What does it mean when PDB lists multiple organisms for the same structure?
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.