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- EMDB-61413: Cryo-EM structure of Histamine-bound Histamine receptor 4 H4R G p... -

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Entry
Database: EMDB / ID: EMD-61413
TitleCryo-EM structure of Histamine-bound Histamine receptor 4 H4R G protein complex
Map data
Sample
  • Complex: Structural basis for ligand recognition and self-activation of histamine H4 receptors
    • Protein or peptide: Guanine nucleotide-binding protein G(i) subunit alpha-1
    • Protein or peptide: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1
    • Protein or peptide: Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2
    • Protein or peptide: Histamine H4 receptor
    • Protein or peptide: ScFv16
  • Ligand: HISTAMINE
  • Ligand: PHOSPHATE ION
  • Ligand: water
KeywordsComplex / MEMBRANE PROTEIN/IMMUNE SYSTEM / MEMBRANE PROTEIN-IMMUNE SYSTEM complex
Function / homology
Function and homology information


Histamine receptors / histamine receptor activity / neurotransmitter receptor activity / adenylate cyclase-inhibiting G protein-coupled acetylcholine receptor signaling pathway / regulation of MAPK cascade / G protein-coupled receptor signaling pathway, coupled to cyclic nucleotide second messenger / regulation of eating behavior / adenylate cyclase inhibitor activity / T cell migration / positive regulation of protein localization to cell cortex ...Histamine receptors / histamine receptor activity / neurotransmitter receptor activity / adenylate cyclase-inhibiting G protein-coupled acetylcholine receptor signaling pathway / regulation of MAPK cascade / G protein-coupled receptor signaling pathway, coupled to cyclic nucleotide second messenger / regulation of eating behavior / adenylate cyclase inhibitor activity / T cell migration / positive regulation of protein localization to cell cortex / positive regulation of relaxation of smooth muscle / Adenylate cyclase inhibitory pathway / D2 dopamine receptor binding / adenylate cyclase-inhibiting serotonin receptor signaling pathway / G protein-coupled serotonin receptor binding / cellular response to forskolin / regulation of mitotic spindle organization / mast cell degranulation / chemokine-mediated signaling pathway / neuropeptide signaling pathway / Regulation of insulin secretion / response to prostaglandin E / positive regulation of cholesterol biosynthetic process / G protein-coupled receptor binding / response to peptide hormone / G-protein beta/gamma-subunit complex binding / adenylate cyclase-modulating G protein-coupled receptor signaling pathway / adenylate cyclase-inhibiting 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) / GDP binding / 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 / Cooperation of PDCL (PhLP1) and TRiC/CCT in G-protein beta folding / cellular response to prostaglandin E stimulus / 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 / adenylate cyclase-activating G protein-coupled receptor signaling pathway / GTPase binding / G protein activity / midbody / chemical synaptic transmission / Ca2+ pathway / cell cortex / 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 / G alpha (q) signalling events / Hydrolases; Acting on acid anhydrides; Acting on GTP to facilitate cellular and subcellular movement / ciliary basal body / Ras protein signal transduction / Extra-nuclear estrogen signaling / inflammatory response / G protein-coupled receptor signaling pathway / cell division / lysosomal membrane / GTPase activity / centrosome / synapse / dendrite / GTP binding / protein-containing complex binding / magnesium ion binding / signal transduction / extracellular exosome / membrane / nucleus / plasma membrane / cytosol / cytoplasm
Similarity search - Function
