Fluorescence Properties of the Isolated Dl/D2/Cytb559 Reaction Centre Complex of Photosystem 2

It now seems clear that the primary charge-separation reaction of Photosystem 2 occurs in a pigment-protein complex comprising the Dl, D2, and Cytb559 polypeptides, and 4–5 Chla, 2 Pheoa, and one molecule of β-carotene [1–4]. In this paper, we describe some results of fluorescence measurements. These provide preliminary information concerning the spatial arrangement of the pigments in this complex.