Macrocycle ring deformation as the secondary design principle for light-harvesting complexes

De Vico, L, Anda, A, Osipov, V, Madsen, A and Hansen, T 2018, 'Macrocycle ring deformation as the secondary design principle for light-harvesting complexes', Proceedings of the National Academy of Sciences of the United States of America, vol. 115, no. 39, pp. 1-7.


Document type: Journal Article
Collection: Journal Articles

Title Macrocycle ring deformation as the secondary design principle for light-harvesting complexes
Author(s) De Vico, L
Anda, A
Osipov, V
Madsen, A
Hansen, T
Year 2018
Journal name Proceedings of the National Academy of Sciences of the United States of America
Volume number 115
Issue number 39
Start page 1
End page 7
Total pages 7
Publisher National Academy of Sciences
Abstract Natural light-harvesting is performed by pigmentprotein complexes, which collect and funnel the solar energy at the start of photosynthesis. The identity and arrangement of pigments largely define the absorption spectrum of the antenna complex, which is further regulated by a palette of structural factors. Small alterations are induced by pigmentprotein interactions. In light-harvesting systems 2 and 3 from Rhodoblastus acidophilus, the pigments are arranged identically, yet the former has an absorption peak at 850 nm that is blue-shifted to 820 nm in the latter. While the shift has previously been attributed to the removal of hydrogen bonds, which brings changes in the acetyl moiety of the bacteriochlorophyll, recent work has shown that other mechanisms are also present. Using computational and modeling tools on the corresponding crystal structures, we reach a different conclusion: The most critical factor for the shift is the curvature of the macrocycle ring. The bending of the planar part of the pigment is identified as the second-most important design principle for the function of pigmentprotein complexesa finding that can inspire the design of novel artificial systems.
Subject Renewable Power and Energy Systems Engineering (excl. Solar Cells)
Keyword(s) Bacteriochlorophyll
Chromophore mimics
LH3
Macrocycle ring deformation
MS-RASPT2
DOI - identifier 10.1073/pnas.1719355115
Copyright notice © 2018 National Academy of Sciences
ISSN 0027-8424
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