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- EMDB-46697: STING oligomer bound to PI(3,5)P2 -

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Basic information

Entry
Database: EMDB / ID: EMD-46697
TitleSTING oligomer bound to PI(3,5)P2
Map data
Sample
  • Complex: STING oligomer bound to its ligand cGAMP, a synthetic activator named STG2, Cholesteryl hemisuccinate and PI(4,5)P2
    • Protein or peptide: Stimulator of interferon genes protein
  • Ligand: 4-({[4-(2-tert-butyl-5,5-dimethyl-1,3-dioxan-2-yl)phenyl]methyl}amino)-3-methoxybenzoic acid
  • Ligand: (2R)-3-{[(R)-hydroxy{[(1S,2R,3R,4S,5S,6R)-2,4,6-trihydroxy-3,5-bis(phosphonooxy)cyclohexyl]oxy}phosphoryl]oxy}propane-1,2-diyl di[(9Z)-octadec-9-enoate]
  • Ligand: CHOLESTEROL HEMISUCCINATE
  • Ligand: cGAMP
KeywordsSTING / lipid / oligomerization / SIGNALING PROTEIN / SIGNALING PROTEIN-ACTIVATOR complex
Function / homology
Function and homology information


STING complex / STAT6-mediated induction of chemokines / serine/threonine protein kinase complex / protein localization to endoplasmic reticulum / 2',3'-cyclic GMP-AMP binding / cyclic-di-GMP binding / STING mediated induction of host immune responses / positive regulation of type I interferon-mediated signaling pathway / IRF3-mediated induction of type I IFN / proton channel activity ...STING complex / STAT6-mediated induction of chemokines / serine/threonine protein kinase complex / protein localization to endoplasmic reticulum / 2',3'-cyclic GMP-AMP binding / cyclic-di-GMP binding / STING mediated induction of host immune responses / positive regulation of type I interferon-mediated signaling pathway / IRF3-mediated induction of type I IFN / proton channel activity / reticulophagy / cGAS/STING signaling pathway / pattern recognition receptor signaling pathway / cellular response to exogenous dsRNA / cytoplasmic pattern recognition receptor signaling pathway / protein complex oligomerization / autophagosome membrane / positive regulation of macroautophagy / autophagosome assembly / cellular response to interferon-beta / positive regulation of defense response to virus by host / positive regulation of type I interferon production / endoplasmic reticulum-Golgi intermediate compartment membrane / signaling adaptor activity / activation of innate immune response / positive regulation of interferon-beta production / autophagosome / secretory granule membrane / Regulation of innate immune responses to cytosolic DNA / cytoplasmic vesicle membrane / antiviral innate immune response / protein serine/threonine kinase binding / SARS-CoV-1 activates/modulates innate immune responses / peroxisome / regulation of inflammatory response / defense response to virus / RNA polymerase II-specific DNA-binding transcription factor binding / mitochondrial outer membrane / transcription coactivator activity / endosome / cilium / ciliary basal body / Golgi membrane / innate immune response / Neutrophil degranulation / ubiquitin protein ligase binding / endoplasmic reticulum membrane / protein kinase binding / perinuclear region of cytoplasm / SARS-CoV-2 activates/modulates innate and adaptive immune responses / protein homodimerization activity / positive regulation of transcription by RNA polymerase II / nucleoplasm / identical protein binding / plasma membrane / cytosol
Similarity search - Function
: / STING transmembrane domain / : / : / Stimulator of interferon genes protein / Stimulator of interferon genes protein, C-terminal domain superfamily / STING ligand-binding domain
Similarity search - Domain/homology
Stimulator of interferon genes protein
Similarity search - Component
Biological speciesHomo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 2.9 Å
AuthorsLi J / Zhang X / Bai X
Funding support United States, 3 items
OrganizationGrant numberCountry
National Institutes of Health/National Cancer Institute (NIH/NCI)R01CA273595 United States
Welch FoundationI-1702 United States
Welch FoundationI-1944 United States
CitationJournal: Nature / Year: 2026
Title: Regulation of STING activation by phosphoinositide and cholesterol.
Authors: Jie Li / Jay Xiaojun Tan / Zhijian J Chen / Xuewu Zhang / Xiao-Chen Bai /
Abstract: Stimulator of interferon genes (STING) is an essential adaptor in the cytosolic DNA-sensing innate immune pathway. STING is activated by cyclic GMP-AMP (cGAMP) produced by the DNA sensor cGAMP ...Stimulator of interferon genes (STING) is an essential adaptor in the cytosolic DNA-sensing innate immune pathway. STING is activated by cyclic GMP-AMP (cGAMP) produced by the DNA sensor cGAMP synthase (cGAS). cGAMP-induced high-order oligomerization and translocation of STING from the endoplasmic reticulum to the Golgi and post-Golgi vesicles are critical for STING activation. Other studies have shown that phosphatidylinositol phosphates (PtdInsPs) and cholesterol also have important roles in STING activation, but the underlying mechanisms remain unclear. Here we demonstrate that cGAMP-induced high-order oligomerization of STING is enhanced strongly by phosphatidylinositol 3,5-bisphosphate (PtdIns(3,5)P and PtdIns(4,5)P, and by PtdIns4P to a lesser extent. Our cryo-electron microscopy structures reveal that PtdInsPs together with cholesterol bind at the interface between STING dimers, directly promoting the high-order oligomerization. The structures also provide an explanation for the preference of the STING oligomer to different PtdInsPs. Mutational and biochemical analyses confirm the binding modes of PtdInsPs and cholesterol and their roles in STING activation. Our findings shed light on the regulatory mechanisms of STING mediated by specific lipids, which may underlie the role of intracellular trafficking in dictating STING signalling.
History
DepositionAug 22, 2024-
Header (metadata) releaseDec 17, 2025-
Map releaseDec 17, 2025-
UpdateFeb 18, 2026-
Current statusFeb 18, 2026Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_46697.png

