disordered regions. The absence of a rigid structure in these proteins can be...


