Figure 4

Model of the association of Chl with Lhcb1. The arrangement of the protein in thylakoid membranes is illustrated according to ref. 50. The "core" Chls (a1,a2,a4 anda5) are shown as Chla交流cording to ref. [35]. The green color marks positions of Chlbas proposed in the text. Sitesa3 andb3, although mixed in occupancy after reconstitution [35], were assigned as shown based on ligand strength. At least four of the five Chlbmolecules are coordinated directly to the protein. The biological requirement of Chlbfor accumulation of Lhcb1 (see text) suggests an alternate assignment fora4, as also proposed in ref. [34].