Histamine H4 receptor / G-protein alpha subunit, group I / G protein alpha subunit, helical insertion / G protein alpha subunit / Guanine nucleotide binding protein (G-protein), alpha subunit / G-protein alpha subunit / G-alpha domain profile. / G-protein, gamma subunit / G-protein gamma subunit domain profile. / G-protein gamma-like domain ...Histamine H4 receptor / G-protein alpha subunit, group I / G protein alpha subunit, helical insertion / G protein alpha subunit / Guanine nucleotide binding protein (G-protein), alpha subunit / G-protein alpha subunit / G-alpha domain profile. / G-protein, gamma subunit / G-protein gamma subunit domain profile. / G-protein gamma-like domain / G-protein gamma-like domain superfamily / GGL domain / G protein gamma subunit-like motifs / GGL domain / G protein beta WD-40 repeat protein / Guanine nucleotide-binding protein, beta subunit / G-protein, beta subunit / G-protein coupled receptors family 1 signature. / 7 transmembrane receptor (rhodopsin family) / G protein-coupled receptor, rhodopsin-like / GPCR, rhodopsin-like, 7TM / G-protein coupled receptors family 1 profile. / G-protein beta WD-40 repeat / WD40 repeat, conserved site / Trp-Asp (WD) repeats signature. / Trp-Asp (WD) repeats profile. / Trp-Asp (WD) repeats circular profile. / WD40 repeats / WD40 repeat / WD40-repeat-containing domain superfamily / WD40/YVTN repeat-like-containing domain superfamily / P-loop containing nucleoside triphosphate hydrolase
Similarity search - Domain/homology
Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2 / Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1 / Guanine nucleotide-binding protein G(i) subunit alpha-1 / Histamine H4 receptor
Similarity search - Component
Biological speciesHomo sapiens (human) / Mus musculus (house mouse)
Methodsingle particle reconstruction / cryo EM / Resolution: 2.58 Å
AuthorsJin S / Zhang H / Jiang Y
Funding support China, 1 items
OrganizationGrant numberCountry
National Natural Science Foundation of China (NSFC) China
CitationJournal: Acta Pharmacol Sin / Year: 2026
Title: Decoding ligand recognition and constitutive activation of histamine H3 and H4 receptors.
Authors: San-Shan Jin / Heng Zhang / Jia-Hui Yan / Can-Rong Wu / Xiao-Qing Cai / Kai Wu / Ming-Wei Wang / H Eric Xu / De-Hua Yang / Yi Jiang /
Abstract: Histamine H3 receptor (H3R) and H4 receptor (H4R) are key members of the histamine receptor family, with H3R as a potential target for narcolepsy treatments and H4R as a candidate for next-generation ...Histamine H3 receptor (H3R) and H4 receptor (H4R) are key members of the histamine receptor family, with H3R as a potential target for narcolepsy treatments and H4R as a candidate for next-generation antihistamines for inflammatory and allergic diseases. Although progress has been made in understanding the structure of histamine receptors, the detailed mechanisms of ligand recognition and receptor antagonism for H3R and H4R remain unclear. In this study, using cryo-electron microscopy, we present an inactive structure of H4R bound to a selective antagonist, adriforant, and two Gi-coupled structures of H3R and H4R in complex with histamine. Our structural and mutagenesis analyses provide insights into the selective binding of adriforant to H4R and the recognition of histamine across histamine receptors. Our findings also uncovered distinct antagonistic mechanisms for H3R and H4R and identified the role of aromatic amino acids on extracellular loop 2 in modulating the constitutive activity of H3R and H4R. These findings advance our knowledge of the functional modulation of histamine receptors, providing a foundation for the development of targeted therapeutics for neurological and immune-related disorders.
History
DepositionSep 3, 2024-
Header (metadata) releaseSep 10, 2025-
Map releaseSep 10, 2025-
UpdateJan 21, 2026-
Current statusJan 21, 2026Processing site: PDBc / Status: Released

