N-终端氨酸乙化和氧化模式可能定义蛋白质稳定性
Karen C Heathcote1,2,3, Thomas P Keeley2, Matti Myllykoski4
1Department of Chemistry, University of Oxford, OX1 3TA, Oxford, UK.
Nature communications
|June 25, 2024
概括
氧气稳态依赖于O2感应酶. 这项研究揭示了如何通过特定的氨基酸序列调节N端氨酸乙化和氧化,影响依赖氧气的蛋白质稳定性.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 细胞生理学 细胞生理学
背景情况:
- 氧气稳定至关重要,由O2感应酶维持,这些酶会触发对缺氧的适应性反应.
- 酶ADO针对RGS4/5和IL32等蛋白质通过氧化N终端氨酸,通过氨酸/氨酸N降解途径降解.
- 识别额外的ADO基质是有限的,可能是由于竞争的N-终端囊蛋白修饰,如乙化.
研究的目的:
- 为了研究ADO催化氧化和NATA催化乙化N终端半氨酸残留物之间的相互作用.
- 为了识别指导N端半氨酸的氧化或乙化的序列决定因素.
- 了解对依赖氧气的蛋白质稳定性和低氧反应的影响.
主要方法:
- 通过体外和体内实验来评估人类N-终端囊氨酸的N-终端囊氨酸酸化.
- 分析蛋白序列以确定ADO (氧化) 和NatA (乙化) 的基质特异性.
- 调查这两个修改的相互排他性.
主要成果:
- 人类NatA在体外和体内都能催化N-终端氨酸乙化.
- 下游的氨基酸序列决定了N端的氨基酸是否被ADO氧化 (偏好基本/芳香残留物) 或被NatA (偏好酸性/极性残留物) 乙化.
- 这些修改似乎相互排斥,表明不同的蛋白池.
结论:
- 序列上下文是通过氧化或乙化对N端氨酸修饰的一个关键决定因素.
- 这些发现揭示了蛋白质稳定性对氧含量反应的调节.
- 这项研究提供了对控制低氧反应的机制的见解.
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