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Resonance Raman spectra of chlorophyll a and β-carotene moieties have been observed from a photosystem II reaction-center complex containing the D-1 and D-2 polypeptides and cytochrome b-559. Examination of the CC double-bond and the keto CO stretching regions of chlorophyll a moiety has indicated that the Mg atom is five-coordinate and the keto CO is hydrogen-bonded. The resonance Raman spectrum of β-carotene moiety has suggested that this carotenoid molecule takes the all-trans form. This suggestion has been supported by an HPLC analysis of the extracted carotenoid.
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Fujiwara et al. (1987) studied this question.
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