title: Structure of a large photosystem II supercomplex from Acaryochloris marina.
abstract: Acaryochloris marina is a prochlorophyte-like cyanobacterium containing both phycobilins and chlorophyll d as light harvesting pigments. We show that the chlorophyll d light harvesting system, composed of Pcb proteins, functionally associates with the photosystem II (PSII) reaction center (RC) core to form a giant supercomplex. This supercomplex has a molecular mass of about 2300 kDa and dimensions of 385 A x 240 A. It is composed of two PSII-RC core dimers arranged end-to-end, flanked by eight symmetrically related Pcb proteins on each side. Thus each PSII-RC monomer has four Pcb subunits acting as a light harvesting system which increases the absorption cross section of the PSII-RC core by almost 200%.
authors.affiliation: School of Biological Sciences, University of Sydney, Sydney, NSW 2006, Australia.
authors.forename: Min
authors.initials: M
authors.lastname: Chen
authors.forename: Thomas S
authors.initials: TS
authors.lastname: Bibby
authors.forename: Jon
authors.initials: J
authors.lastname: Nield
authors.forename: Anthony W D
authors.initials: AW
authors.lastname: Larkum
authors.forename: James
authors.initials: J
authors.lastname: Barber
mesh_terms: D000458:Cyanobacteria / Q000737:chemistry* / Q000648:ultrastructure; D008854:Microscopy, Electron; D045332:Photosystem II Protein Complex / Q000737:chemistry* / Q000648:ultrastructure*; D013057:Spectrum Analysis; D020524:Thylakoids / Q000737:chemistry
chemical_list: D045332:Photosystem II Protein Complex