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Open data
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Basic information
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| Title | Structure of EP67 bound mouse C5aR1 in complex with Go | ||||||||||||
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Keywords | GPCR / G protein / SIGNALING PROTEIN / SIGNALING PROTEIN-IMMUNE SYSTEM complex | ||||||||||||
| Function / homology | Function and homology informationcomplement component C5a binding / cell proliferation in hindbrain / response to peptidoglycan / presynapse organization / complement component C5a signaling pathway / Regulation of Complement cascade / Peptide ligand-binding receptors / complement component C5a receptor activity / Muscarinic acetylcholine receptors / G protein-coupled acetylcholine receptor activity ...complement component C5a binding / cell proliferation in hindbrain / response to peptidoglycan / presynapse organization / complement component C5a signaling pathway / Regulation of Complement cascade / Peptide ligand-binding receptors / complement component C5a receptor activity / Muscarinic acetylcholine receptors / G protein-coupled acetylcholine receptor activity / regulation of locomotion / G alpha (i) signalling events / mu-type opioid receptor binding / adenylate cyclase-inhibiting G protein-coupled acetylcholine receptor signaling pathway / corticotropin-releasing hormone receptor 1 binding / complement receptor mediated signaling pathway / positive regulation of neutrophil chemotaxis / G protein-coupled dopamine receptor signaling pathway / positive regulation of macrophage chemotaxis / parallel fiber to Purkinje cell synapse / amyloid-beta clearance / positive regulation of vascular endothelial growth factor production / negative regulation of insulin secretion / G protein-coupled receptor signaling pathway, coupled to cyclic nucleotide second messenger / postsynaptic modulation of chemical synaptic transmission / neutrophil chemotaxis / muscle contraction / Neutrophil degranulation / astrocyte activation / positive regulation of epithelial cell proliferation / adenylate cyclase-inhibiting serotonin receptor signaling pathway / G protein-coupled serotonin receptor binding / microglial cell activation / mRNA transcription by RNA polymerase II / cognition / GABA-ergic synapse / G protein-coupled receptor activity / positive regulation of angiogenesis / G-protein beta/gamma-subunit complex binding / apical part of cell / adenylate cyclase-inhibiting G protein-coupled receptor signaling pathway / adenylate cyclase-modulating G protein-coupled receptor signaling pathway / phospholipase C-activating G protein-coupled receptor signaling pathway / Olfactory Signaling Pathway / Activation of the phototransduction cascade / G protein-coupled acetylcholine receptor signaling pathway / G beta:gamma signalling through PLC beta / Presynaptic function of Kainate receptors / Thromboxane signalling through TP receptor / Activation of G protein gated Potassium channels / Inhibition of voltage gated Ca2+ channels via Gbeta/gamma subunits / G-protein activation / Glucagon signaling in metabolic regulation / G beta:gamma signalling through CDC42 / Prostacyclin signalling through prostacyclin receptor / Synthesis, secretion, and inactivation of Glucagon-like Peptide-1 (GLP-1) / G beta:gamma signalling through BTK / photoreceptor disc membrane / ADP signalling through P2Y purinoceptor 12 / Glucagon-type ligand receptors / Sensory perception of sweet, bitter, and umami (glutamate) taste / Adrenaline,noradrenaline inhibits insulin secretion / Vasopressin regulates renal water homeostasis via Aquaporins / Glucagon-like Peptide-1 (GLP1) regulates insulin secretion / G alpha (z) signalling events / cellular response to catecholamine stimulus / ADP signalling through P2Y purinoceptor 1 / G beta:gamma signalling through PI3Kgamma / ADORA2B mediated anti-inflammatory cytokines production / adenylate cyclase-activating dopamine receptor signaling pathway / cellular response to prostaglandin E stimulus / Cooperation of PDCL (PhLP1) and TRiC/CCT in G-protein beta folding / GPER1 signaling / heterotrimeric G-protein complex / Inactivation, recovery and regulation of the phototransduction cascade / G alpha (12/13) signalling events / G-protein beta-subunit binding / extracellular vesicle / positive regulation of cytosolic calcium ion concentration / Thrombin signalling through proteinase activated receptors (PARs) / signaling receptor complex adaptor activity / cell body / GTPase binding / presynaptic membrane / cytoplasmic vesicle / G protein activity / chemical synaptic transmission / Ca2+ pathway / negative regulation of neuron apoptotic process / High laminar flow shear stress activates signaling by PIEZO1 and PECAM1:CDH5:KDR in endothelial cells / G alpha (i) signalling events / G alpha (s) signalling events / basolateral plasma membrane / G alpha (q) signalling events / Hydrolases; Acting on acid anhydrides; Acting on GTP to facilitate cellular and subcellular movement / Ras protein signal transduction / positive regulation of ERK1 and ERK2 cascade / postsynaptic membrane / cell surface receptor signaling pathway / Extra-nuclear estrogen signaling Similarity search - Function | ||||||||||||
| Biological species | ![]() Homo sapiens (human) | ||||||||||||
| Method | single particle reconstruction / cryo EM / Resolution: 3.31 Å | ||||||||||||
Authors | Banerjee R / Yadav R / Yadav MK / Ganguly M / Mishra S / Dalal A / Gati C / Shukla AK | ||||||||||||
| Funding support | India, United Kingdom, 3 items
