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Title: STING Polymer Structure Reveals Mechanisms for Activation, Hyperactivation, and Inhibition

Journal Article · · Cell
 [1];  [1];  [2];  [1]
  1. Stanford Univ., CA (United States)
  2. SLAC National Accelerator Lab., Menlo Park, CA (United States)

How the central innate immune protein, STING, is activated by its ligands remains unknown. In this study, using structural biology and biochemistry, we report that the metazoan second messenger 2'3'-cGAMP induces closing of the human STING homodimer and release of the STING C-terminal tail, which exposes a polymerization interface on the STING dimer and leads to the formation of disulfide-linked polymers via cysteine residue 148. Disease-causing hyperactive STING mutations either flank C148 and depend on disulfide formation or reside in the C-terminal tail binding site and cause constitutive C-terminal tail release and polymerization. Finally, bacterial cyclic-di-GMP induces an alternative active STING conformation, activates STING in a cooperative manner, and acts as a partial antagonist of 2'3'-cGAMP signaling. In conclusion, our insights explain the tight control of STING signaling given varying background activation signals and provide a therapeutic hypothesis for autoimmune syndrome treatment.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
AC02-76SF00515; P41GM103393; 5 T32 GM007276
OSTI ID:
1546886
Journal Information:
Cell, Vol. 178, Issue 2; ISSN 0092-8674
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 132 works
Citation information provided by
Web of Science

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Cited By (2)

Regulation of cGAS- and RLR-mediated immunity to nucleic acids journal December 2019
STING Activation and its Application in Immuno-Oncology journal November 2019