Abstract
Biohybrid antennas built upon chromophore–polypeptide conjugates show promise for the design of efficient light-capturing modules for specific purposes. Three new designs, each of which employs analogs of the β-polypeptide from Rhodobacter sphaeroides, have been investigated. In the first design, amino acids at seven different positions on the polypeptide were individually substituted with cysteine, to which a synthetic chromophore (bacteriochlorin or Oregon Green) was covalently attached. The polypeptide positions are at –2, –6, –10, –14, –17, –21, and –34 relative to the 0-position of the histidine that coordinates bacteriochlorophyll a (BChl a). All chromophore–polypeptides readily formed LH1-type complexes upon combination with the α-polypeptide and BChl a. Efficient energy transfer occurs from the attached chromophore to the circular array of 875 nm absorbing BChl a molecules (denoted B875). In the second design, use of two attachment sites (positions –10 and –21) on the polypeptide affords (1) double the density of chromophores per polypeptide and (2) a highly efficient energy-transfer relay from the chromophore at –21 to that at –10 and on to B875. In the third design, three spectrally distinct bacteriochlorin–polypeptides were prepared (each attached to cysteine at the –14 position) and combined in an ~1:1:1 mixture to form a heterogeneous mixture of LH1-type complexes with increased solar coverage and nearly quantitative energy transfer from each bacteriochlorin to B875. Collectively, the results illustrate the great latitude of the biohybrid approach for the design of diverse light-harvesting systems.
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Abbreviations
- BChl a :
-
Bacteriochlorophyll a
- HFA:
-
Hexafluoroacetone trihydrate
- NIR:
-
Near infrared
- OGR:
-
Oregon Green
- PGly:
-
Propargyl glycine
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Acknowledgments
This research was carried out as part of the Photosynthetic Antenna Research Center (PARC), an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences under Award Number DE-SC0001035. The authors thank Dr. Klaus Schulten for providing the structural coordinates for the LH1-model used in Fig. 1b, c and Dr. Neil Hunter for Rb. sphaeroides puc 705BA.
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Harris, M.A., Jiang, J., Niedzwiedzki, D.M. et al. Versatile design of biohybrid light-harvesting architectures to tune location, density, and spectral coverage of attached synthetic chromophores for enhanced energy capture. Photosynth Res 121, 35–48 (2014). https://doi.org/10.1007/s11120-014-9993-8
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DOI: https://doi.org/10.1007/s11120-014-9993-8