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- EMDB-23750: Human Cholecystokinin 1 receptor (CCK1R) Gq chimera (mGsqi) complex -

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Basic information

Entry
Database: EMDB / ID: EMD-23750
TitleHuman Cholecystokinin 1 receptor (CCK1R) Gq chimera (mGsqi) complex
Map dataconsensus map
Sample
  • Complex: CCK1R/CCK-8/mGsqi complex
    • Complex: G protein subunit beta-1
      • Protein or peptide: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1
    • Complex: G(sqi)-alpha/G protein subunit gamma-2
      • Protein or peptide: Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2
      • Protein or peptide: Guanine nucleotide-binding protein G(i) subunit alpha-1,Guanine nucleotide-binding protein G(s) subunit alpha isoforms short,with certain residues mutated to match Guanine nucleotide-binding protein G(q) subunit
    • Complex: CCK1R
      • Protein or peptide: Cholecystokinin receptor type A
    • Complex: CCK-8
      • Protein or peptide: Cholecystokinin-8
    • Complex: scFv16
  • Ligand: CHOLESTEROL HEMISUCCINATE
KeywordsGPCR / MEMBRANE PROTEIN / MEMBRANE PROTEIN-SIGNALING PROTEIN complex
Function / homology
Function and homology information


cholecystokinin receptor activity / cholecystokinin signaling pathway / regulation of hormone secretion / neuropeptide hormone activity / 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 ...cholecystokinin receptor activity / cholecystokinin signaling pathway / regulation of hormone secretion / neuropeptide hormone activity / 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) / eating behavior / photoreceptor outer segment membrane / spectrin binding / peptide hormone receptor binding / forebrain development / alkylglycerophosphoethanolamine phosphodiesterase activity / peptide hormone binding / PKA activation in glucagon signalling / developmental growth / hair follicle placode formation / photoreceptor outer segment / D1 dopamine receptor binding / intracellular transport / vascular endothelial cell response to laminar fluid shear stress / renal water homeostasis / activation of adenylate cyclase activity / adenylate cyclase inhibitor activity / cellular response to hormone stimulus / Hedgehog 'off' state / positive regulation of protein localization to cell cortex / digestion / T cell migration / Adenylate cyclase inhibitory pathway / adenylate cyclase-activating adrenergic receptor signaling pathway / 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 / photoreceptor inner segment / cellular response to glucagon stimulus / regulation of insulin secretion / cellular response to forskolin / axonogenesis / regulation of mitotic spindle organization / Peptide ligand-binding receptors / adenylate cyclase activator activity / trans-Golgi network membrane / Regulation of insulin secretion / negative regulation of inflammatory response to antigenic stimulus / positive regulation of cholesterol biosynthetic process / negative regulation of insulin secretion / G protein-coupled receptor binding / response to peptide hormone / hormone activity / bone development / adenylate cyclase-inhibiting G protein-coupled receptor signaling pathway / adenylate cyclase-modulating G protein-coupled receptor signaling pathway / platelet aggregation / G-protein beta/gamma-subunit complex binding / centriolar satellite / cognition / adenylate cyclase-activating G protein-coupled receptor signaling pathway / G beta:gamma signalling through PLC beta / Presynaptic function of Kainate receptors / Thromboxane signalling through TP receptor / neuron migration / Activation of G protein gated Potassium channels / Inhibition of voltage gated Ca2+ channels via Gbeta/gamma subunits / G-protein activation / Prostacyclin signalling through prostacyclin receptor / G beta:gamma signalling through CDC42 / Glucagon signaling in metabolic regulation / G beta:gamma signalling through BTK / ADP signalling through P2Y purinoceptor 12 / 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 / sensory perception of smell / cellular response to catecholamine stimulus / ADP signalling through P2Y purinoceptor 1 / ADORA2B mediated anti-inflammatory cytokines production
Similarity search - Function
Cholecystokinin-like / Gastrin/cholecystokinin peptide hormone / Gastrin/cholecystokinin, conserved site / Gastrin/cholecystokinin family / Gastrin / cholecystokinin family signature. / gastrin / cholecystokinin / caerulein family / Cholecystokinin receptor type A / Cholecystokinin A receptor, N-terminal / Cholecystokinin A receptor, N-terminal domain superfamily / Cholecystokinin A receptor, N-terminal ...Cholecystokinin-like / Gastrin/cholecystokinin peptide hormone / Gastrin/cholecystokinin, conserved site / Gastrin/cholecystokinin family / Gastrin / cholecystokinin family signature. / gastrin / cholecystokinin / caerulein family / Cholecystokinin receptor type A / Cholecystokinin A receptor, N-terminal / Cholecystokinin A receptor, N-terminal domain superfamily / Cholecystokinin A receptor, N-terminal / Cholecystokinin receptor / G-protein alpha subunit, group S / G-protein alpha subunit, group I / 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) / 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
Cholecystokinin / Cholecystokinin receptor type A / Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1 / Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2 / Guanine nucleotide-binding protein G(s) subunit alpha isoforms short / Guanine nucleotide-binding protein G(i) subunit alpha-1
Similarity search - Component
Biological speciesRattus norvegicus (Norway rat) / Homo sapiens (human) / Mus musculus (house mouse)
Methodsingle particle reconstruction / cryo EM / Resolution: 2.44 Å
AuthorsMobbs JI / Belousoff MJ
Funding support Australia, Japan, 3 items
OrganizationGrant numberCountry
Australian Research Council (ARC) Australia
National Health and Medical Research Council (NHMRC, Australia) Australia
Japan Science and Technology Japan
Citation
Journal: PLoS Biol / Year: 2021
Title: Structures of the human cholecystokinin 1 (CCK1) receptor bound to Gs and Gq mimetic proteins provide insight into mechanisms of G protein selectivity.
Authors: Jesse I Mobbs / Matthew J Belousoff / Kaleeckal G Harikumar / Sarah J Piper / Xiaomeng Xu / Sebastian G B Furness / Hari Venugopal / Arthur Christopoulos / Radostin Danev / Denise Wootten / ...Authors: Jesse I Mobbs / Matthew J Belousoff / Kaleeckal G Harikumar / Sarah J Piper / Xiaomeng Xu / Sebastian G B Furness / Hari Venugopal / Arthur Christopoulos / Radostin Danev / Denise Wootten / David M Thal / Laurence J Miller / Patrick M Sexton /
Abstract: G protein-coupled receptors (GPCRs) are critical regulators of cellular function acting via heterotrimeric G proteins as their primary transducers with individual GPCRs capable of pleiotropic ...G protein-coupled receptors (GPCRs) are critical regulators of cellular function acting via heterotrimeric G proteins as their primary transducers with individual GPCRs capable of pleiotropic coupling to multiple G proteins. Structural features governing G protein selectivity and promiscuity are currently unclear. Here, we used cryo-electron microscopy (cryo-EM) to determine structures of the cholecystokinin (CCK) type 1 receptor (CCK1R) bound to the CCK peptide agonist, CCK-8 and 2 distinct transducer proteins, its primary transducer Gq, and the more weakly coupled Gs. As seen with other Gq/11-GPCR complexes, the Gq-α5 helix (αH5) bound to a relatively narrow pocket in the CCK1R core. Surprisingly, the backbone of the CCK1R and volume of the G protein binding pocket were essentially equivalent when Gs was bound, with the Gs αH5 displaying a conformation that arises from "unwinding" of the far carboxyl-terminal residues, compared to canonically Gs coupled receptors. Thus, integrated changes in the conformations of both the receptor and G protein are likely to play critical roles in the promiscuous coupling of individual GPCRs.
#1: Journal: Biorxiv / Year: 2021
Title: Structures of the human cholecystokinin 1 (CCK1) receptor bound to Gs and Gq mimetic proteins: insight into mechanisms of G protein selectivity
Authors: Mobbs J / Belousoff MJ / Harikumar KG / Piper SJ / Xu X / Furness SGB / Venugopal H / Christopoulos A / Danev R / Wootten D / Thal DM / Miller LJ / Sexton PM
History
DepositionApr 1, 2021-
Header (metadata) releaseMay 26, 2021-
Map releaseMay 26, 2021-
UpdateMay 14, 2025-
Current statusMay 14, 2025Processing site: RCSB / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.16
  • Imaged by UCSF Chimera
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  • Surface view colored by height
  • Surface level: 0.16
  • Imaged by UCSF Chimera
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  • Surface view with fitted model
  • Atomic models: PDB-7mby
  • Surface level: 0.16
  • Imaged by UCSF Chimera
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Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

