在水溶液中具有结构特征的[ReI(CO) 3 (((phen) ((HisX) ]+ (X = 83, 109) 伪气球菌青素的兴奋状态动态
Ana María Blanco-Rodríguez1, Michael Busby, Cristian Gradinaru
1School of Biological and Chemical Sciences, Queen Mary, University of London, UK.
Journal of the American Chemical Society
|March 30, 2006
概括
研究人员使用时间分辨率红外光谱学研究了经过修改的Pseudomonas aeruginosa青体中的三重金属到配体电荷转移 ((3) MLCT). 蛋白质修饰显著改变了放松动态,由于水和蛋白质重组,显示了较慢的介质放松.
科学领域:
- 生物物理化学 生物物理化学
- 摄影化学的使用.
- 蛋白质工程是指蛋白质工程.
背景情况:
- 三重金属到配体的电荷转移 ((3) MLCT) 对于金属蛋白中的光物理过程至关重要.
- 了解蛋白质对兴奋状态动态的环境影响,是设计功能生物模拟系统的关键.
- 之前对更简单的复合物的研究提供了对比的基线.
研究的目的:
- 为了研究 (3) MLCT放松动态的改Pseudomonas aeruginosa青.
- 为了比较改性青与更简单的复合物的动态.
- 阐明蛋白质结构和溶剂环境在兴奋状态放松中的作用.
主要方法:
- 采用了皮秒时间分辨率红外光谱 (TRIR) 技术.
- 实验是在水性氧化 (D(2) O) 溶液中进行的.
- 研究了两个特定的亚苏林变体,Re(I) ((CO) (((3) (((phen) ((His83) Az和Re(I) ((CO) (((3) (((phen) ((His109) Az,进行了研究.
主要成果:
- (I) 碳基团的内分子振动放松是快速的 (4 ps),类似于更简单的模型.
- 中等放松动态在修改后的青色素中显著减缓 (约. 250 ps) 与与意达相关联的模型 (9.5 ps) 相比.
- 这种缓慢的放松是由于二氧化 (D(2) O) 的重定向和染色体和周围蛋白质残留物的结构重组.
结论:
- 蛋白质环境和溶剂重组在金属蛋白质合体的兴奋状态动态中起着主导作用.
- 特定的蛋白质矩阵及其与溶剂分子的相互作用决定了能量消散的时间尺度.
- 这些发现为基于金属蛋白的光敏剂和催化剂的设计提供了洞察力.
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