红色/绿色的蓝菌染色体通过异构化,从菲科亚诺比林变成菲科亚诺比林
Hiroki Hoshino1, Keita Miyake2, Keiji Fushimi1
1Graduate School of Science, Tokyo Metropolitan University, Hachioji, Tokyo, Japan.
Protein science : a publication of the Protein Society
|July 29, 2024
概括
研究人员发现了新型的菌染色体 (CBCRs),其异构化基素 (PCB) 到基素 (PVB),扩大了已知的扩展红/绿 (XRG) CBCRs的多样性及其分子可塑性.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 摄影化学的使用.
背景情况:
- 菌染色体 (CBCRs) 是菌特有的光受体,与植物染色体相关.
- 根据保存残留物和染色体处理,CBCRs被分类为DXCF或扩展红/绿 (XRG).
- XRG CBCRs通常在没有异构化的情况下结合基亚诺林 (PCB),显示红/绿光转化.
研究的目的:
- 通过非典型的氨基酸替代来研究新型XRG CBCRs.
- 描述这些新型XRG CBCRs的染色体结合和异构化能力.
- 为了确定参与PCB异构化机制的关键残留物.
主要方法:
- 基于序列和结构的比较分析.
- 现场指导的突变发生实验.
- 染色体光转换的光谱分析.
主要成果:
- 发现新型XRG CBCRs含有Cys残留物,而不是保存的Trp.
- 这些新型的CBCR将PCB异构化为Phycoviolobilin (PVB),呈现出绿色/色可逆光转化.
- 确定三种关键氨基酸残留物,包括Cys,对于PCB到PVB的异构化至关重要.
结论:
- 这项研究揭示了一种具有明显染色体异构化能力的新一类XRG CBCRs.
- 这些发现突显了CBCRs的分子可塑性,并扩大了这种光受体家族内已知的功能多样性.
- 鉴定到的残留物提供了关于CBCRs中PCB异构化机制的见解.
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