2’2’-cGAMP Unit size Cat. code Docs Price
STING ligand - Cyclic [G(2’,5’)pA(2’,5’)p]
500 µg
1 mg

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STING ligand

2’2’-cGAMP, cyclic [G(2’,5’)pA(2’,5’)p], is a synthetic cyclic di-nucleotide that binds STING (stimulator of IFN genes) and subsequently induces TBK1-IRF3-dependent production of IFN-β [1]. 2’2’-cGAMP is the isomer of cGAMP most similar to 2’3’-cGAMP in terms of STING binding and type I interferon induction [1].

Certain variants of STING are able to distinguish between noncanonical and canonical cGAMP [2]. cGAMP is more potent in activating type I IFN than c-di-AMP and c-diGMP, other cyclic dinucleotides that also bind STING [3].



1. Zhang X. et al., 2013. Cyclic GMP-AMP containing mixed phosphdiester linkages is an endogenous high-affinity ligand for STING. Mol Cell.51(2):226-35.
2. Diner E. et al., 2013. The Innate Immune DNA Sensor cGAS Produces a Noncanonical Cyclic Dinucleotide that Activates Human STING. Cell Rep. 3(5):1355-61.
3. Burdette D. et al., 2011. STING is a direct innate immune sensor of cyclic di-GMP. Nature. 478(7370):515-8.


IRF INDUCTION (Lucia luciferase reporter)
IRF INDUCTION (Lucia luciferase reporter)

THP1-Dual™ cells were stimulated for 24 hours with the STING ligands as shown (all at 10 μg/ml). IRF induction was determined by measuring the relative light units (RLUs) in a luminometer using QUANTI‑Luc™, a Lucia luciferase detection reagent.


THP1-Dual™ cells were stimulated for 24 hours with the STING ligands as shown (all at 10 μg/ml). NF‑kB induction was determined using QUANTI‑Blue™, a SEAP detection reagent, and by reading the optical density (OD) at 655 nm. Non-induced cells (NI) have been included as a negative control.

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Description: Synthetic STING agonist

Synonym: Cyclic [G(2’,5’)pA(2’,5’)p], cyclic GMP-AMP; c-GpAp sodium salt

Formula: C20H22N10O13P2 .2Na

Molecular weight: 718.38

Purity: ≥ 95% by LC/MS

Solubility: 50 mg/ml in water

Quality control:

  • The biological activity is assessed by measuring induction of the interferon pathway in THP1-Blue™ ISG cells.
  • The absence of endotoxins and other bacterial contaminants has been confirmed using HEK-Blue™ TLR4 and HEK-Blue™ TLR2 cells.
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2’2’-cGAMP is provided as a lyophilized powder and is available in two quantities:

  • 500 µg 2’2’-cGAMP
  • 1.5 ml endotoxin-free water


  • 1 mg (2 x 500 µg) 2’2’-cGAMP
  • 1.5 ml endotoxin-free water

room temperature 2’2’-cGAMP is shipped at room temperature

store 2’2’-cGAMP should be stored at -20°C.

Product is sterile filtered prior to lyophilization.

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