Volume 99, Issue 6, Pages (September 2010)

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Volume 99, Issue 6, Pages 1754-1763 (September 2010) Cytochrome c-Lipid Interactions: New Insights from Resonance Energy Transfer Valeriya M. Trusova, Galyna P. Gorbenko, Julian G. Molotkovsky, Paavo K.J. Kinnunen Biophysical Journal Volume 99, Issue 6, Pages 1754-1763 (September 2010) DOI: 10.1016/j.bpj.2010.06.017 Copyright © 2010 Biophysical Society Terms and Conditions

Figure 1 Comparison of AV-PC and AV-CL energy transfer profiles obtained for PC/CL liposomes containing 2.5 (A), 5 (B), 10 (C), or 20 (D) mol % CL under conditions of low ionic strength (20 mM). Lipid concentration was 20 μM. Solid lines are to guide the reader's eye. Biophysical Journal 2010 99, 1754-1763DOI: (10.1016/j.bpj.2010.06.017) Copyright © 2010 Biophysical Society Terms and Conditions

Figure 2 Effect of lipid concentration on RET in CLAV-CL model membranes: (A) 2.5 mol % CL, (B) 20 mol % CL. Ionic strength was 20 mM. Solid lines are to guide the reader's eye. Biophysical Journal 2010 99, 1754-1763DOI: (10.1016/j.bpj.2010.06.017) Copyright © 2010 Biophysical Society Terms and Conditions

Figure 3 Relative quantum yield of AV-PC (A) and AV-CL (B) in PC/CL (10 mol %) liposomes under conditions of varying ionic strength. Lipid concentration is 20 μM. Solid lines are to guide the reader's eye. Biophysical Journal 2010 99, 1754-1763DOI: (10.1016/j.bpj.2010.06.017) Copyright © 2010 Biophysical Society Terms and Conditions

Figure 4 Difference between AV-PC and AV-CL relative quantum yields calculated as a function of total protein concentration for PC/CL model membranes containing 2.5 (A) or 20 (B) mol % CL. Lipid concentration is 20 μM. Solid lines are to guide the reader's eye. Biophysical Journal 2010 99, 1754-1763DOI: (10.1016/j.bpj.2010.06.017) Copyright © 2010 Biophysical Society Terms and Conditions

Figure 5 MC calculations of AV-CL relative quantum yield for the cases of the basic lipid demixing model (dash-dot-dotted line), the basic demixing model allowing for complete protein binding (Case I, dash-dotted line), cyt c location in the lipid bilayer center (Case II, dotted line), and aggregation of membrane-bound protein (Case III, dashed line). The experimental curve was obtained for PC/CL (2.5 mol % CL) liposomes at ionic strength 40 mM with donor AV-CL. Biophysical Journal 2010 99, 1754-1763DOI: (10.1016/j.bpj.2010.06.017) Copyright © 2010 Biophysical Society Terms and Conditions

Figure 6 Membrane domain characteristics recovered from the combined lipid demixing + extended lipid anchorage MC model for CL10 (squares) and CL20 (circles) systems at ionic strength 40 (upper) and 60 mM (lower). Biophysical Journal 2010 99, 1754-1763DOI: (10.1016/j.bpj.2010.06.017) Copyright © 2010 Biophysical Society Terms and Conditions