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Fig. 4 | BMC Plant Biology

Fig. 4

From: Parallel subfunctionalisation of PsbO protein isoforms in angiosperms revealed by phylogenetic analysis and mapping of sequence variability onto protein structure

Fig. 4

Mapping variable amino acid residues on the PsbO structure. a Differences between isoforms in Solanaceae species and (b) differences between isoforms averaged across all angiosperm families. The varying positions are green-coloured depending on frequency of differences among the analysed pairs of isoforms. c Merged differences between isoforms (in green) and between species (in red) with equally coloured spheres indicating spatial centres of these differences calculated separately for each angiosperm family, the frequency of particular differences on each position is indicated by colour gradient. d Merged averaged differences between isoforms (in green), between plant families (in blue) or both types (in cyan); only positions with a value of variability above a given threshold (0.24) are shown together with overall spatial centres of differences between isoforms, species (within families) and families (green, red and blue spheres, respectively). The homology model of the Solanum tuberosum PsbO2 based on the X-ray structure of cyanobacterial PsbO [PDB:3ARC] [5] was constructed using Swiss-Model program [38]; the first 13 N-terminal amino acids were not present in the template structure, so they were pasted in the model without attempts to show any folding and they were not included in calculation of the spatial centres

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