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Open data
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Basic information
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| Title | Cryo-EM Structure of CXCL1-KSHV ORF74-Gi-scFv16 Complex | |||||||||
Map data | Cryo-EM Structure of CXCL1-KSHV ORF74-Gi-scFv16 Complex | |||||||||
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Keywords | KSHV vGPCR / Viral GPCR / KSHV ORF74 / ORF74-CXCL1 / ORF74 Active / CXCL1 bound ORF74 / KSHV ORF74-CXCL1-Gi-scFv16 / VIRAL PROTEIN / VIRAL PROTEIN-SIGNALING PROTEIN complex | |||||||||
| Function / homology | Function and homology informationC-C chemokine receptor activity / C-C chemokine binding / chemokine activity / Chemokine receptors bind chemokines / Interleukin-10 signaling / adenylate cyclase inhibitor activity / positive regulation of protein localization to cell cortex / Adenylate cyclase inhibitory pathway / T cell migration / D2 dopamine receptor binding ...C-C chemokine receptor activity / C-C chemokine binding / chemokine activity / Chemokine receptors bind chemokines / Interleukin-10 signaling / adenylate cyclase inhibitor activity / positive regulation of protein localization to cell cortex / Adenylate cyclase inhibitory pathway / T cell migration / D2 dopamine receptor binding / response to prostaglandin E / adenylate cyclase regulator activity / G protein-coupled serotonin receptor binding / adenylate cyclase-inhibiting serotonin receptor signaling pathway / cellular response to forskolin / regulation of mitotic spindle organization / cell chemotaxis / Regulation of insulin secretion / growth factor activity / enzyme activator activity / positive regulation of cholesterol biosynthetic process / calcium-mediated signaling / negative regulation of insulin secretion / G protein-coupled receptor binding / response to peptide hormone / adenylate cyclase-inhibiting G protein-coupled receptor signaling pathway / adenylate cyclase-modulating G protein-coupled receptor signaling pathway / G-protein beta/gamma-subunit complex binding / centriolar satellite / Olfactory Signaling Pathway / specific granule lumen / Activation of the phototransduction cascade / G beta:gamma signalling through PLC beta / Presynaptic function of Kainate receptors / Thromboxane signalling through TP receptor / G protein-coupled acetylcholine receptor signaling pathway / Activation of G protein gated Potassium channels / Inhibition of voltage gated Ca2+ channels via Gbeta/gamma subunits / G-protein activation / chemotaxis / Prostacyclin signalling through prostacyclin receptor / G beta:gamma signalling through CDC42 / Glucagon signaling in metabolic regulation / G beta:gamma signalling through BTK / Synthesis, secretion, and inactivation of Glucagon-like Peptide-1 (GLP-1) / ADP signalling through P2Y purinoceptor 12 / photoreceptor disc membrane / Sensory perception of sweet, bitter, and umami (glutamate) taste / Glucagon-type ligand receptors / Adrenaline,noradrenaline inhibits insulin secretion / Vasopressin regulates renal water homeostasis via Aquaporins / GDP binding / Glucagon-like Peptide-1 (GLP1) regulates insulin secretion / G alpha (z) signalling events / cellular response to catecholamine stimulus / ADP signalling through P2Y purinoceptor 1 / ADORA2B mediated anti-inflammatory cytokines production / G beta:gamma signalling through PI3Kgamma / adenylate cyclase-activating dopamine receptor signaling pathway / Cooperation of PDCL (PhLP1) and TRiC/CCT in G-protein beta folding / tertiary granule lumen / GPER1 signaling / Inactivation, recovery and regulation of the phototransduction cascade / cellular response to prostaglandin E stimulus / G-protein beta-subunit binding / nervous system development / heterotrimeric G-protein complex / G alpha (12/13) signalling events / sensory perception of taste / extracellular vesicle / signaling receptor complex adaptor activity / Thrombin signalling through proteinase activated receptors (PARs) / retina development in camera-type eye / G protein activity / positive regulation of cytosolic calcium ion concentration / GTPase binding / Ca2+ pathway / actin cytoskeleton organization / fibroblast proliferation / midbody / High laminar flow shear stress activates signaling by PIEZO1 and PECAM1:CDH5:KDR in endothelial cells / cell cortex / G alpha (i) signalling events / G alpha (s) signalling events / phospholipase C-activating G protein-coupled receptor signaling pathway / G alpha (q) signalling events / Hydrolases; Acting on acid anhydrides; Acting on GTP to facilitate cellular and subcellular movement / Ras protein signal transduction / Extra-nuclear estrogen signaling / cell population proliferation / intracellular signal transduction / immune response / ciliary basal body / G protein-coupled receptor signaling pathway / inflammatory response / signaling receptor binding / negative regulation of cell population proliferation / lysosomal membrane / cell division / GTPase activity Similarity search - Function | |||||||||
| Biological species | Homo sapiens (human) / ![]() Human gammaherpesvirus 8 / ![]() | |||||||||
| Method | single particle reconstruction / cryo EM / Resolution: 2.98 Å | |||||||||
Authors | Sahoo B / Seo HD / Dai X / Jung J | |||||||||
| Funding support | United States, 1 items
