Abstract
Single molecule spectroscopy was applied to study the optical properties of native and refolded peridinin–chlorophyll–protein (PCP) complexes. The native system is a trimer with six chlorophyll a (Chl a) molecules, while the refolded one contains two Chl a and resembles structurally and spectroscopically the PCP monomer. The fluorescence emission of single PCP complexes strongly broadens with increasing excitation power. Simultaneously, the distribution of fluorescence maximum frequencies is also broadened. These spectral changes are attributed to photoinduced conformational changes of the protein that influence the fluorescence of embedded chromophores. Comparison of fluorescence intensities measured for PCP complexes in two different solvents indicates that the native PCP trimers are preserved in EDTA Tris buffer, while in PVA polymer matrix only monomers are stable.
Similar content being viewed by others
References
Frauenfelder H (2003) Complexity of proteins. In: Physics of biological systems: from molecules to species. Springer, Heidelberg, Germany
Polivka T, Sundström V (2004) Ultrafast dynamics of carotenoid excited states—from solution to natural and artificial system. Chem Rev 104:2021–2071
Moerner WE (2002) A dozen years of single-molecule spectroscopy in physics, chemistry, and biophysics. J Phys Chem B 106:910–927
Hofmann C, Aartsma TJ, Michel H, Köhler J (2003) Direct observation of tiers in the energy landscape of a chromoprotein: a single-molecule study. Proc Natl Acad Sci U S A 100:15534–15538
Rutkauskas D, Novoderezhkin V, Cogdell RJ, van Grondelle R (2005) Fluorescence spectroscopy of conformational changes of single LH2 complexes. Biophys J 88:422–435
Valkunas L, Janusonisa J, Rutkauskas D, van Grondelle R (2007) Protein dynamics revealed in the excitonic spectra of single LH2 complexes. J Lumin 127:269–275
Hofmann E, Wrench PM, Sharples FP, Hiller RG, Welte W, Diederichs K (1996) Structural basis of light harvesting by carotenoids: peridinin chlorophyll-a protein from Amphidinium carterae. Science 272:788–1791
Kleima FJ, Wendling M, Hofmann E, Peterman EJ, van Grondelle R, van Amerongen H (2000) Peridinin chlorophyll a protein: relating structure and steady-state spectroscopy. Biochemistry 39:5184–5195
Wörmke S, Mackowski S, Brotosudarmo THP, Bräuchle C, Garcia A, Braun P, Scheer H, Hofmann E (2007) Detection of single biomolecule fluorescence excited through energy transfer: application to light-harvesting complexes. Appl Phys Lett 90:193901
Wörmke S, Mackowski S, Brotosudarmo THP, Jung C, Zumbusch A, Ehrl M, Scheer H, Hofmann E, Hiller RG, Bräuchle C (2007) Monitoring fluorescence of individual chromophores in peridinin–chlorophyll–protein complex using single molecule spectroscopy. Biochim Biophys Acta 1767:956–964
Kleima FJ, Hofmann E, Gobets B, Van Stokkum IHM, van Grondelle R, Diederich K, van Amerongen H (2000) Förster excitation energy transfer in peridinin–chlorophyll a–protein. Biophys J 78:344–353
Miller DJ, Catmull J, Puskeiler R, Tweedale H, Sharples FP, Hiller RG (2005) Reconstitution of the peridinin–chlorophyll a protein (PCP): evidence for functional flexibility in chlorophyll binding. Photosynth Res 86:229–240
Brotosudarmo THP, Hofmann E, Hiller RG, Wörmke S, Mackowski S, Zumbusch A, Bräuchle C, Scheer H (2006) Peridinin–chlorophyll–protein reconstituted with chlorophyll mixtures: preparation, bulk and single molecule spectroscopy. FEBS Lett 580:5257–5262
Mackowski S, Wörmke S, Brotosudarmo THP, Jung C, Hiller RG, Scheer H, Bräuchle C (2007) Energy transfer in reconstituted peridinin–chlorophyll–protein complexes: ensemble and single molecule spectroscopy studies. Biophys J 93:3249–3258
Polívka T, Pascher T, Sundström V, Hiller RG (2005) Tuning energy transfer in the peridinin–chlorophyll complex by reconstitution with different chlorophylls. Photosynth Res 86:217–227
Mackowski S, Wörmke S, Brotosudarmo THP, Scheer H, Bräuchle C (2008) Fluorescence spectroscopy of reconstituted peridinin–chlorophyll–protein complexes. Photosynth Res 95:253–260
Law CJ, Cogdell RJ (1998) The effect of chemical oxidation on the fluorescence of the LH1 (B880) complex from the purple bacterium Rhodobium marimum. FEBS Lett 432:27–30
Spezia R, Aschi M, Nola AD, Valentin MD, Carbonera D, Amadei A (2003) The effect of protein conformational flexibility on the electronic properties of a chromophore. Biophys J 84:2805–2813
Acknowledgment
The authors thank Eckhard Hofmann for many fruitful discussions. The work was supported by the Deutsche Forschungsgemeinschaft, Bonn (SFB 533, projects A6 and B7) and “Center for Integrated Protein Science Munich (CiPSM)”. S. M. acknowledges financial support from the Alexander von Humboldt Foundation.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Wörmke, S., Mackowski, S., Schaller, A. et al. Single Molecule Fluorescence of Native and Refolded Peridinin–Chlorophyll–Protein Complexes. J Fluoresc 18, 611–617 (2008). https://doi.org/10.1007/s10895-008-0310-9
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s10895-008-0310-9