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ribonuclease toxin immunity protein CdiI
Contact-dependent growth inhibition (CDI) is a mechanism of inter-cellular competition in which Gram-negative bacteria exchange polymorphic toxins using type V secretion systems. Structure analysis of the CDI toxin from Escherichia coli NC101 reveals that it has moderate structural homology to Whirly-like proteins found in plastids, but appears to lack the characteristic Whirly RNA-binding site [1]. [1]. 26057799. The structure of a contact-dependent growth-inhibition (CDI). immunity protein from Neisseria meningitidis MC58.. Tan K, Johnson PM, Stols L, Boubion B, Eschenfeldt W, Babnigg G,. Hayes CS, Joachimiak A, Goulding CW;. Acta Crystallogr F Struct Biol Commun. 2015;71:702-709. (from Pfam)
CdiI proteins, including the founding member from Escherichia coli strain STEC_O31, serve as immunity proteins for the toxic tRNA-cleaving ribonuclease toxin CdiA. The system confers contact-dependent inhibition (cdi) between different strains of bacteria.
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