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The intrinsic 22 kDa protein is a chlorophyll‐binding subunit of photosystem II
Author(s) -
Funk Christiane,
Schröder Wolfgang P.,
Green Beverley R.,
Renger Gernot,
Andersson Bertil
Publication year - 1994
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 - 10.1016/0014-5793(94)80513-x
Subject(s) - photosystem ii , light harvesting complexes of green plants , chlorophyll , chlorophyll a , protein subunit , photosystem i , p700 , chemistry , biology , photosynthesis , biochemistry , botany , gene
The intrinsic 22 kDa polypeptide associated with photosystem II (psbS protein) was found to be able to bind chlorophyll. Extraction of isolated photosystem II membranes with octyl‐thioglucopyranoside, followed by repetitive electrophoresis under partially denaturing conditions gave only one green band. It contained both chlorophyll a and chlorophyll b , exhibited an absorption maximum at 674 nm and a 77 K fluorescence peak at 675 nm. The chlorophyll‐protein band contained a single polypeptide of 22 kDa. Based on these results and on previous protein sequence comparisons, it is suggested that the psbS protein is a chlorophyll a/b binding polypeptide and should thus be denoted CP22.