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Investigation of the effects of different carotenoids on the absorption and CD signals of light harvesting 1 complexes

Georgakopoulou, S. and van der Zwan, G. and Olsen, J. D. and Hunter, C. N. and Niederman, R. A. and van Grondelle, R.. (2006) Investigation of the effects of different carotenoids on the absorption and CD signals of light harvesting 1 complexes. The journal of physical chemistry. B, Condensed matter, materials, surfaces, interfaces & biophysical chemistry, Vol. 110, H. 7. pp. 3354-3361.

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Official URL: http://edoc.unibas.ch/dok/A5249171

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Abstract

Absorption and circular dichroism (CD) spectra of light-harvesting (LH)1 complexes from the purple bacteria Rhodobacter (Rba.) sphaeroides and Rhodospirillum (Rsp.) rubrum are presented. The complexes exhibit very low intensity, highly nonconservative, near-infrared (NIR) CD spectra. Absorption and CD spectra from several mutant and reconstituted LH I complexes, with the carotenoid neurosporene and the precursor phytoene replacing the wild-type (WT) carotenoids, are also examined. The experiments show that the position of the carotenoid bands as well as the bacteriochlorophyll (BChl)/carotenoid ratio affect the NIR CD spectra: bluer bands and larger ratios make the NIR CD signal more conservative. Modeling results that support this finding are presented. This study, combined with the theoretical approach of the companion paper, where modeling of such complexes is presented and discussed in detail, provide a complete explanation of the origin of the nonconservative NIR CD spectra of LH1 and B820.
Faculties and Departments:05 Faculty of Science > Departement Biozentrum > Former Organization Units Biozentrum > Structural Biology (Aebi)
UniBasel Contributors:Georgakopoulou, Sofia
Item Type:Article, refereed
Article Subtype:Research Article
Bibsysno:Link to catalogue
Publisher:American Chemical Society
ISSN:1089-5647
Note:Publication type according to Uni Basel Research Database: Journal article
Identification Number:
Last Modified:11 Oct 2012 15:15
Deposited On:22 Mar 2012 13:16

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