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A unique supramolecular organization of photosystem I in the moss Physcomitrella patens

Journal Article · · Nature Plants
 [1];  [1];  [2];  [1];  [1]
  1. Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  2. Univ. of California, Berkeley, CA (United States)

The photosynthesis machinery in chloroplast thylakoid membranes is comprised of multiple protein complexes and supercomplexes. Here, we show a novel supramolecular organization of photosystem I (PSI) in the moss Physcomitrella patens by single-particle cryo-electron microscopy. The moss-specific light-harvesting complex (LHC) protein Lhcb9 is involved in this PSI supercomplex, which has been shown to have a molecular density similar to that of the green alga Chlamydomonas reinhardtii. Our results show that the structural organization is unexpectedly different—two rows of the LHCI belt exist as in C. reinhardtii, but the outer one is shifted toward the PsaK side. Furthermore, one trimeric LHC protein and one monomeric LHC protein position alongside PsaL/K, filling the gap between these subunits and the outer LHCI belt. We provide evidence showing that Lhcb9 is a key factor, acting as a linkage between the PSI core and the outer LHCI belt to form the unique supramolecular organization of the PSI supercomplex in P. patens.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1532292
Journal Information:
Nature Plants, Journal Name: Nature Plants Journal Issue: 11 Vol. 4; ISSN 2055-0278
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (5)

Formation of a PSI–PSII megacomplex containing LHCSR and PsbS in the moss Physcomitrella patens journal September 2019
Natively oxidized amino acid residues in the spinach PS I-LHC I supercomplex journal January 2020
A LHCB9-dependent photosystem I megacomplex induced under low light in Physcomitrella patens journal October 2018
The rise and fall of Light-Harvesting Complex Stress-Related proteins as photoprotection agents during evolution journal August 2019
Isolation and characterization of a large photosystem I–light‐harvesting complex II supercomplex with an additional Lhca1–a4 dimer in Arabidopsis journal January 2020

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