Fig. 4
From: Evolutionary and functional analysis of mulberry type III polyketide synthases
Conserved amino acid sites on a three-dimensional model of a typical STS enzyme. a Three dimensional STS dimer structure indicating the conserved amino acid sites. Positive selection and type II divergence sites are shown in purple (numbering is based on MnSTS). Catalytic triads are shown in gold (numbering is based on Medicago sativa CHS). b Evolutionarily conserved residues in the STS enzyme. All sites are labeled according to their conservation scale. The asterisk indicates the site that experienced positive selection pressure. The remaining six sites underwent positive selection and type II divergence