Figure legends
Figure 1. Pie charts showing the distribution of bacterial S1 proteins, a in the number of structural S1 domains, bS1 protein phylum-level sequences distribution, c phylogenetic distribution of bacterial genome projects in progress of 2020 (https://gold.jgi.doe.gov/statistics)
Figure 2. (a) PID analysis of four-domain containing S1 proteins for bacterial phyla. (b) PID analysis for five-domain containing S1 proteins within phylum Deinococcus-Thermus. (c) UniProt ID and amino acid sequence for the five-domain containing S1 protein from Thermus thermophilus .
Figure 3 . (a, b) Logo motif representation for S1 proteins, containing two domains. The conserved residues F14, F17, R66 in the first domain and F17 and H29 in the second domain correspond to the RNA binding site. (c,d) Images of the Logo motif for the third and fourth domains of S1 proteins containing six domains. The conserved residues F17, L20, H34, N68 and R70 correspond to the RNA binding site. Logo profiles are generated by the WebLogo 3 server. The positions are given taking into account the shift due to the termini of the structural domains.
Figure 4. Schematic representative of the bacterial phyla, containing different number of structural S1 domains.