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Structure visualization

Supplemental images

emd_61413.png

Downloads & links

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Map

FileDownload / File: emd_61413.map.gz / Format: CCP4 / Size: 91.1 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.)
0.83 Å/pix.
x 288 pix.
= 239.616 Å		0.83 Å/pix.
x 288 pix.
= 239.616 Å		0.83 Å/pix.
x 288 pix.
= 239.616 Å

Surface

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Images are generated by Spider.

Voxel sizeX=Y=Z: 0.832 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.2
Minimum - Maximum-2.4720385 - 3.9308596
Average (Standard dev.)-0.00038955416 (±0.092535555)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions288288288
Spacing288288288
CellA=B=C: 239.616 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: #2

Fileemd_61413_half_map_1.map
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Half map: #1

Fileemd_61413_half_map_2.map
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Sample components

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Entire : Structural basis for ligand recognition and self-activation of hi...

EntireName: Structural basis for ligand recognition and self-activation of histamine H4 receptors
Components
  • Complex: Structural basis for ligand recognition and self-activation of histamine H4 receptors
    • Protein or peptide: Guanine nucleotide-binding protein G(i) subunit alpha-1
    • Protein or peptide: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1
    • Protein or peptide: Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2
    • Protein or peptide: Histamine H4 receptor
    • Protein or peptide: ScFv16
  • Ligand: HISTAMINE
  • Ligand: PHOSPHATE ION
  • Ligand: water

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Supramolecule #1: Structural basis for ligand recognition and self-activation of hi...

SupramoleculeName: Structural basis for ligand recognition and self-activation of histamine H4 receptors
type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#5
Source (natural)Organism: Homo sapiens (human)

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Macromolecule #1: Guanine nucleotide-binding protein G(i) subunit alpha-1

MacromoleculeName: Guanine nucleotide-binding protein G(i) subunit alpha-1
type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 40.225801 KDa
Recombinant expressionOrganism: Trichoplusia ni (cabbage looper)
SequenceString: CTLSAEDKAA VERSKMIDRN LREDGEKAAR EVKLLLLGAG ESGKNTIVKQ MKIIHEAGYS EEECKQYKAV VYSNTIQSII AIIRAMGRL KIDFGDSARA DDARQLFVLA GAAEEGFMTA ELAGVIKRLW KDSGVQACFN RSREYQLNDS AAYYLNDLDR I AQPNYIPT ...String:
CTLSAEDKAA VERSKMIDRN LREDGEKAAR EVKLLLLGAG ESGKNTIVKQ MKIIHEAGYS EEECKQYKAV VYSNTIQSII AIIRAMGRL KIDFGDSARA DDARQLFVLA GAAEEGFMTA ELAGVIKRLW KDSGVQACFN RSREYQLNDS AAYYLNDLDR I AQPNYIPT QQDVLRTRVK TTGIVETHFT FKDLHFKMFD VGAQRSERKK WIHCFEGVTA IIFCVALSDY DLVLAEDEEM NR MHASMKL FDSICNNKWF TDTSIILFLN KKDLFEEKIK KSPLTICYPE YAGSNTYEEA AAYIQCQFED LNKRKDTKEI YTH FTCSTD TKNVQFVFDA VTDVIIKNNL KDCGLF

UniProtKB: Guanine nucleotide-binding protein G(i) subunit alpha-1

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Macromolecule #2: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1

MacromoleculeName: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1
type: protein_or_peptide / ID: 2 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 37.285734 KDa
Recombinant expressionOrganism: Trichoplusia ni (cabbage looper)
SequenceString: SELDQLRQEA EQLKNQIRDA RKACADATLS QITNNIDPVG RIQMRTRRTL RGHLAKIYAM HWGTDSRLLV SASQDGKLII WDSYTTNKV HAIPLRSSWV MTCAYAPSGN YVACGGLDNI CSIYNLKTRE GNVRVSRELA GHTGYLSCCR FLDDNQIVTS S GDTTCALW ...String:
SELDQLRQEA EQLKNQIRDA RKACADATLS QITNNIDPVG RIQMRTRRTL RGHLAKIYAM HWGTDSRLLV SASQDGKLII WDSYTTNKV HAIPLRSSWV MTCAYAPSGN YVACGGLDNI CSIYNLKTRE GNVRVSRELA GHTGYLSCCR FLDDNQIVTS S GDTTCALW DIETGQQTTT FTGHTGDVMS LSLAPDTRLF VSGACDASAK LWDVREGMCR QTFTGHESDI NAICFFPNGN AF ATGSDDA TCRLFDLRAD QELMTYSHDN IICGITSVSF SKSGRLLLAG YDDFNCNVWD ALKADRAGVL AGHDNRVSCL GVT DDGMAV ATGSWDSFLK IWN

UniProtKB: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1

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Macromolecule #3: Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2

MacromoleculeName: Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2
type: protein_or_peptide / ID: 3 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 6.375332 KDa
Recombinant expressionOrganism: Trichoplusia ni (cabbage looper)
SequenceString:
NTASIAQARK LVEQLKMEAN IDRIKVSKAA ADLMAYCEAH AKEDPLLTPV PASENPFR

UniProtKB: Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2

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Macromolecule #4: Histamine H4 receptor

