对CRY2昼夜时钟组件变体p.Ser420Phe的功能性表征揭示了CRY2的新降解途径
Gizem Cagla Parlak1, Ibrahim Baris1, Seref Gul2
1Department of Molecular Biology and Genetics, Koc University, Istanbul, Turkiye.
The Journal of biological chemistry
|November 11, 2023
概括
一种罕见的加密染色体2 (CRY2) 变体显示抑制减少和降解改变,揭示了CRY2调节的新型 lysosomal 途径,并影响昼夜节律周期长度.
科学领域:
- 分子生物学分子生物学
- 时间生物学 时间生物学
- 遗传学 遗传学 是一个
背景情况:
- 加密染色体 (CRYs) 是生物钟中的关键转录抑制剂.
- 在昼夜节律中CRY功能的确切机制尚未完全理解.
研究的目的:
- 为了研究位于CC-螺旋区域的罕见CRY2变异 (p.Ser420Phe) 的功能影响.
- 阐明这种CRY2变体的降解途径和对昼夜节律的影响.
主要方法:
- 使用公共数据库识别了一种罕见的CRY2变种 (p.Ser420Phe).
- 进行了细胞功能性特征,包括评估转录抑制,蛋白相互作用,核转位和降解途径 (蛋白质和溶酶体).
- 在淘汰赛小鼠胚胎纤维细胞中进行了补充研究.
主要成果:
- 这种p.Ser420Phe CRY2变种显示了CLOCK:BMAL1转录的抑制减少.
- 这种变体对PER2的亲和力下降,核转位受损,并且由于E3酶相互作用的丧失,对蛋白质体降解的抵抗力下降.
- 确定了CRY2的新型溶酶体降解途径.
- 这种CRY2变异缩短了淘汰细胞的昼夜周期长度,与CRY2缺乏细胞中长期存在的情况不同.
结论:
- CRY2的Ser-420对E3酶相互作用和蛋白质酶降解至关重要.
- CRY2通过蛋白质和 lysosomal 途径降解.
- 这种CRY2变异揭示了一种影响昼夜节律周期长度的新调节机制.
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