Fig. 5: Pc binding site.
From: Algal photosystem I dimer and high-resolution model of PSI-plastocyanin complex
a, Pc binding in C. reinhardtii (current work). The positively charged residues of PsaF stabilize the interactions. The corresponding Pc region that deviates from the plant counterpart is cyan. b, Pc binding in plants29. The two inserted residues are magenta. c, Ninety-degree rotated view with Pc surface shown with Coulomb potential from the interface. d, The same view for a plant counterpart (PDB ID: 6ZOO), illustrating that the acidic patch is shifted. e, Multiple sequence alignment of Pc from different species of the green lineage (algae and plants) showing that the inserted residues 58 and 59 occur in a subset of plants and do not represent a general case.
