Absorption and CD spectroscopy and modeling of various LH2 complexes from purple bacteria
JournalArticle (Originalarbeit in einer wissenschaftlichen Zeitschrift)
ID 56771
Author(s) Georgakopoulou, Sofia; Frese, Raoul N; Johnson, Evelyn; Koolhaas, Corline; Cogdell, Richard J; van Grondelle, Rienk; van der Zwan, Gert
Author(s) at UniBasel Georgakopoulou, Sofia
Year 2002
Title Absorption and CD spectroscopy and modeling of various LH2 complexes from purple bacteria
Journal Biophysical journal
Volume 82
Number 4
Pages / Article-Number 2184-97
Keywords light-harvesting complex; rhodopseudomonas-acidophila strain-10050; 3 photosynthetic complexes; rhodobacter-sphaeroides; antenna complex; circular-dichroism; energy-transfer; exciton delocalization; electronic excitation; pigment interactions
Abstract The absorption (OD) and circular dichroism (CD) spectra of LH2 complexes from various purple bacteria have been measured and modeled. Based on the lineshapes of the spectra we can sort the LH2 complexes into two distinguishable groups: "acidophila"-Iike (type 1) and "molischianum"-like (type 2). Starting from the known geometric structures of Rhodopseudomonas (Rps.) acidophila and Rhodospirillum (Rsp,) molischianum we can model the OD and CID spectra of all species by just slightly varying some key parameters: the interaction strength, the energy difference of alpha- and beta-bound B850 bacteriochlorophylls (BChls), the orientation of the B800 and B850 BChls, and the (in)homogeneous broadening. Although the ring size can vary, the data are consistent with all the LH2 complexes having basically very similar structures.
Publisher Biophysical Society
ISSN/ISBN 0006-3495
edoc-URL http://edoc.unibas.ch/dok/A5249167
Full Text on edoc No
Digital Object Identifier DOI 10.1016/S0006-3495(02)75565-3
PubMed ID http://www.ncbi.nlm.nih.gov/pubmed/11916874
ISI-Number WOS:000174932400045
Document type (ISI) Journal Article

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