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TitleA unique supramolecular organization of photosystem I in the moss Physcomitrella patens.
Journal, issue, pagesNat Plants, Vol. 4, Issue 11, Page 904-909, Year 2018
Publish dateOct 29, 2018
AuthorsMasakazu Iwai / Patricia Grob / Anthony T Iavarone / Eva Nogales / Krishna K Niyogi /
PubMed AbstractThe 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) ...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.
External linksNat Plants / PubMed:30374090 / PubMed Central
MethodsEM (single particle)
Resolution11.6 Å
Structure data

9107

6mem

EMDB-9107, PDB-6mem:
A unique supramolecular organization of photosystem I in the moss Physcomitrella patens
Method: EM (single particle) / Resolution: 11.6 Å

Source
  • physcomitrella patens (plant)
KeywordsPHOTOSYNTHESIS / complex / photosystem I / light harvesting complex / Physcomitrella

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