对于基质特异性和库林-3 Ubiquitination 所需的 RhoBTB1 的结构和功能
Gaurav Kumar1, Shi Fang1, Daria Golosova1
1Department of Physiology, Cardiovascular Center, Medical College of Wisconsin, Milwaukee, WI 53226, USA.
Function (Oxford, England)
|August 14, 2023
概括
含有Rho相关的BTB域1 (RhoBTB1) 通过控制基化酶5 (PDE5) 活性来调节血管度. RhoBTB1通过库林-3 (CUL3) 综合体对PDE5进行降解,从而影响SETD2水平.
科学领域:
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
- 生物化学 生物化学
背景情况:
- 血管调节对心血管健康至关重要.
- 固酶5 (PDE5) 在调节血管光滑肌肉放松方面发挥着重要作用.
- 了解PDE5活动的上游调节者对于开发新型治疗策略至关重要.
研究的目的:
- 为了确定代酶5 (PDE5) 活性的新型调节剂.
- 阐明含有1 (RhoBTB1) 的Rho相关BTB域控制PDE5.5的分子机制.
- 调查RhoBTB1-PDE5相互作用的下游目标和功能后果.
主要方法:
- 对RhoBTB1的截断分析以确定功能域.
- 同免疫沉测试以确认蛋白质与蛋白质相互作用.
- 位点定向突变发生,以精确确定关键氨基酸残留物.
- 亚酸盐过氧化酶2 (APEX2) 接近性标签,以识别新的结合伙伴.
- 通过siRNA介导的淘汰和药理抑制来研究蛋白质调节.
主要成果:
- 含有Rho相关的BTB域1 (RhoBTB1) 直接通过Cullin-3 (CUL3) E3泛素合酶复合体直接与化酶5 (PDE5) 结合并向蛋白质体降解.
- 在RhoBTB1的C端半端,特别是C端域,对于PDE5的招募和降解至关重要.
- 在RhoBTB1中的关键残留物Pro353和Ser363对于CUL3结合至关重要,影响PDE5降解.
- 含有2 (SETD2) 的SET域被确定为一种新的RhoBTB1结合伙伴,其水平由RhoBTB1-CUL3轴调节.
结论:
- 通过控制PDE5活性和降解,RhoBTB1充当血管度的关键调节者.
- 在RhoBTB1-CUL3复合体中介于PDE5.5的泛化和蛋白质体降解.
- SETD2是一种由RhoBTB1-CUL3通路调节的新型下游效应因子,这表明它在细胞过程中发挥了更广泛的作用.
- 需要进一步研究以确定SETD2在心血管功能中的作用.
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