Fig. 8: The main region of disorder in monomerized PSI and the putative site of lost red chlorophylls. | Communications Biology

Fig. 8: The main region of disorder in monomerized PSI and the putative site of lost red chlorophylls.

From: Cryo-EM structure of a functional monomeric Photosystem I from Thermosynechococcus elongatus reveals red chlorophyll cluster

Fig. 8

The monomer model 6LU1 is depicted in gray as surface for protein and as ball and stick for ligands. Ligands and protein regions of the trimer structure model 1JB0 that could not be modeled in our monomer structure in red ribbon or ball and stick. ① Weak coordination of the lost chlorophyll B1219 of the trimer structure. ② Interaction between the lost lipid IV of the trimer structure and the loop-helix-loop motif B291–B316 of PsaB (disordered in the monomer structure) and the lost PsaX subunit. ③ Weak coordination of the lost chlorophyll B1233 of the lumenal side trimer staircase chlorophylls.

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