Unique constitution of photosystem I with a novel subunit in the cyanobacterium Gloeobacter violaceus PCC 7421
- 19 November 2004
- journal article
- research article
- Published by Wiley in FEBS Letters
- Vol. 578 (3), 275-279
- https://doi.org/10.1016/j.febslet.2004.11.013
Abstract
Constitution of the photosystem I complex isolated from the cyanobacterium Gloeobacter violaceus PCC 7421 was investigated by tricine-urea-SDS-PAGE, followed by peptide mass fingerprinting or N-terminal sequencing. Eight subunits (PsaA, PsaB, PsaC, PsaD, PsaE, PsaF, PsaL and PsaM) were identified as predicted from the genome sequence. A novel subunit (PsaZ) was discovered, but PsaI, PsaJ, PsaK and PsaX were absent. PsaB has a C-terminal extension with 155 amino acids in addition to the conserved region and this domain is similar to the peptidoglycan-binding domain. These results suggest that PS I complexes of G. violaceus have unique structural properties.Keywords
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