Volume 86, Issue 5, Pages (May 2004)

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Volume 86, Issue 5, Pages 3121-3130 (May 2004) Electrochromic Shift of Chlorophyll Absorption in Photosystem I from Synechocystis sp. PCC 6803: A Probe of Optical and Dielectric Properties around the Secondary Electron Acceptor Naranbaatar Dashdorj, Wu Xu, Peter Martinsson, Parag R. Chitnis, Sergei Savikhin Biophysical Journal Volume 86, Issue 5, Pages 3121-3130 (May 2004) DOI: 10.1016/S0006-3495(04)74360-X Copyright © 2004 The Biophysical Society Terms and Conditions

Figure 1 (A) (P700+-P700) absorption difference spectra measured for wild-type PS I complexes from the cyanobacterium Synechocystis sp. PCC 6803 at 200ps (solid line) and 3s (dashed line). (B) The single-site A0 and connecting Chl a absorption spectrum in the case when A1 is reduced (solid line) and neutral (dashed line) found by fitting ΔA absorption difference spectra shown in Fig. 1 C in assumption that only these two Chls experience electrochromic shift. (C) The difference between the absorption difference spectra measured at 200ps and at 3s (solid line), and the difference between two single-site Chl a absorption spectra (dashed line) shown in plane (B). Biophysical Journal 2004 86, 3121-3130DOI: (10.1016/S0006-3495(04)74360-X) Copyright © 2004 The Biophysical Society Terms and Conditions

Figure 2 Absorption difference profiles in 5-μs window for PS I core antenna/reaction center complexes excited at 660nm and probed at the indicated wavelengths. Noisy curves are experimental difference profiles; smooth profiles are best fits from global analysis of the four profiles using single-exponential kinetics resulting in optimized lifetime of 300ns. Biophysical Journal 2004 86, 3121-3130DOI: (10.1016/S0006-3495(04)74360-X) Copyright © 2004 The Biophysical Society Terms and Conditions

Figure 3 The A-branch of the reaction center showing connecting chlorophyll, secondary electron acceptor A1, and iron-sulfur complex FX. The positions of NB and ND nitrogens are also shown for connecting Chl a. Biophysical Journal 2004 86, 3121-3130DOI: (10.1016/S0006-3495(04)74360-X) Copyright © 2004 The Biophysical Society Terms and Conditions

Figure 4 (A) The measured electrochromic shift signal (solid line; the same as in Fig. 1 C), and the best fit to the data obtained in a simulation that includes all antenna pigments (γ=0°, Δμ=0.5 D/f, and Δα=1.5Å3/f). (B) Expected electrochromic shift signals in the case of arbitrary spectral distribution of antenna pigments and ɛeff fixed at 5 (short-dashed line), 2 (long-dashed line), and 1 (dash-dotted line). Biophysical Journal 2004 86, 3121-3130DOI: (10.1016/S0006-3495(04)74360-X) Copyright © 2004 The Biophysical Society Terms and Conditions

Figure 5 The structure of the RC in PS I. Large spheres represent water molecules within 10Å of the electron transfer chain. Biophysical Journal 2004 86, 3121-3130DOI: (10.1016/S0006-3495(04)74360-X) Copyright © 2004 The Biophysical Society Terms and Conditions