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- **************************************************
- * Photosystem I psaG and psaK proteins signature *
- **************************************************
-
- Photosystem I (PSI) [1] is an integral membrane protein complex that uses
- light energy to mediate electron transfer from plastocyanin to ferredoxin. PSI
- is found in the chloroplast of plants and cyanobacteria. PSI is composed of at
- least 14 different subunits; two of these subunits PSI-G (gene psaG) and PSI-K
- (gene psaK) are small hydrophobic proteins of about 7 to 9 Kd that are
- evolutionary related [2]. Both proteins seem to contain two transmembrane
- regions. Cyanobacteria seem to only encode for PSI-K.
-
- As a signature pattern, we selected the best conserved region which seems to
- correspond to the second transmembrane region.
-
- -Consensus pattern: G-F-x-[LIVM]-x-[DE]-x(2)-[GA]-x-[GT]-[SA]-x-G-H-x-[LIVM]-
- [GA]
- -Sequences known to belong to this class detected by the pattern: ALL.
- -Other sequence(s) detected in SWISS-PROT: NONE.
- -Last update: June 1994 / First entry.
-
- [ 1] Golbeck J.H.
- Biochim. Biophys. Acta 895:167-204(1987).
- [ 2] Kjaerulff S., Andersen B., Nielsen V.S., Moller B.L., Okkels J.S.
- J. Biol. Chem. 268:18912-18916(1993).
-