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

Kintake Sonoike, Masahiko Ikeuchi, Himadri B. Pakrasi

Research output: Contribution to journalArticle

8 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)987-990
Number of pages4
JournalPlant Molecular Biology
Issue number5
Publication statusPublished - 1992 Dec 1



  • Anabaena
  • N-terminal processing
  • Photosystem I
  • cyanobacteria

ASJC Scopus subject areas

  • Agronomy and Crop Science
  • Genetics
  • Plant Science

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