Downloads & links

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Map

FileDownload / File: emd_46697.map.gz / Format: CCP4 / Size: 134.6 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
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AxesZ (Sec.)Y (Row.)X (Col.)
0.79 Å/pix.
x 328 pix.
= 258.464 Å		0.79 Å/pix.
x 328 pix.
= 258.464 Å		0.79 Å/pix.
x 328 pix.
= 258.464 Å

Surface

Projections

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Images are generated by Spider.

Voxel sizeX=Y=Z: 0.788 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.007
Minimum - Maximum-0.027716912 - 0.058820944
Average (Standard dev.)0.00007026123 (±0.0013697583)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions328328328
Spacing328328328
CellA=B=C: 258.464 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: #2

Fileemd_46697_half_map_1.map
Projections & Slices
AxesZYX

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Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: #1

Fileemd_46697_half_map_2.map
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Sample components

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Entire : STING oligomer bound to its ligand cGAMP, a synthetic activator n...

EntireName: STING oligomer bound to its ligand cGAMP, a synthetic activator named STG2, Cholesteryl hemisuccinate and PI(4,5)P2
Components
  • Complex: STING oligomer bound to its ligand cGAMP, a synthetic activator named STG2, Cholesteryl hemisuccinate and PI(4,5)P2
    • Protein or peptide: Stimulator of interferon genes protein
  • Ligand: 4-({[4-(2-tert-butyl-5,5-dimethyl-1,3-dioxan-2-yl)phenyl]methyl}amino)-3-methoxybenzoic acid
  • Ligand: (2R)-3-{[(R)-hydroxy{[(1S,2R,3R,4S,5S,6R)-2,4,6-trihydroxy-3,5-bis(phosphonooxy)cyclohexyl]oxy}phosphoryl]oxy}propane-1,2-diyl di[(9Z)-octadec-9-enoate]
  • Ligand: CHOLESTEROL HEMISUCCINATE
  • Ligand: cGAMP

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Supramolecule #1: STING oligomer bound to its ligand cGAMP, a synthetic activator n...

