Singlet oxygen production by PSII under light stress: mechanism, detection and the protective role of β-carotene.

Singlet oxygen production by PSII under light stress: mechanism, detection and the protective role of β-carotene.
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DOI:
10.1093/pcp/pcu040
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发表时间:
2014-07
影响因子:
4.9
通讯作者:
Telfer A
Telfer A
中科院分区:
生物学2区
文献类型:
--
作者:
Telfer A

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在这篇综述中,我概述了从分离的PSII反应中心复合体的实验中获得的单线态氧(1O2)形成的间接证据。综述了我们直接测量单线态氧的方法,包括稳态和时间分辨的1270 nm发光法。我们使用的其他方法是组氨酸催化的分子氧摄取(使1O2产量能够测量),以及染料漂白和差异吸收光谱,以确定1O2的猝灭剂可以从哪里获得这种有毒物种。我们还证明了结合在Chl-蛋白质复合体中的类胡萝卜素的保护行为,这导致了反应中心复合体内大量的1O2猝灭。最后,我描述了这些技术是如何在光抑制和1O2作为信号分子在激发细胞对各种胁迫因素的反应中的作用的研究中被使用和扩展的。我还讨论了目前对氧分子作为信号分子的作用以及它可能在细胞内传播的距离的看法。
In this review, I outline the indirect evidence for the formation of singlet oxygen (1O2) obtained from experiments with the isolated PSII reaction center complex. I also review the methods we used to measure singlet oxygen directly, including luminescence at 1,270 nm, both steady state and time resolved. Other methods we used were histidine-catalyzed molecular oxygen uptake (enabling 1O2 yield measurements), and dye bleaching and difference absorption spectroscopy to identify where quenchers of 1O2 can access this toxic species. We also demonstrated the protective behavior of carotenoids bound within Chl–protein complexes which bring about a substantial amount of 1O2 quenching within the reaction center complex. Finally, I describe how these techniques have been used and expanded in research on photoinhibition and on the role of 1O2 as a signaling molecule in instigating cellular responses to various stress factors. I also discuss the current views on the role of 1O2 as a signaling molecule and the distance it might be able to travel within cells.
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