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Gaussian decomposition of absorption and linear dichroism spectra of outer antenna complexes of photosystem II.

Room temperature and 10 K absorption and linear dichroism spectra of the chlorophyll-protein complexes comprising the outer antenna of PSII (LHCII, CP29, CP26, CP24) have been analyzed in terms of a linear combination of asymmetric Gaussian bands. The results demonstrate the following: (a) The absorption and linear dichroism spectra of each sample can be described by nearly the same set of Gaussian bands at room temperature and 10 K. (b) The relative distributions of the transition moments of the major red-absorbing spectral forms seem to be similar in all four outer antenna chlorophyll-protein complexes at room temperature, with the 684-nm band being oriented closest to the particle plane at room temperature and the 677- and 669-nm bands being tilted at progressively greater angles out of the particle plane. The shorter wavelength transitions seem to be oriented close to the magic angle, but interpretation is complicated in this spectral region due to the low linear dichroism values and by overlap with vibrational bands. (c) The 684-nm band, detected in room temperature absorption and linear dichroism spectra of all complexes, vanishes at 10 K.