SupramoleculeName: STING oligomer bound to its ligand cGAMP, a synthetic activator named STG2, Cholesteryl hemisuccinate and PI(4,5)P2
type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1
Source (natural)Organism: Homo sapiens (human)

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Macromolecule #1: Stimulator of interferon genes protein

MacromoleculeName: Stimulator of interferon genes protein / type: protein_or_peptide / ID: 1 / Number of copies: 4 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 39.553398 KDa
Recombinant expressionOrganism: Homo sapiens (human)
SequenceString: MPHSSLHPSI PCPRGHGAQK AALVLLSACL VTLWGLGEPP EHTLRYLVLH LASLQLGLLL NGVCSLAEEL RHIHSRYRGS YWRTVRACL GCPLRRGALL LLSIYFYYSL PNAVGPPFTW MLALLGLSQA LNILLGLKGL APAEISAVCE KGNFNVAHGL A WSYYIGYL ...String:
MPHSSLHPSI PCPRGHGAQK AALVLLSACL VTLWGLGEPP EHTLRYLVLH LASLQLGLLL NGVCSLAEEL RHIHSRYRGS YWRTVRACL GCPLRRGALL LLSIYFYYSL PNAVGPPFTW MLALLGLSQA LNILLGLKGL APAEISAVCE KGNFNVAHGL A WSYYIGYL RLILPELQAR IRTYNQHYNN LLRGAVSQRL YILLPLDCGV PDNLSMADPN IRFLDKLPQQ TGDRAGIKDR VY SNSIYEL LENGQRAGTC VLEYATPLQT LFAMSQYSQA GFSREDRLEQ AKLFCRTLED ILADAPESQN NCRLIAYQEP ADD SSFSLS QEVLRHLRQE EKEEVTVGTS SGLEVLFQ

UniProtKB: Stimulator of interferon genes protein

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Macromolecule #2: 4-({[4-(2-tert-butyl-5,5-dimethyl-1,3-dioxan-2-yl)phenyl]methyl}a...

MacromoleculeName: 4-({[4-(2-tert-butyl-5,5-dimethyl-1,3-dioxan-2-yl)phenyl]methyl}amino)-3-methoxybenzoic acid
type: ligand / ID: 2 / Number of copies: 2 / Formula: Y6H
Molecular weightTheoretical: 427.533 Da
Chemical component information

ChemComp-Y6H:
4-({[4-(2-tert-butyl-5,5-dimethyl-1,3-dioxan-2-yl)phenyl]methyl}amino)-3-methoxybenzoic acid

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Macromolecule #3: (2R)-3-{[(R)-hydroxy{[(1S,2R,3R,4S,5S,6R)-2,4,6-trihydroxy-3,5-bi...

MacromoleculeName: (2R)-3-{[(R)-hydroxy{[(1S,2R,3R,4S,5S,6R)-2,4,6-trihydroxy-3,5-bis(phosphonooxy)cyclohexyl]oxy}phosphoryl]oxy}propane-1,2-diyl di[(9Z)-octadec-9-enoate]
type: ligand / ID: 3 / Number of copies: 2 / Formula: A1BBH
Molecular weightTheoretical: 1.023066 KDa

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Macromolecule #4: CHOLESTEROL HEMISUCCINATE

MacromoleculeName: CHOLESTEROL HEMISUCCINATE / type: ligand / ID: 4 / Number of copies: 2 / Formula: Y01
Molecular weightTheoretical: 486.726 Da
Chemical component information

ChemComp-Y01:
CHOLESTEROL HEMISUCCINATE

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Macromolecule #5: cGAMP

MacromoleculeName: cGAMP / type: ligand / ID: 5 / Number of copies: 2 / Formula: 1SY
Molecular weightTheoretical: 674.411 Da
Chemical component information

ChemComp-1SY:
cGAMP

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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation stateparticle

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Sample preparation

BufferpH: 7.4
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Image recordingFilm or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Average electron dose: 1.2 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 2.5 µm / Nominal defocus min: 1.0 µm
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Startup modelType of model: EMDB MAP
EMDB ID:

29282

Final reconstructionResolution.type: BY AUTHOR / Resolution: 2.9 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 37302
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD
FSC plot (resolution estimation)

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