Colicin E3

UniProtKB accession:  P00646

Grouped By:  Matching UniProtKB accession

UniProtKB description:  Colicins are polypeptide toxins produced by and active against E.coli and closely related bacteria (PubMed:3889348, PubMed:4930243, PubMed:4930244, PubMed:6295812). Cleaves 16S rRNA between adenosine-1492 and guanosine-1493 (E.coli 16S rRNA numbering), releasing a 49 nucleotide (nt) 'colicin' fragment (PubMed:20852642). Inactivates 70S ribosomes or 30S subunits by endonucleolytically cleaving 16S RNA at a specific site about 50 nt from its C-terminus (PubMed:4930243, PubMed:4930244, PubMed:782524). Produces 5'-OH-guanosine and a 2',3'-cyclic phosphate adenosine (PubMed:20852642, PubMed:4930244). Mixing a susceptible (e.g. strain K12 / A19) and colicin E3 producing strain results in total protein translation inhibition within 11 minutes (PubMed:4930243). Its activity is inhibited by cognate immunity protein Im3 (PubMed:10986462, PubMed:11741540, PubMed:336615, PubMed:6295812).