在血红蛋白中的新型胺-血红素共价链接
B Christie Vu1, A Daniel Jones, Juliette T J Lecomte
1Department of Chemistry and the Center for Biomolecular Structure and Function, The Pennsylvania State University, University Park, Pennsylvania 16802, USA.
Journal of the American Chemical Society
|July 18, 2002
概括
赛内科囊血红蛋白通过涉及血红蛋白的化学反应,通过血红蛋白连接到其多链.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 蛋白质化学 蛋白质化学
背景情况:
- 来自Synechocystis sp. 的重组血红蛋白. PCC 6803是研究血红蛋白相互作用的模型系统.
- 血红蛋白与血红蛋白的结合对血红蛋白的功能至关重要,但精确的化学机制尚未完全理解.
研究的目的:
- 为了阐明血红附着在Synechocystis血红蛋白中的化学机制.
- 为了确定在血红素和蛋白质上的特定反应组.
主要方法:
- 核磁共振 (NMR) 光谱学 (1H,同核,1H-15N) 的使用
- 培消化剂的质谱 (MS) 测量
- 化学修饰研究使用dithionite和修饰的氨酸.
主要成果:
- 在中性pH值下对dithionite的治疗诱导了对Synechocystis血红蛋白的快速血红附着.
- 血红素的2 - 乙烯基组被确定为反应部分.
- 质谱学定位了附着部位与C端12-mer的附着部位.
- 核磁共振 (NMR) 鉴定出Histidine 117 (His117) 作为修改后的残留物,其中意达环的nepsilon与heme的乙烯基calpha反应.
- 对于 Zn protoporphyrin IX 没有发生修改,这表明减少血红铁是必不可少的.
结论:
- 这项研究揭示了一种新的化学途径,用于将血红素附着在全球蛋白上.
- 这种反应涉及基的乙烯基组对基因残留物的直接修饰,通过dithionite诱导的减少来促进.
- 这些发现提供了对翻译后修改和血红蛋白交叉链接机制的见解.
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