Endoribonuclease ToxN - Q3YN09 (TOXN_BACTK)


Protein Feature View of PDB entries mapped to a UniProtKB sequence  

  • Number of PDB entries for Q3YN09: 1
Toxic component of a type III toxin-antitoxin (TA) system (PubMed:19124776). An endoribonuclease which cleaves between the first and second A of AAAAA sequences; it tolerates other nucleotides in positions +2 and +4 of the consensus. Digests cognate antitoxin RNA ToxI as shown by the 2'-3'-cyclic phosphate at the 3' end of the 34-nt repeats and probably other RNAs (PubMed:23267117). Inhibits growth when expressed in E.coli without causing cell lysis; this bacteriostatic effect is neutralized by cognate RNA antitoxin ToxI, which has 2.9 nearly identical 34 nucleotide-long repeats (PubMed:19124776). Non-cognate antitoxin RNA from P.atrosepticum does not inhibit this toxin (PubMed:23267117). The toxin-antitoxin pair function in plasmid maintenance (a plasmid addiction system), but unlike its P.atrosepticum homolog it is not seen to confer resistance to bacteriophages (PubMed:23267117). UniProt
Pathway Maps
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Subunit Structure
One ToxN monomer binds to a 34-nt-long single repeat of the ToxI RNA; this complex forms a triangular heterohexameric complex with ToxN connected by the ToxI RNA to another toxin molecule. The ToxI repeats are cleavage products of their precursor. The ToxI repeat forms a pseudoknot which occludes the toxin active site. UniProt
  • Other Gene names: toxN, pAW63_066
This protein in other organisms (by gene name):
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The PDB to UniProt mapping is based on the data provided by the EBI SIFTS project. See also Velankar et al., Nucleic Acids Research 33, D262-265 (2005).
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