Structural highlights 
  Function 
[CEA3_ECOLX] Inactivates ribosomes by hydrolyzing 16S RNA in 30S ribosomes at a specific site.  Colicins are polypeptide toxins produced by and active against E.coli and closely related bacteria. [IMM3_ECOLX] This protein inhibits the 16S RNA hydrolyzing activity of colicin E3 by binding with high affinity to the C-terminal catalytic domain of E3. This protein is able to protect a cell, which harbors the plasmid ColE3 against colicin E3. 
  Evolutionary Conservation 
Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.