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 III-C(AAA) CBASS system (PubMed:32839535). Prevents the CdnD:Cap7:Cap8 complex (also called CdnD:HORMA2:HORMA3) from synthesizing 2',3',3'-cyclic AMP-AMP-AMP (cAAA) (PubMed:31932165). Binds and disassembles an active CdnD:Cap7:Cap8 complex, inhibiting the complex's ability to synthesize cyclic nucleotide second messengers. An AAA+-ATPase remodeler, it is thought that in the absence of foreign threat Cap6 maintains the Cap7 protein in an open, inactive state. Once activated (presumably by a bacteriophage protein) Cap7 binds to and activates its cognate CD-NTase (CdnD in this bacteria) to synthesize cAAA, a cyclic nucleotide second messenger. cAAA activates the NucC endonuclease which degrades all DNA in the infected cell, causing cell death and abortive phage infection (Probable). Oligomerizes (PubMed:31932165). Homohexamer. Forms a 1:1:6 CdnD:Cap7:Cap6 complex (Probable). Belongs to the AAA ATPase family.