16S rRNA endonuclease CdiA - D5CBA0 (CDIA_ENTCC)


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  • Number of PDB entries for D5CBA0: 1
Toxic component of a toxin-immunity protein module, which functions as a cellular contact-dependent growth inhibition (CDI) system. CDI modules allow bacteria to communicate with and inhibit the growth of closely related neighboring bacteria in a contact-dependent fashion; upon forced induction decreases E.cloacae target cell counts about 20-fold, about 100-fold in E.coli. Intracellular expression of CdiA-CT (residues 3087-3321) inhibits E.coli cell growth when induced, but coexpression with its cognate immunity protein CdiI allows cell growth. Cleaves 16S rRNA in vivo and in vitro between adenine 1493 and guanosine 1494 of E.coli 16S rRNA. Inhibition of 16S rRNA cleavage is specific to the cognate immunity protein, non-cognate CdiI from E.chrysanthemi strain EC16 does not inhibit this protein (PubMed:24657090). Purified CdiA-CT inhibits E.coli cell growth when added to cultures but not when added as a complex with cognate CdiI, suggesting cognate CdiI prevents import into the target cell. CdiA-CT (without CdiI) is probably imported in an F-pilus-mediated fashion, although it is not clear if this is physiologically significant (PubMed:24889811). UniProt
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Subunit Structure
Interacts with cognate immunity protein CdiI, blocking the active site of the nuclease. UniProt
The 16S rRNASe and CDI activities reside in the C-terminal (CT) domain, residues 3087-3321. UniProt
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