在PKA和PIAS3之间的交叉调节心脏Kv4通道SUMOylation
Leslie-Anne R Jansen1, Meghyn A Welch1,2, Leigh D Plant3
1Department of Biology, Georgia State University, Atlanta, GA, USA.
Cell communication and signaling : CCS
|September 2, 2024
概括
蛋白质SUMOylation调节了离子通道的功能. 这项研究确定PIAS3是Kv4.2和HCN2通道的SUMO E3结合酶,控制它们的表面表达和对PKA酸化的反应.
科学领域:
- 分子生物学分子生物学
- 细胞生理学 细胞生理学
- 神经科学是一个神经科学.
背景情况:
- SUMOylation对于细胞平衡和对刺激的反应至关重要.
- 在易刺激的细胞中,SUMOylation调节离子通道特性和运输.
- 许多离子通道SUMOylation路径的E3连接酶仍然未被确定.
研究的目的:
- 为了确定负责Kv4.2和HCN2通道SUMOylation的SUMO E3结合酶.
- 调查PIAS3在离子通道SUMOylation和贩运中的作用.
- 阐明PKA酸化和SUMOylation在调节Kv4通道功能的相互作用.
主要方法:
- HEK细胞和心肌细胞培养.
- 免疫沉和西部涂抹以检测SUMOylation.
- 位点定向突变发生,以分析酸化和SUMOylation位点.
- 补丁电生理学测量离子通道电流.
- Rab11a-依赖的回收测定方法.
主要成果:
- PIAS3 (KChAP) 被确定为HEK细胞中的Kv4.2和HCN2通道以及心肌细胞中的内源性Kv4.2/Kv4.3通道的SUMO E3结合酶.
- 在K579中对Kv4.2进行PIAS3介导的SUMOylation,通过 rab11a依赖的回收来增强通道表面表达.
- 在S552中Kv4.2的PKA酸化抑制Kv4.2的SUMOylation并减少Kv4通道电流.
- PKA酸化阻断了HEK细胞和心肌细胞中Kv4.2的PIAS3介导的SUMOylation.
结论:
- PIAS3 是Kv4.2 和 HCN2 离子通道的真实 SUMO E3 酶.
- 由PIAS3介导的SUMOylation通过一个依赖于rab11a的机制调节离子通道表面表达.
- PKA酸化对抗PIAS3介导的SUMOylation,从而控制Kv4通道活性和表面表达.
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