In all photosynthetic systems, the primary energy transduction event is the light-induced generation of a charge-separated state in a pigment-protein complex. Although the specific pathways vary among organisms, the general pattern is remarkably conserved, and an understanding of these processes serves as the basis for current designs of artificial systems that mimic the photosynthetic process. The reaction center from Rhodobacter sphaeroides has long been used as a model for photosystem II, and our group has incorporated features of photosystem II such as a highly oxidizing primary donor that is capable of oxidizing tyrosine residues. We have characterized a mononuclear Mn cofactor bound at a location analogous to that of the Mn cluster of photosystem II (Fig. 1). The availability of reaction centers with highly oxidizing donors and a Mn-binding site provides the opportunity to study novel manganese cofactors and to introduce new light-driven reactions into this photosystem.
|Effective start/end date||7/15/12 → 6/30/15|
- National Science Foundation (NSF): $685,223.00