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- EMDB-63326: Cryo-EM structure of the histamine H1 receptor-Gi protein complex -

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Entry
Database: EMDB / ID: EMD-63326
TitleCryo-EM structure of the histamine H1 receptor-Gi protein complex
Map data
Sample
  • Complex: Histamine H1 receptor-Gi protein complex
    • 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: scFv16
    • Protein or peptide: Histamine H1 receptor,Genome polyprotein
  • Ligand: HISTAMINE
KeywordsGPCR / Class A GPCR / Histamine / G protein / Complex / MEMBRANE PROTEIN
Function / homology
Function and homology information


Histamine receptors / histamine receptor activity / regulation of vascular permeability / cellular response to histamine / G-protein activation / Activation of the phototransduction cascade / Glucagon-type ligand receptors / Thromboxane signalling through TP receptor / Sensory perception of sweet, bitter, and umami (glutamate) taste / G beta:gamma signalling through PI3Kgamma ...Histamine receptors / histamine receptor activity / regulation of vascular permeability / cellular response to histamine / G-protein activation / Activation of the phototransduction cascade / Glucagon-type ligand receptors / Thromboxane signalling through TP receptor / Sensory perception of sweet, bitter, and umami (glutamate) taste / G beta:gamma signalling through PI3Kgamma / G beta:gamma signalling through CDC42 / Cooperation of PDCL (PhLP1) and TRiC/CCT in G-protein beta folding / Activation of G protein gated Potassium channels / Inhibition of voltage gated Ca2+ channels via Gbeta/gamma subunits / Ca2+ pathway / G alpha (z) signalling events / High laminar flow shear stress activates signaling by PIEZO1 and PECAM1:CDH5:KDR in endothelial cells / Glucagon-like Peptide-1 (GLP1) regulates insulin secretion / Vasopressin regulates renal water homeostasis via Aquaporins / Adrenaline,noradrenaline inhibits insulin secretion / ADP signalling through P2Y purinoceptor 12 / G alpha (q) signalling events / G alpha (i) signalling events / Thrombin signalling through proteinase activated receptors (PARs) / Activation of G protein gated Potassium channels / G-protein activation / G beta:gamma signalling through PI3Kgamma / Prostacyclin signalling through prostacyclin receptor / G beta:gamma signalling through PLC beta / ADP signalling through P2Y purinoceptor 1 / Thromboxane signalling through TP receptor / Presynaptic function of Kainate receptors / G beta:gamma signalling through CDC42 / Inhibition of voltage gated Ca2+ channels via Gbeta/gamma subunits / G alpha (12/13) signalling events / Glucagon-type ligand receptors / G beta:gamma signalling through BTK / ADP signalling through P2Y purinoceptor 12 / Adrenaline,noradrenaline inhibits insulin secretion / Cooperation of PDCL (PhLP1) and TRiC/CCT in G-protein beta folding / Ca2+ pathway / Thrombin signalling through proteinase activated receptors (PARs) / G alpha (z) signalling events / Extra-nuclear estrogen signaling / photoreceptor outer segment membrane / G alpha (s) signalling events / G alpha (q) signalling events / host cell lipid droplet / spectrin binding / G alpha (i) signalling events / symbiont-mediated transformation of host cell / Glucagon-like Peptide-1 (GLP1) regulates insulin secretion / symbiont-mediated suppression of host TRAF-mediated signal transduction / High laminar flow shear stress activates signaling by PIEZO1 and PECAM1:CDH5:KDR in endothelial cells / Vasopressin regulates renal water homeostasis via Aquaporins / positive regulation of vasoconstriction / alkylglycerophosphoethanolamine phosphodiesterase activity / symbiont-mediated perturbation of host cell cycle G1/S transition checkpoint / G protein-coupled receptor signaling pathway, coupled to cyclic