The first analysis of PSI high-resolution 3D structure of eukaryoyogeneral algae.

Photosystem I (Photosystem I, PSI) is an important superpigment-protein complex that performs photosynthesis photosynthesis.
it captures solar energy through a complex network of pigments and converts light energy into chemical energy by driving transmembrane electron transfer, known as nature's most efficient light energy conversion device.
at present, the high-resolution structure of primary bio-cyanobacteria PSI and higher plant pea PSI capture pigment protein complex I (LHCI), but the study of PSI high-resolution 3D structure of psI algae such as red algae transitioning from prokaryote to eyre bionuclear organisms is still a blank.
research team led by Yu Tingyun, a researcher at the Institute of Botany of the Chinese Academy of Sciences and a member of the Chinese Academy of Sciences, and Shen Jianren, a researcher, has been engaged in the structural and functional research of photosynthesis supercomplexes for a long time.
recently, the team, in collaboration with Tsinghua University professor and academician of the Chinese Academy of Sciences, Yu Senfang, used single-particle cryoscope technology to analyze for the first time the 3.63-resolution 3.63 resolution structure of the red algae PSI core and the photosensitive antenna complex (PSI-LHCR).
study found that there are two PSI-LHCR structure states in red algae, combining 5 and 3 LHCR, respectively, and that, unlike all LHCI in higher plants on the psI core side, two additional LHCR proteins combined with 5 LHCR red algae PSI-LCR are located on the opposite side, showing a significantly different structure from the higher plant PSI-LHCI, showing the characteristics of red PSI-LHCR in the original form.
studies show that the core of the red algae PSI has some characteristics of cyanobacteria PSI, but also some characteristics of higher plant PSI, confirming that the red algae PSI is an intermediate type of evolution from prokaryote to emanalital.
researchers also confirmed for the first time the position and binding of psaO sub-inquisition in PSI, as well as the unique pigment composition of red algae LHCR.
the study not only reveals the unique structure and energy transfer characteristics of red algae PSI-LHCR, but also shows the adaptability of red algae PSI structure to environmental changes, as well as structural changes in the evolution of PSI from prokarnosis to eukaryotic organisms, which is of great significance for clarifying the evolution and function of PSI.
this is another important development for the team following the analysis of high-resolution 3D structures of psI-LHCI in higher plants in 2015.
the findings were published online April 9 in the Proceedings of the National Academy of Sciences (PNAS), an international academic journal.
, Ph.D. candidate Pi Xiong of Tsinghua University and Tian Lirong, a postdoctoral fellow in the Research Group of Shen Jianren of the Institute of Plants, are co-authors of the paper, Shen Jianren and Yan Senfang are co-authors, and Yu Tingyun is involved in the overall design of the study.
the research has been co-funded by the Ministry of Science and Technology's National Key Research and Development Program, the National Natural Science Foundation of China, the leading projects of the Chinese Academy of Sciences, the key projects of the frontier and the Dean's Fund.
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