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A new photosystem II reaction center component (4.8 kDa protein) encoded by chloroplast genome
Author(s) -
Ikeuchi Masahiko,
Inoue Yorinao
Publication year - 1988
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(88)81039-1
Subject(s) - photosynthetic reaction centre , gene , chloroplast , operon , photosystem ii , open reading frame , biology , genome , homology (biology) , genetics , photosystem i , peptide sequence , chemistry , biochemistry , photosynthesis , escherichia coli
The photosystem II reaction center complex, so‐called D1‐D2‐cytochrome b ‐559 complex, isolated from higher plants contains a new component of about 4.8 kDa [(1988) Plant Cell Physiol. 29, 1233–1239]. The partial amino acid sequence of this component from spinach was determined after release of N‐terminal blockage. The determined sequence matched an open reading frame (ORF36) of the chloroplast genome from tobacco and liverwort, which is located downstream from the psb K gene and forms an operon with psb K. The predicted product consists of 36 amino acid residues and has a single membrane‐spanning segment. High homology between the tobacco and liverwort genes, and its presence in the reaction center complex suggest an important role for this component in the photosystem II complex. Since this gene corresponds to a part of the formerly designated psb I gene, we propose to revise the definition of psb I as the gene encoding the 4.8 kDa reaction center component.