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现在位置:凤凰游戏 > 凤凰游戏研进展 > 最新重要论文(影响因子PNAS及以上)
Structural basis for energy and electron transfer of the photosystem I–IsiA–flavodoxin supercomplex, Nature Plants, 10 Feb 2020
2020-02-10 | 【   凤凰游戏  】【打印】【关闭

Nature Plants凤凰游戏10 February, 2020,DOI:

Structural basis for energy and electron transfer of the photosystem I–IsiA–flavodoxin supercomplex

Peng Cao, Duanfang Cao, Long Si, Xiaodong Su, Lijin Tian, Wenrui Chang, Zhenfeng Liu, Xinzheng Zhang & Mei Li

Abstract

Under iron-deficiency stress, which occurs frequently in natural aquatic environments, cyanobacteria reduce the amount of iron-enriched proteins, including photosystem I (PSI) and ferredoxin (Fd), and upregulate the expression of iron-stress-induced proteins A and B (IsiA and flavodoxin (Fld)). Multiple IsiAs function as the peripheral antennae that encircle the PSI core, whereas Fld replaces Fd as the electron receptor of PSI. Here, we report the structures of the PSI3–IsiA18–Fld3 and PSI3–IsiA18 supercomplexes from Synechococcus sp. PCC 7942, revealing features that are different from the previously reported PSI structures, and a sophisticated pigment network that involves previously unobserved pigment molecules. Spectroscopic results demonstrated that IsiAs are efficient light harvesters for PSI. Three Flds bind symmetrically to the trimeric PSI core—we reveal the detailed interaction and the electron transport path between PSI and Fld. Our results provide a structural basis for understanding the mechanisms of light harvesting, energy transfer and electron transport of cyanobacterial PSI under stressed conditions.

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