Fig. 5

Phylogeny of S. maltophilia genomes associated with colistin-degrading proteases. a A genome-based phylogenetic tree was reconstructed by the maximum likelihood method using the concatenated alignments of 1073 core genes among S. maltophilia genomes. S. rhizophila was used as an outgroup. Shaded colors on strain names indicate amino acid sequence identity compared to that of the Cdp of strain Col1. Colors in the inner circle indicate the isolation source of strains: human (blue), environment (brown), animal (pink), plant (green), and unknown (gray). Colors in the outer circle indicate the different sources of human specimens: respiratory tract (cyan), blood and bodily fluid (red), skin (orange), minor specimen (purple), and unknown (gray). Strains tested for colistin-degrading activity are marked with numbers. b Characteristics of S. maltophilia strains tested for colistin-degrading activity