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克隆和表达的氧化合成酶在结构上类似于细胞染色体P-450减少酶
D S Bredt1, P M Hwang, C E Glatt
1Department of Neuroscience, Johns Hopkins Medical Institutions, Baltimore, Maryland 21205.
Nature
|June 27, 1991
概括
研究人员确定了大脑的氧化合成酶,这对血管放松和大脑通信至关重要. 它的结构表明由多个因素调节,类似于cytochrome P-450降解酶.
科学领域:
- 生物化学 生物化学
- 神经科学是一个神经科学.
- 分子生物学分子生物学
背景情况:
- 氧化 (NO) 作为各种生理过程中的关键信号分子.
- NO在血管中介于内皮衍生的放松因子效应.
- NO参与巨细胞毒性和大脑内的神经元通信.
研究的目的:
- 克隆和表征用于大脑氧化合成酶 (NOS) 的补充DNA (cDNA).
- 为了确定大脑NOS酶中的调节部位.
主要方法:
- 补充DNA (cDNA) 克隆技术被用来分离大脑NOS的基因.
- 生物信息分析被用来预测酶的结构和功能.
主要成果:
- 克隆的大脑NOScDNA揭示了NADPH,FAD,弗拉单核酸和calmodulin等辅助因子的特定识别点.
- 该酶还具有酸化位点,表明具有复杂调节的潜力.
- 同类性搜索确定了细胞染色体P-450减少酶作为唯一已知的具有显著相似性的哺乳动物酶.
结论:
- 大脑氧化合成酶是一种复杂的酶,由多种因素调节,包括辅助因子,calmodulin和酸化.
- 与细胞染色体P-450减少酶的结构相似性为NOS酶机制提供了洞察力.
- 了解大脑NOS调节对于其在血管和神经功能中的作用至关重要.
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