ISDA

Deposition Date 2020-07-03

Release Date 2020-08-26

Last Version Date 2023-10-18

Entry Detail

PDB ID:

6XNP

Keywords:

IMMUNE SYSTEM

Title:

Crystal Structure of Human STING CTD complex with SR-717

Biological Source:

Source Organism:

Homo sapiens (Taxon ID: 9606)

Host Organism:

Escherichia coli

Method Details:

Experimental Method:

X-RAY DIFFRACTION

Resolution:

1.77 Å

R-Value Free:

0.20

R-Value Work:

0.16

R-Value Observed:

0.16

Space Group:

P 21 21 21

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Macromolecular Entities

Structures with similar UniProt ID

Protein Blast

Polymer Type:polypeptide(L)
Molecule:Stimulator of interferon protein
Chain IDs:A, B
Chain Length:189
Number of Molecules:2
Biological Source:Homo sapiens

UniProt ID:Q86WV6 Pfam ID:PF15009

Ligand Molecules

EDO

GOL

V67

Primary Citation

Antitumor activity of a systemic STING-activating non-nucleotide cGAMP mimetic.

Chin, E.N, Yu, C, Vartabedian, V.F, Jia, Y, Kumar, M, Gamo, A.M, Vernier, W, Ali, S.H, Kissai, M, Lazar, D.C, Nguyen, N, Pereira, L.E, Benish, B, Woods, A.K, Joseph, S.B, Chu, A, Johnson, K.A, Sander, P.N, Martinez-Pena, F, Hampton, E.N, Young, T.S, Wolan, D.W, Chatterjee, A.K, Schultz, P.G, Petrassi, H.M, Teijaro, J.R, Lairson, L.L.Show

Science 369 993 999 (2020)

PMID: 32820126 DOI: 10.1126/science.abb4255

Abstact

Stimulator of interferon genes (STING) links innate immunity to biological processes ranging from antitumor immunity to microbiome homeostasis. Mechanistic understanding of the anticancer potential for STING receptor activation is currently limited by metabolic instability of the natural cyclic dinucleotide (CDN) ligands. From a pathway-targeted cell-based screen, we identified a non-nucleotide, small-molecule STING agonist, termed SR-717, that demonstrates broad interspecies and interallelic specificity. A 1.8-angstrom cocrystal structure revealed that SR-717 functions as a direct cyclic guanosine monophosphate-adenosine monophosphate (cGAMP) mimetic that induces the same "closed" conformation of STING. SR-717 displayed antitumor activity; promoted the activation of CD8+ T, natural killer, and dendritic cells in relevant tissues; and facilitated antigen cross-priming. SR-717 also induced the expression of clinically relevant targets, including programmed cell death 1 ligand 1 (PD-L1), in a STING-dependent manner.

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Primary Citation of related structures