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Investigation on chlorosomal antenna geometries: tube, lamella and spiral-type self-aggregates

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Abstract

Molecular mechanics calculations and exciton theory have been used to study pigment organization in chlorosomes of green bacteria. Single and double rod, multiple concentric rod, lamella, and Archimedean spiral macrostructures of bacteriochlorophyll c molecules were created and their spectral properties evaluated. The effects of length, width, diameter, and curvature of the macrostructures as well as orientations of monomeric transition dipole moment vectors on the spectral properties of the aggregates were studied. Calculated absorption, linear dichroism, and polarization dependent fluorescence-excitation spectra of the studied long macrostructures were practically identical, but circular dichroism spectra turned out to be very sensitive to geometry and monomeric transition dipole moment orientations of the aggregates. The simulations for long multiple rod and spiral-type macrostructures, observed in recent high-resolution electron microscopy images (Oostergetel et al., FEBS Lett 581:5435–5439, 2007) gave shapes of circular dichroism spectra observed experimentally for chlorosomes. It was shown that the ratio of total circular dichroism intensity to integrated absorption of the Q y transition is a good measure of degree of tubular structures in the chlorosomes. Calculations suggest that the broad Q y line width of chlorosomes of sulfur bacteria could be due to (1) different orientations of the transition moment vectors in multi-walled rod structures or (2) a variety of Bchl-aggregate structures in the chlorosomes.

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Abbreviations

Bchl:

Bacteriochlorophyll

Cb:

Chlorobium

Cf:

Chloroflexus

CD:

Circular dichroism

EM:

Electron microscopy

LD:

Linear dichroism

NMR:

Nuclear magnetic resonance

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  1. Department of Chemistry, University of Jyväskylä, P.O. Box 35, Jyvaskyla, 40014, Finland

    Juha M. Linnanto & Jouko E. I. Korppi-Tommola

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  1. Juha M. Linnanto
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Linnanto, J.M., Korppi-Tommola, J.E.I. Investigation on chlorosomal antenna geometries: tube, lamella and spiral-type self-aggregates. Photosynth Res 96, 227–245 (2008). https://doi.org/10.1007/s11120-008-9304-3

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