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CDN-A, a cyclic di-nucleotide, serves as a precursor for synthesizing antibody-drug conjugates (ADC) and acts as a potent stimulator of both innate and adaptive immune responses. In humans, these cyclic di-nucleotides, produced endogenously in response to foreign DNA or by bacterial pathogens, activate the innate immune system by inducing the expression of interferon genes [1] [2] [3].

Mal-VC-PAB-PNP-CDN-A is a conjugate used in antibody-drug conjugates (ADC), consisting of an agent and a linker [1] [2].

CDN1163 is a small molecule activator of sarco endoplasmic reticulum Ca2+-ATPase (SERCA).

SN-011 (GUN35901) is a STING inhibitor, which inhibited the activation of the STING signal pathway and to prevent or treat a STING- mediated disease. It is a demethyl analogue of DUN99845.

cGAMP disodium is a cyclic dinucleotide (CDN) found in bacteria that acts as an endogenous second messenger affecting interferon production in response to cytoplasmic DNA. cGAMP disodium cascades signals from type I interferons and other immune mediators by activating interferon gene stimulator (STING). cGAMP disodium is a potent sublingual immune adjuvant that enables better immune function (serum anti-PA neutralization and airway secretions anti-PA SIgA response).

2'2'-cGAMP is a synthetic dinucleotide (CDN) that contains non-canonical 2'5'-phosphodiester bonds. It binds to the adapter protein stimulator of interferon genes , which is a component of the innate immune response that activates the type I interferon pathway when bound to cyclic dinucleotides. 2'2-cGAMP shows weaker binding to STING than 2'3'-cGAMP but binds more strongly than 3'3'-cGAMP , cyclic di-GMP , or 3'2'-cGAMP, which bind in the micromolar range (Kds = 1.04, 1.21, or 1.61 μM, respectively). Despite weaker binding, 2'2'-cGAMP induces IFN-β production in the same concentration range as 2'3'-cGAMP (EC50s = 15.8 and 19.4 nM, respectively, in L929 cells).

Cyclic di-UMP is a pyrimidine-containing cyclic dinucleotide (CDN).1It is produced by bacterial cGAS/DncV-like nucleotidyltransferases (CD-NTases), such as LpCdnE02 fromL. pneumophila, and binds to cGAS, in the apo or dsDNA-bound forms, with reduced affinity compared to 2'3'-cGAMP or 3'3'-cGAMP .1,2Cyclic di-UMP is intended for use as a negative control for cyclic di-GMP signaling. 1.Whiteley, A.T., Eaglesham, J.B., de Oliveira Mann, C.C., et al.Bacterial cGAS-like enzymes synthesize diverse nucleotide signalsNature564(7747)194-199(2019) 2.Hall, J., Ralph, E.C., Shanker, S., et al.The catalytic mechanism of cyclic GMP-AMP synthase (cGAS) and implications for innate immunity and inhibitionProtein Sci.26(12)2367-2380(2017)

BI 7446 is a potent and selective cyclic dinucleotide (CDN)-based stimulator of interferon genes (STING) agonist capable of activating all five STING variants in cells, thus inducing tumor-specific immune-mediated tumor rejection. This compound is utilized in immuno-oncology research [1].

C82 acts as an inhibitor of Mycobacterium tuberculosis (Mtb) cyclic dinucleotide phosphodiesterase (CdnP), with an IC50 value of 17.5 µM. This particular enzyme is responsible for breaking down cyclic di-AMP (c-di-AMP) into adenosine 5'-monophosphate (AMP). Notably, C82 demonstrates selectivity for Mtb CdnP over other bacterial cyclic dinucleotide phosphodiesterases (CDN PDEs) such as Yybt, RocR, and Group B Streptococcus (GBS) CdnP, as well as the mammalian CDN PDE ENPP1, and the viral CDN PDE poxin, showing effectiveness at a concentration of 200 µM.