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Title: Molecular basis for the specific recognition of the metazoan cyclic GMP-AMP by the innate immune adaptor protein STING

Journal Article · · Proceedings of the National Academy of Sciences of the United States of America
 [1]; ORCiD logo [2];  [3];  [1]
  1. Univ. of Texas Southwestern Medical Center, Dallas, TX (United States). Dept. of Biochemistry
  2. Univ. of Texas Southwestern Medical Center, Dallas, TX (United States). Dept. of Molecular Biology
  3. Univ. of Texas Southwestern Medical Center, Dallas, TX (United States). Dept. of Molecular Biology. Howard Hughes Medical Inst.

Cyclic GMP-AMP containing a unique combination of mixed phosphodiester linkages (2'3'-cGAMP) is an endogenous second messenger molecule that activates the type-I IFN pathway upon binding to the homodimer of the adaptor protein STING on the surface of endoplasmic reticulum membrane. However, the preferential binding of the asymmetric ligand 2'3'-cGAMP to the symmetric dimer of STING represents a physicochemical enigma. In this paper, we show that 2'3'-cGAMP, but not its linkage isomers, adopts an organized free-ligand conformation that resembles the STING-bound conformation and pays low entropy and enthalpy costs in converting into the active conformation. Finally, our results demonstrate that analyses of free-ligand conformations can be as important as analyses of protein conformations in understanding protein–ligand interactions.

Research Organization:
Univ. of Texas Southwestern Medical Center, Dallas, TX (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER); National Inst. of Health (NIH) (United States); Welch Foundation (United States)
Grant/Contract Number:
AC02-06CH11357; R01-GM-079554; R01-AI-093967; I-1868
OSTI ID:
1213725
Journal Information:
Proceedings of the National Academy of Sciences of the United States of America, Vol. 112, Issue 29; ISSN 0027-8424
Publisher:
National Academy of Sciences, Washington, DC (United States)Copyright Statement
Country of Publication:
United States
Language:
ENGLISH
Citation Metrics:
Cited by: 49 works
Citation information provided by
Web of Science

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Cited By (10)

Crystal structures of porcine STING CBD –CDN complexes reveal the mechanism of ligand recognition and discrimination of STING proteins journal June 2019
Regulation and function of the cGAS–STING pathway of cytosolic DNA sensing journal September 2016
Cellular and molecular regulation of innate inflammatory responses journal October 2016
Computational and NMR spectroscopy insights into the conformation of cyclic di-nucleotides journal November 2017
Cryo-EM structures of STING reveal its mechanism of activation by cyclic GMP–AMP journal March 2019
Viral and metazoan poxins are cGAMP-specific nucleases that restrict cGAS–STING signalling journal February 2019
TRIM21 Promotes Innate Immune Response to RNA Viral Infection through Lys27-Linked Polyubiquitination of MAVS journal May 2018
cGAS in action: Expanding roles in immunity and inflammation journal March 2019
Virology: Poxins Soothe the STING journal May 2019
Selective Loss of Responsiveness to Exogenous but Not Endogenous Cyclic-Dinucleotides in Mice Expressing STING-R231H journal February 2020

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