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Kang B, Yang W, Lee S, Mukherjee S, Forstater J, Kim H, Goh B, Kim TY, Voelz VA, Pang Y, Seo J
Precisely tuneable energy transfer system using peptoid helix-based molecular scaffold
Sci Rep (2017) 7:4786.
Abstract
The energy flow during natural photosynthesis is controlled by maintaining the spatial arrangement of pigments, employing helices as scaffolds. In this study, we have developed porphyrin-peptoid (pigment-helix) conjugates (PPCs) that can modulate the donor-acceptor energy transfer efficiency with exceptional precision by controlling the relative distance and orientation of the two pigments. Five donor-acceptor molecular dyads were constructed using zinc porphyrin and free base porphyrin (Zn(i + 2)-Zn(i + 6)), and highly efficient energy transfer was demonstrated with estimated efficiencies ranging from 92% to 96% measured by static fluorescence emission in CH2Cl2 and from 96.3% to 97.6% using femtosecond transient absorption measurements in toluene, depending on the relative spatial arrangement of the donor-acceptor pairs. Our results suggest that the remarkable precision and tunability exhibited by nature can be achieved by mimicking the design principles of natural photosynthetic proteins.
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Publication Date: 2017-07-06.
PMCID: PMC5500559
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Last updated on Wednesday, September 06, 2017