Structure and assembly mechanism of plant C2S2M2-type PSII-LHCII supercomplex, Science, Vol. 357, Issue 6353, pp. 815-820, 25 Aug 2017
发布时间：2017年08月31日
Science, Vol. 357, Issue 6353, pp. 815-820, 25 Aug 2017, DOI: 10.1126/science.aan0327
Structure and assembly mechanism of plant C2S2M2-type PSII-LHCII supercomplex
Xiaodong Su, Jun Ma, Xuepeng Wei, Peng Cao, Dongjie Zhu, Wenrui Chang, Zhenfeng Liu, Xinzheng Zhang, Mei Li
Abstract
In plants, the photosynthetic machinery photosystem II (PSII) consists of a core complex associated with variable numbers of light-harvesting complexes II (LHCIIs). The supercomplex, comprising a dimeric core and two strongly bound and two moderately bound LHCIIs (C2S2M2), is the dominant form in plants acclimated to limited light. Here we report cryo–electron microscopy structures of two forms of C2S2M2 (termed stacked and unstacked) from Pisum sativum at 2.7- and 3.2-angstrom resolution, respectively. In each C2S2M2, the moderately bound LHCII assembles specifically with a peripheral antenna complex CP24-CP29 heterodimer and the strongly bound LHCII, to establish a pigment network that facilitates light harvesting at the periphery and energy transfer into the core. The high mobility of peripheral antennae, including the moderately bound LHCII and CP24, provides insights into functional regulation of plant PSII.
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Structure and assembly mechanism of plant C2S2M2-type PSII-LHCII supercomplex, Science, Vol. 357, Issue 6353, pp. 815-820, 25 Aug 2017
Science, Vol. 357, Issue 6353, pp. 815-820, 25 Aug 2017, DOI: 10.1126/science.aan0327
Structure and assembly mechanism of plant C2S2M2-type PSII-LHCII supercomplex
Xiaodong Su, Jun Ma, Xuepeng Wei, Peng Cao, Dongjie Zhu, Wenrui Chang, Zhenfeng Liu, Xinzheng Zhang, Mei Li
Abstract
In plants, the photosynthetic machinery photosystem II (PSII) consists of a core complex associated with variable numbers of light-harvesting complexes II (LHCIIs). The supercomplex, comprising a dimeric core and two strongly bound and two moderately bound LHCIIs (C2S2M2), is the dominant form in plants acclimated to limited light. Here we report cryo–electron microscopy structures of two forms of C2S2M2 (termed stacked and unstacked) from Pisum sativum at 2.7- and 3.2-angstrom resolution, respectively. In each C2S2M2, the moderately bound LHCII assembles specifically with a peripheral antenna complex CP24-CP29 heterodimer and the strongly bound LHCII, to establish a pigment network that facilitates light harvesting at the periphery and energy transfer into the core. The high mobility of peripheral antennae, including the moderately bound LHCII and CP24, provides insights into functional regulation of plant PSII.
相关报道：http://www.ibp.cas.cn/kyjz/zxdt/201708/t20170826_4852034.html
文章链接：http://science.sciencemag.org/content/357/6353/815