MacromoleculeName: Histamine H4 receptor / type: protein_or_peptide / ID: 4 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 44.543766 KDa
Recombinant expressionOrganism: Trichoplusia ni (cabbage looper)
SequenceString: MPDTNSTINL SLSTRVTLAF FMSLVAFAIM LGNALVILAF VVDKNLRHRS SYFFLNLAIS DFFVGVISIP LYIPHTLFEW DFGKEICVF WLTTDYLLCT ASVYNIVLIS YDRYLSVSNA VSYRTQHTGV LKIVTLMVAV WVLAFLVNGP MILVSESWKD E GSECEPGF ...String:
MPDTNSTINL SLSTRVTLAF FMSLVAFAIM LGNALVILAF VVDKNLRHRS SYFFLNLAIS DFFVGVISIP LYIPHTLFEW DFGKEICVF WLTTDYLLCT ASVYNIVLIS YDRYLSVSNA VSYRTQHTGV LKIVTLMVAV WVLAFLVNGP MILVSESWKD E GSECEPGF FSEWYILAIT SFLEFVIPVI LVAYFNMNIY WSLWKRDHLS RCQSHPGLTA VSSNICGHSF RGRLSSRRSL SA STEVPAS FHSERQRRKS SLMFSSRTKM NSNTIASKMG SFSQSDSVAL HQREHVELLR ARRLAKSLAI LLGVFAVCWA PYS LFTIVL SFYSSATGPK SVWYRIAFWL QWFNSFVNPL LYPLCHKRFQ KAFLKIFCIK KQPLPSQHSR SVSS

UniProtKB: Histamine H4 receptor

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Macromolecule #5: ScFv16

MacromoleculeName: ScFv16 / type: protein_or_peptide / ID: 5 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Mus musculus (house mouse)
Molecular weightTheoretical: 26.277299 KDa
Recombinant expressionOrganism: Trichoplusia ni (cabbage looper)
SequenceString: VQLVESGGGL VQPGGSRKLS CSASGFAFSS FGMHWVRQAP EKGLEWVAYI SSGSGTIYYA DTVKGRFTIS RDDPKNTLFL QMTSLRSED TAMYYCVRSI YYYGSSPFDF WGQGTTLTVS AGGGGSGGGG SGGGGSADIV MTQATSSVPV TPGESVSISC R SSKSLLHS ...String:
VQLVESGGGL VQPGGSRKLS CSASGFAFSS FGMHWVRQAP EKGLEWVAYI SSGSGTIYYA DTVKGRFTIS RDDPKNTLFL QMTSLRSED TAMYYCVRSI YYYGSSPFDF WGQGTTLTVS AGGGGSGGGG SGGGGSADIV MTQATSSVPV TPGESVSISC R SSKSLLHS NGNTYLYWFL QRPGQSPQLL IYRMSNLASG VPDRFSGSGS GTAFTLTISR LEAEDVGVYY CMQHLEYPLT FG AGTKLEL

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Macromolecule #6: HISTAMINE

MacromoleculeName: HISTAMINE / type: ligand / ID: 6 / Number of copies: 1 / Formula: HSM
Molecular weightTheoretical: 111.145 Da
Chemical component information

ChemComp-HSM:
HISTAMINE

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Macromolecule #7: PHOSPHATE ION

MacromoleculeName: PHOSPHATE ION / type: ligand / ID: 7 / Number of copies: 1 / Formula: PO4
Molecular weightTheoretical: 94.971 Da
Chemical component information

ChemComp-PO4:
PHOSPHATE ION

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Macromolecule #8: water

MacromoleculeName: water / type: ligand / ID: 8 / Number of copies: 3 / Formula: HOH
Molecular weightTheoretical: 18.015 Da
Chemical component information

ChemComp-HOH:
WATER

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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: 7.2
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeTFS KRIOS
Image recordingFilm or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Average electron dose: 50.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: SPOT SCAN / Imaging mode: DIFFRACTION / Nominal defocus max: 1.8 µm / Nominal defocus min: 1.2 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: NONE
Final reconstructionResolution.type: BY AUTHOR / Resolution: 2.58 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 299962
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD
FSC plot (resolution estimation)

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