I'm browsing through ribosomes which have been modeled with Cryoem on PDB and am pretty confused by the fact that for some, PDB, or rather the authors of the deposition probably, put multiple organisms from different domains of life... How does one interpret that?
Since this is a 40S ribosomal protein, and therefore eukaryotic-specific (as the description says) the listing of E. coli is not intuitive as you note. If you go down to "Macromolecules" and click on "Nucleic Acids/Hybrids" you can see the listed E. coli sequence is just 28bp, and all
Us (poly(U) tail?). So, you can safely ignore the bacterial annotation I think.