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Structure of a large photosystem II supercomplex from Acaryochloris marina
Author(s) -
Chen Min,
Bibby Thomas S.,
Nield Jon,
Larkum Anthony W.D.,
Barber James
Publication year - 2005
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/j.febslet.2005.01.023
Subject(s) - photosystem ii , chemistry , photosystem i , photosynthetic reaction centre , chlorophyll a , chlorophyll , photochemistry , photosynthesis , biochemistry , organic chemistry
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 Å × 240 Å. 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%.