墨洛氨酸形成了具有强烈巴托克罗米的吸收最大值的巴克蒂奥罗多普辛
Megan J Mackintosh1, Dorothee Hoischen2,3, Hans-Dieter Martin2
1Fritz Haber Center for Molecular Dynamics, Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem, Israel.
概括
研究人员开发了新型的梅洛胺染料,以转移生物分子吸收率,用于光遗传学和光药理学. 与原生bacteriorhodopsin相比,这些在bacteriorhodopsin中的合成染色体实现了显著的红色转移,增强了光和减少了Stokes转移.
科学领域:
- 生物物理学的生物物理.
- 摄影化学的使用.
- 分子生物学分子生物学
背景情况:
- 生物分子吸收率需要转移到光遗传学和光药理学的组织光学透明度窗口.
- 细菌 (Bacteriorhodopsin,简称BR) 是一种光驱动的质子,其视网膜染色体在568nm吸收.
- 红移吸收最大值的策略对于先进的生物应用至关重要.
研究的目的:
- 在bacteriorhodopsin中合成 merocyanine染料作为视网膜替代品.
- 为了实现吸收最大的低色变化,以提高光学性能.
- 研究这些新型染色蛋白的光物理性质和结构基础.
主要方法:
- 合成了11种梅洛氨酸染料.
- 染料与bacterioopsin (bO) 组合在一起形成染色蛋白.
- 染料和染色蛋白的光谱分析 (吸收,光).
- 量子化学计算 (ADC(2),QM/MM) 用于理论验证.
主要成果:
- 稳定,共价结合的染色蛋白形成了显著的红移吸收带.
- 对9,2和8等色素的红色偏移最大,吸收最大分别在766,755和736nm.
- 基于merocyanine的染色蛋白表现出光量子产量数量级更高,Stokes转移明显小于本地br.
- 计算方法与实验数据有很好的一致性,并阐明了底色变化的起源.
结论:
- 墨氨酸染料可以有效地替代 retinal 在 bacteriorhodopsin 实现大量的红色转移在吸收.
- 这些新型染色蛋白具有优越的光特性,与本地BR相比,减少了斯托克斯转移.
- 这些发现为开发用于治疗和研究应用的先进光活性生物分子提供了基础.
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