nucleotide second messenger / host cell mitochondrion / photoreceptor outer segment / 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 / cardiac muscle cell apoptotic process / symbiont-mediated suppression of host JAK-STAT cascade via inhibition of STAT1 activity / photoreceptor inner segment / symbiont-mediated suppression of host cytoplasmic pattern recognition receptor signaling pathway via inhibition of MAVS activity / cellular response to forskolin / regulation of mitotic spindle organization / ribonucleoside triphosphate phosphatase activity / bioluminescence / generation of precursor metabolites and energy / Regulation of insulin secretion / positive regulation of cholesterol biosynthetic process / negative regulation of insulin secretion / G protein-coupled receptor binding / response to peptide hormone / adenylate cyclase-inhibiting G protein-coupled receptor signaling pathway / visual learning / regulation of synaptic plasticity / adenylate cyclase-modulating G protein-coupled receptor signaling pathway / G-protein beta/gamma-subunit complex binding / centriolar satellite / memory / ADP signalling through P2Y purinoceptor 12 / Adrenaline,noradrenaline inhibits insulin secretion / GDP binding / G alpha (z) signalling events / cellular response to catecholamine stimulus / ADORA2B mediated anti-inflammatory cytokines production / adenylate cyclase-activating dopamine receptor signaling pathway / GPER1 signaling / cellular response to prostaglandin E stimulus
Similarity search - Function
Histamine H1 receptor / Hepatitus C virus, Non-structural 5a protein, C-terminal / Hepatitis C virus NS5A, 1B domain superfamily / Hepatitis C virus non-structural protein NS2, C-terminal domain / Hepatitis C virus non-structural protein NS2, N-terminal domain / Hepatitis C virus non-structural protein NS2 / HCV NS5a protein C-terminal region / Hepatitis C virus, Non-structural protein NS4b / Hepatitis C virus, Core protein, N-terminal / Hepatitis C virus core protein, chain A superfamily ...Histamine H1 receptor / Hepatitus C virus, Non-structural 5a protein, C-terminal / Hepatitis C virus NS5A, 1B domain superfamily / Hepatitis C virus non-structural protein NS2, C-terminal domain / Hepatitis C virus non-structural protein NS2, N-terminal domain / Hepatitis C virus non-structural protein NS2 / HCV NS5a protein C-terminal region / Hepatitis C virus, Non-structural protein NS4b / Hepatitis C virus, Core protein, N-terminal / Hepatitis C virus core protein, chain A superfamily / : / Hepatitis C virus non-structural protein NS4b / Hepatitis C virus capsid protein / Hepatitis C virus, Non-structural protein NS2 / Hepatitis C virus, Non-structural 5a protein / Hepatitis C virus, Non-structural 5a protein, domain 1a / Hepatitis C virus non-structural 5a, 1B domain / NS5A domain 1a superfamily / : / Hepatitis C virus non-structural 5a protein membrane anchor / Hepatitis C virus non-structural 5a zinc finger domain / Hepatitis C virus non-structural 5a domain 1b / NS3 RNA helicase, C-terminal helical domain / Hepacivirus nonstructural protein 2 (NS2) protease domain profile. / Hepatitis C virus, Non-structural protein NS4a / Hepatitis C virus non-structural protein NS4a / Hepatitis C virus, Core protein, C-terminal / Hepatitis C virus core protein / Hepatitis C virus, Non-structural protein E2/NS1 / Hepatitis C virus non-structural protein E2/NS1 / Hepatitis C virus, Envelope glycoprotein E1 / Hepatitis C virus envelope glycoprotein E1 / RNA dependent RNA polymerase, hepatitis C virus / Viral RNA dependent RNA polymerase / Hepatitis C virus, NS3 protease, Peptidase S29 / Hepatitis C virus NS3 protease / Hepacivirus/Pegivirus NS3 protease domain profile. / Green fluorescent protein, GFP / G-protein alpha subunit, group I / Green fluorescent protein-related / Green