Metalloprotease priming reversal component of a CBASS antivirus system. CBASS (cyclic oligonucleotide-based antiphage signaling system) provides immunity against bacteriophages. The CD-NTase protein (DncV) synthesizes cyclic nucleotides in response to infection; these serve as specific second messenger signals. The signals activate a diverse range of effectors, leading to bacterial cell death and thus abortive phage infection. A type II-A(GA) CBASS system