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Citation | Journal: Proc Natl Acad Sci U S A / Year: 2026Title: Structural basis of complement anaphylatoxin receptor activation by an immunostimulant lead candidate. Authors: Annu Dalal / Manish K Yadav / Manisankar Ganguly / Sudha Mishra / Ravi Yadav / Shachie Sinha / Nabarun Roy / Divyanshu Tiwari / Debdatta Mukherjee / Ashna Reyaz / Calvin A Dsouza / Ameesha ...Authors: Annu Dalal / Manish K Yadav / Manisankar Ganguly / Sudha Mishra / Ravi Yadav / Shachie Sinha / Nabarun Roy / Divyanshu Tiwari / Debdatta Mukherjee / Ashna Reyaz / Calvin A Dsouza / Ameesha Nigam / Nilanjana Banerjee / Xaria X Li / Richard J Clark / Trent M Woodruff / Ramanuj Banerjee / Cornelius Gati / Arun K Shukla / ![]() Abstract: Activation of the complement cascade is a primary innate immune response mechanism to combat pathogenic infections. Complement anaphylatoxins (i.e., C3a and C5a) exert a robust inflammatory response ...Activation of the complement cascade is a primary innate immune response mechanism to combat pathogenic infections. Complement anaphylatoxins (i.e., C3a and C5a) exert a robust inflammatory response via prototypical GPCRs (i.e., C3aR and C5aR1). Several peptides derived from anaphylatoxins have shown promise as immunostimulants from therapeutic standpoint by eliciting immune response without excessive inflammation. EP67, a C5a-derived decapeptide, is the most advanced candidate with preclinical indications in antiviral and antibacterial context. Still, the molecular mechanism and the precise receptor target of EP67 remain unclear. Here, we perform a comprehensive pharmacological profiling of EP67 on the human and mouse C3aR and C5aR1 and find that it preferentially activates human C3aR in transducer-coupling assays. Subsequently, we determined four cryo-EM structures of C3aR and C5aR1 in complex with EP67, which elucidate the molecular details of its interaction with, and activation of, these receptors. Interestingly, we observe that EP67 adopts a hook-like structure and binds in the orthosteric pocket of the receptors, analogous to that of the carboxyl terminus of C3a and C5a. We employ site-directed mutagenesis studies to validate the key interactions of EP67 with these receptors and corroborate the structural observations including the engagement of a critical activation switch. Finally, we observe that EP67 induces distinct conformations of the TM7-Helix8 interface for C3aR and C5aR1, which provides a plausible explanation for its ability to preferentially activate C3aR. In summary, our study elucidates molecular insights into the interaction of EP67 with the complement anaphylatoxin receptors, and it should facilitate further optimization for therapeutic applications. | ||||||||||||
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Structure visualization
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Downloads & links
-EMDB archive
| Map data | emd_62626.map.gz | 54.9 MB | EMDB map data format | |
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| Header (meta data) | emd-62626-v30.xml emd-62626.xml | 30.4 KB 30.4 KB | Display Display | EMDB header |
| FSC (resolution estimation) | emd_62626_fsc.xml | 8.4 KB | Display | FSC data file |
| Images | emd_62626.png | 33.9 KB | ||
| Filedesc metadata | emd-62626.cif.gz | 7.8 KB | ||
| Others | emd_62626_half_map_1.map.gz emd_62626_half_map_2.map.gz | 59.5 MB 59.5 MB | ||
| Archive directory | http://ftp.pdbj.org/pub/emdb/structures/EMD-62626 ftp://ftp.pdbj.org/pub/emdb/structures/EMD-62626 | HTTPS FTP |
-Related structure data
| Related structure data | ![]() 9kxsMC ![]() 9kugC ![]() 9kz2C ![]() 9kz8C M: atomic model generated by this map C: citing same article ( |
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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_62626.map.gz / Format: CCP4 / Size: 64 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) | ||||||||||||||||||||||||||||||||||||
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| Projections & slices | Image control
Images are generated by Spider. | ||||||||||||||||||||||||||||||||||||
| Voxel size | X=Y=Z: 1.2094 Å | ||||||||||||||||||||||||||||||||||||
| Density |
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| Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||
| Details | EMDB XML:
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-Supplemental data
-Half map: #2
| File | emd_62626_half_map_1.map | ||||||||||||
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| Density Histograms |
-Half map: #1
| File | emd_62626_half_map_2.map | ||||||||||||
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| Density Histograms |
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Sample components
+Entire : EP67 bound to mouse C5aR1 in complex with Go
+Supramolecule #1: EP67 bound to mouse C5aR1 in complex with Go
+Supramolecule #2: mouse C5a anaphylatoxin chemotactic receptor 1
+Supramolecule #3: Guanine nucleotide-binding protein G(o) subunit alpha
+Supramolecule #4: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1
+Supramolecule #5: Antibody fragment ScFv16
+Supramolecule #6: Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2
+Supramolecule #7: EP67 ligand
+Macromolecule #1: Muscarinic acetylcholine receptor M4,C5a anaphylatoxin chemotacti...
+Macromolecule #2: Guanine nucleotide-binding protein G(o) subunit alpha
+Macromolecule #3: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1
+Macromolecule #4: Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2
+Macromolecule #5: Antibody fragment ScFv16
+Macromolecule #6: EP67 ligand
-Experimental details
-Structure determination
| Method | cryo EM |
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Processing | single particle reconstruction |
| Aggregation state | particle |
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Sample preparation
| Buffer | pH: 7.4 |
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| Vitrification | Cryogen name: ETHANE |
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Electron microscopy
| Microscope | TFS KRIOS |
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| Image recording | Film or detector model: GATAN K3 (6k x 4k) / Detector mode: COUNTING / Average electron dose: 48.49 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: 1.8 µm / Nominal defocus min: 0.8 µm |
| Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Image processing
-Atomic model buiding 1
| Refinement | Space: REAL / Protocol: FLEXIBLE FIT |
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| Output model | ![]() PDB-9kxs: |
Movie
Controller
About Yorodumi




Keywords
Homo sapiens (human)
Authors
India,
United Kingdom, 3 items
Citation









































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






































FIELD EMISSION GUN


