Fig. 6: Reduced number of CLA and carotenoids in the PSI core and structural changes in the FCP antenna. | Nature Communications

Fig. 6: Reduced number of CLA and carotenoids in the PSI core and structural changes in the FCP antenna.

From: The cryo-EM structure of Photosystem I from Chromera velia with a bound superoxide dismutase heterodimer

Fig. 6

a Lost CLA in C. velia PSI core compared to the diatom structure with PDB_ID: 6L4U. Missing CLAs in C. velia compared to 6L4U are shown in gray, all CLAs present in C. velia in green, and conserved CLAs shared between 6L4U and C. velia in orange. Shifted CLA binding sites are indicated by arrows. All conserved CLA binding sites in C. velia are labeled. b Comparison of CLA binding sites in Symbiodinium (yellow) and C. velia (green), with four clusters of decreased CLA sites in orange. Lost CLA sites in Symbiodinium are labeled (PDB_ID: 8JJR). Absent and present FCPs are indicated. c Comparison of carotenoids in Symbiodinium (purple) and C. velia (blue) PSI core. Lost carotenoids are in turquoise, new ones in pink. Carotenoids are labeled by type and subunit, with arrows indicating the shifts of carotenoid binding sites. d C. velia FCP antenna compared to Symbiodinium shows steric clashes (red star) and a ~ 45 Å shift of FCPa and FCPc, resulting in a widened gap (black arrow). e Close-up view of all five FCP antennae. Transmembrane helices are labeled, pigments numbered according to the PDB file of the current work.

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