在蛋白质组中的化部位生成的脱氨基酸中添加LanCL
Kuan-Yu Lai1, Sébastien R G Galan2, Yibo Zeng3
1Department of Biochemistry, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA.
Cell
|May 1, 2021
概括
由排泄反应造成的蛋白质损伤由LanCL酶修复,这些酶将谷添加到脱氨酸/脱丁氨酸中. 这种C- 氨基化使异常激酶失活,对生理功能至关重要,防止过早死亡.
科学领域:
- 生物化学
- 分子生物学
- 蛋白质组学
背景情况:
- 酶介导的修复对于核酸来说是常见的,但对于蛋白质来说是罕见的.
- 蛋白质损伤,例如将化Ser/Thr排出脱氨酸/脱丁氨酸 (Dha/Dhb),发生在衰老和疾病中.
- 不同于参与抗菌的细菌LanC酶,真核类LanC酶的功能尚不清楚.
研究的目的:
- 调查真核细胞LanCL酶的功能.
- 探索LanCLs在修复蛋白质损伤中的作用.
- 了解LanCL介导蛋白质修复的生理意义.
主要方法:
- 开发了Dha/Dhb在蛋白质中选择性结合的化学酶方法.
- 使用人类MAPK-MEK1激酶来研究消除损伤和LanCL活性.
- 分析内源性蛋白质 (eliminylome),以确定消除反应造成的损伤.
主要成果:
- 在蛋白质中,LanCLs催化了对Dha/Dhb的添加,形成了不可逆转的C-谷氨基化.
- 在MAPK-MEK1中设计的"消除损伤"导致异常激活,而LanCL介导的C-基化反转了这种情况.
- 消除蛋白质损伤是电友反应的来源.
结论:
- 通过消除反应产生的反应性电友来修复蛋白质损伤的酶.
- 通过LanCL介导的C- 谷氨基化保护蛋白质组免受排泄损害的潜在失调作用.
- 通过LanCL淘汰小鼠的过早死亡,强调了修复这种蛋白质损伤的生理重要性.
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