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Citation | Journal: Nat Commun / Year: 2025Title: Structural basis for ligand promiscuity and high signaling activity of Kaposi's Sarcoma-associated Herpesvirus-encoded GPCR. Authors: Jun Bae Park / Bibekananda Sahoo / Amita Rani Sahoo / Dokyun Kim / Hogyu David Seo / James Bowman / Mi-Jeong Kwak / Sophia Suh / Matthias Buck / Xinghong Dai / Jae U Jung / ![]() Abstract: Kaposi's Sarcoma-associated Herpesvirus encodes ORF74, a viral G protein-coupled receptor homologous to CXCR2, which plays a crucial role in Kaposi's Sarcoma development through its high basal ...Kaposi's Sarcoma-associated Herpesvirus encodes ORF74, a viral G protein-coupled receptor homologous to CXCR2, which plays a crucial role in Kaposi's Sarcoma development through its high basal signaling activity. Our cryoEM analysis of ORF74 in ligand-free, BRIL-fused ligand-free, and CXCL1/Gi-bound forms elucidates its ligand-independent signaling activity. A widely open, static extracellular cavity facilitates ligand promiscuity by enabling dynamic access and diverse binding modes. Structural alterations in CWxP, E/DRY, and NPxxY micro-switches stabilize the active conformation, leading to constitutive signaling. Metadynamics simulations reveal a dynamic ensemble between local switch structures corresponding to the inactive and active states, supporting spontaneous activation. CXCR2-ORF74 chimeras highlight intracellular loops 2 and 3 as key modulators of basal and agonist-induced activity. This study defines the structural basis of ORF74's ligand promiscuity, spontaneous activation, and high basal signaling, providing insights into its role in viral oncogenesis. | |||||||||
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Structure visualization
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Downloads & links
-EMDB archive
| Map data | emd_48100.map.gz | 29.5 MB | EMDB map data format | |
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| Header (meta data) | emd-48100-v30.xml emd-48100.xml | 24 KB 24 KB | Display Display | EMDB header |
| Images | emd_48100.png | 29.9 KB | ||
| Filedesc metadata | emd-48100.cif.gz | 7.5 KB | ||
| Archive directory | http://ftp.pdbj.org/pub/emdb/structures/EMD-48100 ftp://ftp.pdbj.org/pub/emdb/structures/EMD-48100 | HTTPS FTP |
-Validation report
| Summary document | emd_48100_validation.pdf.gz | 401.3 KB | Display | EMDB validaton report |
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| Full document | emd_48100_full_validation.pdf.gz | 400.9 KB | Display | |
| Data in XML | emd_48100_validation.xml.gz | 6.4 KB | Display | |
| Data in CIF | emd_48100_validation.cif.gz | 7.4 KB | Display | |
| Arichive directory | https://ftp.pdbj.org/pub/emdb/validation_reports/EMD-48100 ftp://ftp.pdbj.org/pub/emdb/validation_reports/EMD-48100 | HTTPS FTP |
-Related structure data
| Related structure data | ![]() 9ejcMC ![]() 8w1aC C: citing same article ( M: atomic model generated by this map |
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| Similar structure data | Similarity search - Function & homology F&H Search |
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Links
| EMDB pages | EMDB (EBI/PDBe) / EMDataResource |
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| Related items in Molecule of the Month |
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Map
| File | Download / File: emd_48100.map.gz / Format: CCP4 / Size: 181 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) | ||||||||||||||||||||||||||||||||||||
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| Annotation | Cryo-EM Structure of CXCL1-KSHV ORF74-Gi-scFv16 Complex | ||||||||||||||||||||||||||||||||||||
| Projections & slices | Image control
Images are generated by Spider. | ||||||||||||||||||||||||||||||||||||
| Voxel size | X=Y=Z: 0.66 Å | ||||||||||||||||||||||||||||||||||||
| Density |
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| Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||
| Details | EMDB XML:
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-Supplemental data
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Sample components
+Entire : Cryo-EM Structure of CXCL1-KSHV ORF74-Gi-scFv16 Complex
+Supramolecule #1: Cryo-EM Structure of CXCL1-KSHV ORF74-Gi-scFv16 Complex
+Supramolecule #2: Gi protein
+Supramolecule #3: KSHV ORF74
+Supramolecule #4: CXCL1
+Supramolecule #5: scFv16
+Macromolecule #1: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1
+Macromolecule #2: Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2
+Macromolecule #3: viral G-protein coupled receptor
+Macromolecule #4: Growth-regulated alpha protein
+Macromolecule #5: Guanine nucleotide-binding protein G(i) subunit alpha-1
+Macromolecule #6: scFv Recombinant Mouse Monoclonal Antibody (scFv16)
-Experimental details
-Structure determination
| Method | cryo EM |
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Processing | single particle reconstruction |
| Aggregation state | particle |
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Sample preparation
| Concentration | 10 mg/mL |
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| Buffer | pH: 7.5 / Component - Concentration: 10.0 mM / Component - Formula: C8H18N2O4S / Component - Name: HPEPS Details: 10 mM HEPES pH 7.5, 150 mM NaCl, 0.001% (w/v) LMNG, 0.0001% (w/v) CHS, 0.001% (w/v) GDN |
| Vitrification | Cryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 278 K / Instrument: FEI VITROBOT MARK IV |
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Electron microscopy
| Microscope | TFS KRIOS |
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| Image recording | Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Average electron dose: 50.0 e/Å2 |
| Electron beam | Acceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN |
| Electron optics | Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 1.5 µm / Nominal defocus min: 0.8 µm |
| Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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About Yorodumi




Keywords
Homo sapiens (human)
Human gammaherpesvirus 8
Authors
United States, 1 items
Citation



































Z (Sec.)
Y (Row.)
X (Col.)




















Trichoplusia ni (cabbage looper)
Processing
FIELD EMISSION GUN
