Light Harvesting Architectures

Our light harvesting constructs include biohybrid light harvesting complexes which have bacterial photosynthetic antenna peptide analogs carrying designer synthetic chromophores (synthesized by the Lindsey lab at North Carolina State University) that self assemble with each other and native bacteriochlorophyll a to form biohybrid antennas complexes. Using synthetic chromophores allows the complexes to have enhanced solar energy capture compared to their native counterparts. The energy flows from these chromophores to the complex with high efficiency.

Figure 1. (A) ab-dyad subunit of Rs. Molischianum LH2 with indicated sites for chromophore conjugation labeled and α-peptide in blue and β-peptide ii green.  The His (black) that binds BChl a (purple) is position 0.  (B) Top view of the full LH2 antenna showing peptides with attachment sites.  (C) Model of LH1.

Figure 2.  Schematic of energy transfer from an synthetic bacteriochlorin (appended to the -14 position of the beta peptide)  to the bacteriochlorophyll trap site within a dyad.  Multiple (likely 14-16) such dyads form the cyclic oligomer shown in Figure 1C.