Abstract
The psaI gene encoding the 5.2 kDa protein component (PsaI) of the photosystem I complex was cloned from the cyanobacterium Anabaena 29413. The gene is present in single copy in this cyanobacterial genome. The nucleotide sequence of a 500 bp region of the cloned DNA revealed the presence of an open reading frame encoding a 46 amino acid long polypeptide. The N-terminal 11 residues are absent in the mature polypeptide and thus represents the first identified cleavable presequence on the PsaI protein. We suggest that this presequence directs the N-terminus of the protein to the thylakoid lumen.
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Sonoike, K., Ikeuchi, M. & Pakrasi, H.B. Presence of an N-terminal presequence in the PsaI protein of the Photosystem I complex in the filamentous cyanobacterium Anabaena variabilis ATCC 29413. Plant Mol Biol 20, 987–990 (1992). https://doi.org/10.1007/BF00027168
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DOI: https://doi.org/10.1007/BF00027168