fluorescent protein / Green fluorescent protein / DEAD box, Flavivirus / Flavivirus DEAD domain / Serpentine type 7TM GPCR chemoreceptor Srsx / Guanine nucleotide binding protein (G-protein), alpha subunit / G protein alpha subunit, helical insertion / G-protein alpha subunit / G-alpha domain profile. / G protein alpha subunit / 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. / G protein-coupled receptor, rhodopsin-like / GPCR, rhodopsin-like, 7TM / G-protein coupled receptors family 1 profile. / 7 transmembrane receptor (rhodopsin family) / Superfamilies 1 and 2 helicase C-terminal domain profile. / Superfamilies 1 and 2 helicase ATP-binding type-1 domain profile. / DEAD-like helicases superfamily / Helicase, C-terminal / Helicase superfamily 1/2, ATP-binding domain / G-protein beta WD-40 repeat / Reverse transcriptase/Diguanylate cyclase domain / 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 / RNA-directed RNA polymerase, catalytic domain / RdRp of positive ssRNA viruses catalytic domain profile. / WD40/YVTN repeat-like-containing domain superfamily / Peptidase S1, PA clan, chymotrypsin-like fold / Peptidase S1, PA clan / DNA/RNA polymerase superfamily / P-loop containing nucleoside triphosphate hydrolase
Similarity search - Domain/homology
Histamine H1 receptor / Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1 / Guanine nucleotide-binding protein G(i) subunit alpha-1 / Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2 / Genome polyprotein
Similarity search - Component
Biological speciesHomo sapiens (human) / Rattus norvegicus (Norway rat) / Bos taurus (domestic cattle) / Mus musculus (house mouse)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.23 Å
AuthorsMatsuzaki Y / Sano FK / Oshima HS / Akasaka H / Kobayashi K / Tanaka T / Itoh Y / Shihoya W / Kise Y / Kusakizako T / Nureki O
Funding support Japan, 1 items
OrganizationGrant numberCountry
Japan Society for the Promotion of Science (JSPS) Japan
CitationJournal: Commun Biol / Year: 2025
Title: Structural insights into ligand recognition and G protein preferences across histamine receptors.
Authors: Yuma Matsuzaki / Fumiya K Sano / Hidetaka S Oshima / Hiroaki Akasaka / Kazuhiro Kobayashi / Tatsuki Tanaka / Yuzuru Itoh / Wataru Shihoya / Yoshiaki Kise / Tsukasa Kusakizako / Asuka Inoue / Osamu Nureki /
Abstract: Histamine exerts critical physiological roles by activating four receptor subtypes, each exhibiting a specific G protein preference. Among these, the histamine H receptor (HR) modulates chemotaxis ...Histamine exerts critical physiological roles by activating four receptor subtypes, each exhibiting a specific G protein preference. Among these, the histamine H receptor (HR) modulates chemotaxis and interferon production through G protein activation, suggesting its therapeutic potential. Despite its physiological significance, the mechanisms underlying HR signalling and G protein preference across histamine receptors remain poorly understood. Here, we present the cryo-electron microscopy structure of the HR-G complex, revealing unique mechanisms of histamine recognition and receptor activation. We further solved the structures of the histamine H receptor (HR) bound to the non-canonical G proteins G and G. Through a combination of functional and computational analyses, we identified the intracellular loop 2 as a critical determinant of G protein preference in HR and HR. Collectively, our comprehensive study revealed the structural basis for distinct mechanisms of ligand recognition and receptor activation, offering a profound insight into G protein preference across receptor subtypes.
History
DepositionJan 30, 2025-
Header (metadata) releaseJun 11, 2025-
Map releaseJun 11, 2025-
UpdateJul 23, 2025-
Current statusJul 23, 2025Processing site: PDBj / Status: Released

