酸化诱导的SUMOylation促进Ulk4在状尖端的凝聚,以转化刺信号
Mengmeng Zhou1, Yuhong Han1, Jin Jiang1,2
1Department of Molecular Biology, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA.
Journal of cell science
|April 2, 2025
概括
刺 (Hh) 信号传递涉及Stk36和Ulk4激酶,它们调节了主要尖的Gli2蛋白凝聚. 这一由酸化和SUMOylation驱动的过程对于在发育和组织修复过程中激活Hh通路至关重要.
科学领域:
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
- 发展生物学 发展生物学
背景情况:
- 刺 (Hh) 信号传递对于胚胎发育和组织平衡至关重要,由Gli转录因子介导.
- 在脊椎动物中,Hh信号传导依赖于主,但Gli蛋白在尖激活的确切机制尚不清楚.
研究的目的:
- 为了阐明 Gli2 局部化和激活在纤毛尖的机制,以响应 Shh 信号.
- 调查Unc-51类激酶 (Ulk) 家族成员,特别是Stk36和Ulk4在Hh通路调节中的作用.
主要方法:
- 研究了Stk36对Ulk4的酸化和SUMOylation,以应对Shh.
- 分析了Ulk4生物分子凝聚物的形成及其对Stk36和Gli2.2的招募.
- 利用仿突变和SUMOylation/SIM缺陷的Ulk4突变来评估通路激活.
主要成果:
- 通过Stk36介导的Ulk4酸化促进了Ulk4的SUMOylation,从而导致Ulk4在状尖端自组合成生物分子凝聚物.
- 这些凝结物招募Stk36和Gli2,促进Gli2的激活和随后的Hh通路信号.
- 在Ulk4SUMOylation或其SUMO相互作用动机 (SIM) 中的缺陷阻止了尖积累和Gli2激活,而相仿的Ulk4突变会导致构成性激活.
结论:
- Ulk4的酸化依赖的SUMOylation驱动了初级毛尖的激酶基质凝结.
- 这种机制对于通过调节 Gli2 的定位和激活来转导 Hh 信号至关重要.
- 这些发现揭示了涉及生物分子凝聚物形成的Hh通路信号传递的新型调节机制.
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