Figure 7. Phylogenetic tree of GH1 β-glucosidases in bacteria.

Unrooted tree of 44 protein sequences of GH1 β-glucosidases as inferred by the ML method using the MEGA6⁵⁷ program. Numbers at nodes represent bootstrap values from 1000 replications (shown as percentage and only those higher than 50%). Scale bar indicates estimated number of substitutions per site. Taxonomic classification at the phylum level (Actinobacteria, Firmicutes and Proteobacteria) are indicated, subdividing the Proteobacteria phylum into the two classes represented in the tree (α and γ). Colored circles indicate the classification of each specie as psychrophile/psychrotroph (blue), mesophile (light orange), and thermophile (red) according to literature data (see Table S5). Cyan box indicates the E. antarcticum position in the tree.