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Structure visualization

Supplemental images

emd_63326.png

Downloads & links

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Map

FileDownload / File: emd_63326.map.gz / Format: CCP4 / Size: 22.2 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

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AxesZ (Sec.)Y (Row.)X (Col.)
1.29 Å/pix.
x 180 pix.
= 232.4 Å		1.29 Å/pix.
x 180 pix.
= 232.4 Å		1.29 Å/pix.
x 180 pix.
= 232.4 Å

Surface

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Images are generated by Spider.

Voxel sizeX=Y=Z: 1.29111 Å
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Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.65
Minimum - Maximum-3.6330984 - 5.636098
Average (Standard dev.)0.008381492 (±0.114192374)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions180180180
Spacing180180180
CellA=B=C: 232.39998 Å
α=β=γ: 90.0 °

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Supplemental data

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Mask #1

Fileemd_63326_msk_1.map
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Half map: #2

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Sample components

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Entire : Histamine H1 receptor-Gi protein complex

EntireName: Histamine H1 receptor-Gi protein complex
Components
  • Complex: Histamine H1 receptor-Gi protein complex
    • 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: scFv16
    • Protein or peptide: Histamine H1 receptor,Genome polyprotein
  • Ligand: HISTAMINE

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Supramolecule #1: Histamine H1 receptor-Gi protein complex

SupramoleculeName: Histamine H1 receptor-Gi protein complex / 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: 40.415031 KDa
Recombinant expressionOrganism: Spodoptera frugiperda (fall armyworm)
SequenceString: MGCTLSAEDK AAVERSKMID RNLREDGEKA AREVKLLLLG AGESGKSTIV KQMKIIHEAG YSEEECKQYK AVVYSNTIQS IIAIIRAMG RLKIDFGDSA RADDARQLFV LAGAAEEGFM TAELAGVIKR LWKDSGVQAC FNRSREYQLN DSAAYYLNDL D RIAQPNYI ...String:
MGCTLSAEDK AAVERSKMID RNLREDGEKA AREVKLLLLG AGESGKSTIV KQMKIIHEAG YSEEECKQYK AVVYSNTIQS IIAIIRAMG RLKIDFGDSA RADDARQLFV LAGAAEEGFM TAELAGVIKR LWKDSGVQAC FNRSREYQLN DSAAYYLNDL D RIAQPNYI PTQQDVLRTR VKTTGIVETH FTFKDLHFKM FDVGGQRSER KKWIHCFEGV TAIIFCVALS DYDLVLAEDE EM NRMHESM KLFDSICNNK WFTDTSIILF LNKKDLFEEK IKKSPLTICY PEYAGSNTYE EAAAYIQCQF EDLNKRKDTK EIY THFTCA TDTKNVQFVF DAVTDVIIKN NLKDCGLF

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: Rattus norvegicus (Norway rat)
Molecular weightTheoretical: 38.744371 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString: MHHHHHHGSL LQSELDQLRQ EAEQLKNQIR DARKACADAT LSQITNNIDP VGRIQMRTRR TLRGHLAKIY AMHWGTDSRL LVSASQDGK LIIWDSYTTN KVHAIPLRSS WVMTCAYAPS GNYVACGGLD NICSIYNLKT REGNVRVSRE LAGHTGYLSC C RFLDDNQI ...String:
MHHHHHHGSL LQSELDQLRQ EAEQLKNQIR DARKACADAT LSQITNNIDP VGRIQMRTRR TLRGHLAKIY AMHWGTDSRL LVSASQDGK LIIWDSYTTN KVHAIPLRSS WVMTCAYAPS GNYVACGGLD NICSIYNLKT REGNVRVSRE LAGHTGYLSC C RFLDDNQI VTSSGDTTCA LWDIETGQQT TTFTGHTGDV MSLSLAPDTR LFVSGACDAS AKLWDVREGM CRQTFTGHES DI NAICFFP NGNAFATGSD DATCRLFDLR ADQELMTYSH DNIICGITSV SFSKSGRLLL AGYDDFNCNV WDALKADRAG VLA GHDNRV SCLGVTDDGM AVATGSWDSF LKIWN

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: Bos taurus (domestic cattle)
Molecular weightTheoretical: 7.547685 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString:
MASNNTASIA QARKLVEQLK MEANIDRIKV SKAAADLMAY CEAHAKEDPL LTPVPASENP FREKKFFS

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

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Macromolecule #4: scFv16

MacromoleculeName: scFv16 / type: protein_or_peptide / ID: 4 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Mus musculus (house mouse)
Molecular weightTheoretical: 27.720795 KDa
Recombinant expressionOrganism: Spodoptera frugiperda (fall armyworm)
SequenceString: DVQLVESGGG LVQPGGSRKL SCSASGFAFS SFGMHWVRQA PEKGLEWVAY ISSGSGTIYY ADTVKGRFTI SRDDPKNTLF LQMTSLRSE DTAMYYCVRS IYYYGSSPFD FWGQGTTLTV SSGGGGSGGG GSGGGGSDIV MTQATSSVPV TPGESVSISC R SSKSLLHS ...String:
DVQLVESGGG LVQPGGSRKL SCSASGFAFS SFGMHWVRQA PEKGLEWVAY ISSGSGTIYY ADTVKGRFTI SRDDPKNTLF LQMTSLRSE DTAMYYCVRS IYYYGSSPFD FWGQGTTLTV SSGGGGSGGG GSGGGGSDIV MTQATSSVPV TPGESVSISC R SSKSLLHS NGNTYLYWFL QRPGQSPQLL IYRMSNLASG VPDRFSGSGS GTAFTLTISR LEAEDVGVYY CMQHLEYPLT FG AGTKLEL KAAAASSEDL YFQ

