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. 2021 Aug 26;22(17):9219. doi: 10.3390/ijms22179219

Figure 3.

Figure 3

Protein structure of the signal-transduction domains of the PFNA operon potentially involved in interaction with the host organism. (A) Comparison of the primary structure of STPK Pkb2 between B. angulatum and B. adolescentis species both belonging to the B. adolescentis phylogroup. Pkb2 contains a catalytic kinase domain, a transmembrane domain (TM), and a C-terminal signal region [23]. (B) Localization of amino acid sites under pervasive positive selection in all branches of the bifidobacterium phylogenetic tree in the primary structure of the WP_038426324.1 protein encoded by the tgm gene in B. longum subsp. longum GT15 genome. The figure shows the domain organization of the protein, as well as the localization of candidate sites with a PP value > 0.7 [23]. Adapted from [23].