Fig. 3: CO2 alters pairwise chromophore interactions in allophycocyanin trimers from Thermosynechococcus vulcanus.
From: Allophycocyanin A is a carbon dioxide receptor in the cyanobacterial phycobilisome
a Ribbon diagram of the ApcAB (αβ)3 trimer demonstrating the monomeric and interface chromophore-binding pockets. ApcA is shown in red and ApcB in blue. b K6 forms a salt bridge with D100. D100 is sited on an α-helix that connects to the chromophore-binding pocket. c Plot of the frequency of distance against inter-chromophore distance for three monomer-interface chromophore pairs in the apo state. d Plot of the frequency of distance against inter-chromophore distance for three monomer-interface chromophore pairs in the CO2-bound state. Source data are provided as a Source Data file.
