A semisynthetic peptide-metalloporphyrin responsive matrix for artificial photosynthesis
Autor/innen
- Z. Sun
- C.A. Diebolder
- L. Renault
- H. de Groot
Journal
- ChemPhotoChem
Quellenangabe
- ChemPhotoChem 3 (8): 630-635
Zusammenfassung
The CsmA protein from the baseplate of the Chlorobaculum tepidum is proposed as an attractive motif for the engineering of semisynthetic materials for artificial photosynthesis. We perform self-assembly of zinc protoporphyrin IX (ZnPP) with a truncated CsmA (tCsmA) amphipathic peptide scaffold for the bottom-up construction of a semisynthetic matrix for energy transfer. The resulting self-assembly shows an extended periodic structure with 7(2) helical symmetry. The complex is able to maintain a good photostability for at least 30 min when the concentration is more than 20 μM, and almost 100 % harvested energy can be transferred to the acceptor cation radical methyl viologen (MV(+)). The excitation-energy transfer rate of the complex was increased from the ns(−1) scale to the ps(−1) scale that is comparable to natural light-harvesting antenna systems. It contributes to converging evidence that chiral responsive matrix assemblies can be developed for efficient light energy harvesting in artificial photosynthesis.