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Identities of four low‐molecular‐mass subunits of the photosystem I complex from Anabaena variabilis ATCC 29413
Author(s) -
Ikeuchi Masahiko,
Nyhus Karin J.,
Inoue Yorinao,
Pakrasi Himadri B.
Publication year - 1991
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(91)80003-l
Subject(s) - anabaena variabilis , protein subunit , molecular mass , photosystem i , homology (biology) , biochemistry , cyanobacteria , biology , anabaena , photosystem ii , chloroplast , amino acid , peptide sequence , gene , gel electrophoresis , microbiology and biotechnology , chemistry , photosynthesis , enzyme , bacteria , genetics
Photosystem I (PSI) complex of Anabaena variabilis ATCC 29413 consists of at least 11 subunits, 9 of which are resolved by high resolution gel electrophoresis. N‐terminal amino acid sequences of the four subunits with molecular masses of 6.8, 5.2, 4.8 and 3.5 kDa were determined. Based on the sequence homology, the 3.5 kDa subunit was revealed to correspond to PSI‐I (the gene product of psa I), which had so far been detected only in higher plant PSI complexes. The 6.8 kDa protein and 4.8 kDa protein were identified as gene products of psa K and psa J, respectively. The 5.2 kDa protein was homologous to a 4.8 kDa subunit of PSI of the thermophilic cyanobacterium Synechococcus vulcanus , suggesting that this protein is a component of PSI in cyanobacteria.