CBASS (cyclic oligonucleotide-based antiphage signaling system) provides immunity against bacteriophage. The CD-NTase protein 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(UA) CBASS system (PubMed:32839535). Phospholipase that is activated upon binding to the cyclic dinucleotide (CDN) second messenger 3',3'-cyclic UMP-AMP (3',3'-cUAMP). a 1,2-diacyl-sn-glycero-3-phosphocholine + H2O = a 2-acyl-sn-glycero-3-phosphocholine + a fatty acid + H(+) Phospholipase activity is specifically activated upon 3',3'-cUAMP binding. Is not activated by the other cyclic dinucleotides 3',3'-cGAMP, 3',3'-c-diAMP and 3',3'-c-diGMP. Therefore, is specifically activated by only the nucleotide synthesized from its adjacently encoded nucleotidyltransferase (CdnE). This is a complex CBASS locus with the loci capE-cdnE-probable diadenylate cyclase-capV-dcnV1-cap2-cap3. Belongs to the patatin family.