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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Niedzwiedzki, Dariusz M. Holten, Dewey Blankenship, Robert E. Honkanen, Suvi Picken, Nichola Cogdell, Richard J. Bina, David |
| Description | Author Affiliation: Niedzwiedzki DM ( Photosynthetic Antenna Research Center, Washington University, St Louis, MO, USA. niedzwiedzki@wustl.edu) |
| Abstract | Two spectral forms of the peripheral light-harvesting complex (LH2) from the purple sulfur photosynthetic bacterium Allochromatium vinosum were purified and their photophysical properties characterized. The complexes contain bacteriochlorophyll a (BChl a ) and multiple species of carotenoids. The composition of carotenoids depends on the light conditions applied during growth of the cultures. In addition, LH2 grown under high light has a noticeable split of the B800 absorption band. The influence of the change of carotenoid distribution as well as the spectral change of the excitonic absorption of the bacteriochlorophylls on the light-harvesting ability was studied using steady-state absorption, fluorescence and femtosecond time-resolved absorption at 77 K. The results demonstrate that the change of the distribution of the carotenoids when cells were grown at low light adapts the absorptive properties of the complex to the light conditions and maintains maximum photon-capture performance. In addition, an explanation for the origin of the enigmatic split of the B800 absorption band is provided. This spectral splitting is also observed in LH2 complexes from other photosynthetic sulfur purple bacterial species. According to results obtained from transient absorption spectroscopy, the B800 band split originates from two spectral forms of the associated BChl a monomeric molecules bound within the same complex. |
| ISSN | 00063002 |
| Journal | Biochimica et Biophysica Acta (BBA) - Reviews on Cancer |
| Issue Number | 9 |
| Volume Number | 1817 |
| Language | English |
| Publisher | Elsevier |
| Publisher Date | 2012-09-01 |
| Publisher Place | Netherlands |
| Access Restriction | Open |
| Subject Keyword | Bacterial Proteins Chemistry Carotenoids Chromatiaceae Metabolism Light-Harvesting Protein Complexes Photosynthesis Spectrum Analysis Research Support, Non-U.S. Gov't Biochemistry |
| Content Type | Text |
| Resource Type | Article |
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