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Macromolecule #5: Histamine H1 receptor,Genome polyprotein

MacromoleculeName: Histamine H1 receptor,Genome polyprotein / type: protein_or_peptide / ID: 5 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 90.333703 KDa
Recombinant expressionOrganism: Homo sapiens (human)
SequenceString: MKTIIALSYI FCLVFADYKD DDDKEFMSLP NSSCLLEDKM CEGNKTTMAS PQLMPLVVVL STICLVTVGL NLLVLYAVRS ERKLHTVGN LYIVSLSVAD LIVGAVVMPM NILYLLMSKW SLGRPLCLFW LSMDYVASTA SIFSVFILCI DRYRSVQQPL R YLKYRTKT ...String:
MKTIIALSYI FCLVFADYKD DDDKEFMSLP NSSCLLEDKM CEGNKTTMAS PQLMPLVVVL STICLVTVGL NLLVLYAVRS ERKLHTVGN LYIVSLSVAD LIVGAVVMPM NILYLLMSKW SLGRPLCLFW LSMDYVASTA SIFSVFILCI DRYRSVQQPL R YLKYRTKT RASATILGAW FLSFLWVIPI LGWNHFMQQT SVRREDKCET DFYDVTWFKV MTAIINFYLP TLLMLWFYAK IY KAVRQHC QHRELINRSL PSFSEIKLRP ENPKGDAKKP GKESPWEVLK RKPKDAGGGS VLKSPSQTPK EMKSPVVFSQ EDD REVDKL YCFPLDIVHM QAAAEGSSRD YVAVNRSHGQ LKTDEQGLNT HGASEISEDQ MLGDSQSFSR TDSDTTTETA PGKG KLRSG SNTGLDYIKF TWKRLRSHSR QYVSGLHMNR ERKAAKQLGF IMAAFILCWI PYFIFFMVIA FCKNCCNEHL HMFTI WLGY INSTLNPLIY PLCNENFKKT FKRILHIRSG GSGGGGSGGS SSGGGSSGGS GGGSGGSGGL EVLFQGPVSK GEELFT GVV PILVELDGDV NGHKFSVSGE GEGDATYGKL TLKFICTTGK LPVPWPTLVT TLTYGVQCFS RYPDHMKQHD FFKSAMP EG YVQERTIFFK DDGNYKTRAE VKFEGDTLVN RIELKGIDFK EDGNILGHKL EYNYNSHNVY IMADKQKNGI KVNFKIRH N IEDGSVQLAD HYQQNTPIGD GPVLLPDNHY LSTQSKLSKD PNEKRDHMVL LEFVTAAGIT LGMDELYKSG LRSHHHHHH HH

UniProtKB: Histamine H1 receptor, Genome polyprotein

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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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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 / Chamber humidity: 100 % / Chamber temperature: 277 K / Instrument: FEI VITROBOT MARK IV

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Electron microscopy

MicroscopeTFS KRIOS
Image recordingFilm or detector model: GATAN K3 (6k x 4k) / Number grids imaged: 1 / Number real images: 10248 / Average electron dose: 48.96 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal defocus max: 1.6 µm / Nominal defocus min: 0.6 µm
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

CTF correctionSoftware - Name: CTFFIND / Type: PHASE FLIPPING AND AMPLITUDE CORRECTION
Startup modelType of model: PDB ENTRY
PDB model - PDB ID:

7dfl

Final reconstructionResolution.type: BY AUTHOR / Resolution: 3.23 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 52086
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: cryoSPARC

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