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Heptameric association of light‐harvesting complex II trimers in partially solubilized photosystem II membranes
Author(s) -
Dekker Jan P.,
van Roon Henny,
Boekem Egbert J.
Publication year - 1999
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/s0014-5793(99)00442-1
Subject(s) - trimer , photosystem ii , membrane , thylakoid , chemistry , spinach , biophysics , supramolecular chemistry , crystallography , photosystem i , photosystem , light harvesting complex , photochemistry , chloroplast , photosynthesis , biology , biochemistry , dimer , crystal structure , organic chemistry , gene
We report a structural characterization by electron microscopy and image analysis of a supramolecular complex consisting of seven trimeric light‐harvesting complex II proteins. The complex was readily observed in partially‐solubilized Tris‐washed photosystem II membranes from spinach but was also found to occur, with a low frequency, in oxygen‐evolving photosystem II membranes. The structure reveals six peripheral trimers with the same rotational orientation and a central trimer with the opposite orientation. We conclude that the heptamer represents a naturally occurring aggregation state of part of the light‐harvesting complex II trimers in the thylakoid membranes.