title: The structure of plant photosystem I super-complex at 2.8 Å resolution.
abstract: Most life forms on Earth are supported by solar energy harnessed by oxygenic photosynthesis. In eukaryotes, photosynthesis is achieved by large membrane-embedded super-complexes, containing reaction centers and connected antennae. Here, we report the structure of the higher plant PSI-LHCI super-complex determined at 2.8 Å resolution. The structure includes 16 subunits and more than 200 prosthetic groups, which are mostly light harvesting pigments. The complete structures of the four LhcA subunits of LHCI include 52 chlorophyll a and 9 chlorophyll b molecules, as well as 10 carotenoids and 4 lipids. The structure of PSI-LHCI includes detailed protein pigments and pigment-pigment interactions, essential for the mechanism of excitation energy transfer and its modulation in one of nature's most efficient photochemical machines.
authors.affiliation: Department of Biochemistry, The George S. Wise Faculty of Life Sciences, Tel Aviv University, Tel Aviv, Israel.
authors.forename: Yuval
authors.initials: Y
authors.lastname: Mazor
authors.affiliation: Department of Biochemistry, The George S. Wise Faculty of Life Sciences, Tel Aviv University, Tel Aviv, Israel.
authors.forename: Anna
authors.initials: A
authors.lastname: Borovikova
authors.affiliation: Department of Biochemistry, The George S. Wise Faculty of Life Sciences, Tel Aviv University, Tel Aviv, Israel.
authors.forename: Nathan
authors.initials: N
authors.lastname: Nelson
mesh_terms: D018360:Crystallography, X-Ray; D046911:Macromolecular Substances / Q000737:chemistry*; D008958:Models, Molecular; D045331:Photosystem I Protein Complex / Q000737:chemistry*; D010860:Pigments, Biological / Q000737:chemistry*; D010944:Plants / Q000737:chemistry* / Q000201:enzymology*; D011487:Protein Conformation
chemical_list: D046911:Macromolecular Substances; D045331:Photosystem I Protein Complex; D010860:Pigments, Biological
keywords: Pisum Sativum; biophysics; light adaptation; light harvesting; membrane structure; non photochemical quenching; plant biology; structural biology