Aggregation of chlorophyll b in model systems

Fra̧ckowiak, D.; Goc, J.; Malak, Henryk; Planner, A.; Ptak, Arkadiusz; Zelent, Bogumił

doi:10.1016/1010-6030(95)04201-6

Cited by 9 publications

(2 citation statements)

References 32 publications

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“…Indeed, early work by Oksanen et al (50) and Fra -ckowiak et al (51) showed that Chl b exhibited a similar enhancement of the Q y band upon self-aggregation. The absorption spectrum of the water-soluble chlorophyll-binding protein reconstituted with Chl b alone reported by Theiss et al (52) showed a slightly enhanced Q y transition.…”

Section: Discussionmentioning

confidence: 94%

“…It is noteworthy here that Chl b, which is abundant in plants, has a molar extinction coefficient similar to that of BChl e. Thus, it is likely that the absorption spectrum of Chl b is also significantly affected by the intensity borrowing effect when it is included in a densely packed pigment-protein complex, such as light-harvesting chlorophyll-protein complexes (LHCs). Indeed, early work by Oksanen et al (50) and Fra -ckowiak et al (51) showed that Chl b exhibited a similar enhancement of the Q y band upon self-aggregation. The absorption spectrum of the water-soluble chlorophyll-binding protein reconstituted with Chl b alone reported by Theiss et al (52) showed a slightly enhanced Q y transition.…”

Section: Discussionmentioning

confidence: 99%

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Intensity Borrowing via Excitonic Couplings among Soret and Q_y Transitions of Bacteriochlorophylls in the Pigment Aggregates of Chlorosomes, the Light-Harvesting Antennae of Green Sulfur Bacteria

et al. 2010

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Model calculations of linear dichroism (LD) and circular dichroism (CD) spectra were conducted for the chlorosomes of green sulfur bacteria, Chlorobium phaeobacteroides and Chlorobium tepidum, on the basis of the theory of delocalized exciton. The chlorosomes of Chl. phaeobacteroides and Chl. tepidum contain bacteriochlorophylls (BChls) e and c as the major light-harvesting pigments, respectively. The excitonic couplings among the Soret and Q(y) transitions were considered on the basis of the "rodlike" structural model for the pigment self-aggregates in a chlorosome. Trial simulations were conducted by assuming the B(x) and B(y) transition-dipole vectors to be parallel to the molecular x- and y-axes, respectively. The simulation at this stage could nicely reproduce the larger splitting of the Soret band and more significant enhancement of the Q(y) band upon formation of chlorosome in the BChl e-containing chlorosome than in the BChl c-containing one. Intensity borrowing was indicated to be the key mechanism inducing the enhancement of the Q(y) band in the BChl e-containing chlorosomes. However, the simulated LD and CD spectra in the Soret region showed qualitative disagreement from the observed ones. To resolve the deviations, the directions of the B(x) and B(y) transition-dipole vectors and the orientations of the molecular planes of BChls were adjusted in the next stage. The fine-tuning of these parameters resulted in a striking agreement between the observed and simulated CD and LD spectra over the whole spectral range studied. The best fit was obtained when the B(x) and B(y) transition-dipole vectors were assumed to be rotated 25 degrees clockwise from the molecular x- and y-axes and the molecular planes in the pigment aggregate were tilted 5 degrees from that assumed in the original model without alteration in the direction of the molecular y-axis. The calculated spectral profiles were affected little by the change in the curvatures of the rod surface, showing that the optical spectra of chlorosomes were determined essentially by the local pigment arrangement, but not by the higher-order structure, of the aggregate.

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Section: Discussionmentioning

confidence: 94%

Section: Discussionmentioning

confidence: 99%

Intensity Borrowing via Excitonic Couplings among Soret and Q_y Transitions of Bacteriochlorophylls in the Pigment Aggregates of Chlorosomes, the Light-Harvesting Antennae of Green Sulfur Bacteria

et al. 2010

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Fluorescence Spectroscopy in Optoelectronics, Photomedicine, and Investigation of Biomolecular Systems

Wróbel

Dudkowiak

Goc

2009

Reviews in Fluorescence 2008

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Luminescence and energy transfer from açai oil in polystyrene matrix

et al. 2010

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Aggregation of chlorophyll b in model systems

Cited by 9 publications

References 32 publications

Intensity Borrowing via Excitonic Couplings among Soret and Q_y Transitions of Bacteriochlorophylls in the Pigment Aggregates of Chlorosomes, the Light-Harvesting Antennae of Green Sulfur Bacteria

Intensity Borrowing via Excitonic Couplings among Soret and Q_y Transitions of Bacteriochlorophylls in the Pigment Aggregates of Chlorosomes, the Light-Harvesting Antennae of Green Sulfur Bacteria

Fluorescence Spectroscopy in Optoelectronics, Photomedicine, and Investigation of Biomolecular Systems

Luminescence and energy transfer from açai oil in polystyrene matrix

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Aggregation of chlorophyll b in model systems

Cited by 9 publications

References 32 publications

Intensity Borrowing via Excitonic Couplings among Soret and Qy Transitions of Bacteriochlorophylls in the Pigment Aggregates of Chlorosomes, the Light-Harvesting Antennae of Green Sulfur Bacteria

Intensity Borrowing via Excitonic Couplings among Soret and Qy Transitions of Bacteriochlorophylls in the Pigment Aggregates of Chlorosomes, the Light-Harvesting Antennae of Green Sulfur Bacteria

Fluorescence Spectroscopy in Optoelectronics, Photomedicine, and Investigation of Biomolecular Systems

Luminescence and energy transfer from açai oil in polystyrene matrix

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Product

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Intensity Borrowing via Excitonic Couplings among Soret and Q_y Transitions of Bacteriochlorophylls in the Pigment Aggregates of Chlorosomes, the Light-Harvesting Antennae of Green Sulfur Bacteria

Intensity Borrowing via Excitonic Couplings among Soret and Q_y Transitions of Bacteriochlorophylls in the Pigment Aggregates of Chlorosomes, the Light-Harvesting Antennae of Green Sulfur Bacteria