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Comparative Study
. 1992 Dec;20(5):987-90.
doi: 10.1007/BF00027168.

Presence of an N-terminal presequence in the PsaI protein of the photosystem I complex in the filamentous cyanobacterium Anabaena variabilis ATCC 29413

K Sonoike  1 , M Ikeuchi, H B Pakrasi
Affiliations
Comparative Study

Presence of an N-terminal presequence in the PsaI protein of the photosystem I complex in the filamentous cyanobacterium Anabaena variabilis ATCC 29413

K Sonoike et al. Plant Mol Biol. 1992 Dec.

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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