PROSITE documentation PDOC00217Photosynthetic reaction center proteins signature
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PURL: https://purl.expasy.org/prosite/documentation/PDOC00217
In the photosynthetic reaction center of purple bacteria, two homologous integral membrane proteins, L(ight) and M(edium), are known to be essential to the light-mediated water-splitting process. In the photosystem II of eukaryotic chloroplasts two related proteins are involved: the D1 (psbA) and D2 proteins (psbD). These four types of protein probably evolved from a common ancestor [see 1,2 for recent reviews].
We developed a signature pattern which include two conserved histidine residues. In L and M chains, the first histidine is a ligand of the magnesium ion of the special pair bacteriochlorophyll, the second is a ligand of a ferrous non-heme iron atom. In photosystem II these two histidines are thought to play a similar role.
Expert(s) to contact by email: Last update:December 2001 / Pattern and text revised.
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| 1 | Authors | Michel H. Deisenhofer J. |
| Source | Biochemistry 27:1-7(1988). |
| 2 | Authors | Barber J. |
| Source | Trends Biochem. Sci. 12:321-326(1987). |
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