emd_23750.png

Downloads & links

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Map

FileDownload / File: emd_23750.map.gz / Format: CCP4 / Size: 125 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Annotationconsensus map
Projections & slices

Image control

Size
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AxesZ (Sec.)Y (Row.)X (Col.)
0.65 Å/pix.
x 320 pix.
= 208. Å		0.65 Å/pix.
x 320 pix.
= 208. Å		0.65 Å/pix.
x 320 pix.
= 208. Å

Surface

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Images are generated by Spider.

Voxel sizeX=Y=Z: 0.65 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.16 / Movie #1: 0.16
Minimum - Maximum-0.6606016 - 1.3572613
Average (Standard dev.)0.0021167435 (±0.032398675)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions320320320
Spacing320320320
CellA=B=C: 208.0 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z0.650.650.65
M x/y/z320320320
origin x/y/z0.0000.0000.000
length x/y/z208.000208.000208.000
α/β/γ90.00090.00090.000
start NX/NY/NZ000
NX/NY/NZ360360360
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS320320320
D min/max/mean-0.6611.3570.002

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Supplemental data

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Mask #1

Fileemd_23750_msk_1.map
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Mask #2

Fileemd_23750_msk_2.map
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Mask #3

Fileemd_23750_msk_3.map
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Additional map: receptor focused half map A

Fileemd_23750_additional_1.map
Annotationreceptor focused half map A
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Additional map: Receptor focused

Fileemd_23750_additional_2.map
AnnotationReceptor focused
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Additional map: G protein focused

Fileemd_23750_additional_3.map
AnnotationG protein focused
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Additional map: G protein focused map

Fileemd_23750_additional_4.map
AnnotationG protein focused map
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Additional map: G protein focused map

Fileemd_23750_additional_5.map
AnnotationG protein focused map
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Additional map: receptor focused half map B

Fileemd_23750_additional_6.map
Annotationreceptor focused half map B
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Half map: consensus half map 2

Fileemd_23750_half_map_1.map
Annotationconsensus half map 2
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Half map: consensus half map 1

Fileemd_23750_half_map_2.map
Annotationconsensus half map 1
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Sample components

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Entire : CCK1R/CCK-8/mGsqi complex

EntireName: CCK1R/CCK-8/mGsqi complex
Components
  • Complex: CCK1R/CCK-8/mGsqi complex
    • Complex: G protein subunit beta-1
      • Protein or peptide: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1
    • Complex: G(sqi)-alpha/G protein subunit gamma-2
      • Protein or peptide: Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2
      • Protein or peptide: Guanine nucleotide-binding protein G(i) subunit alpha-1,Guanine nucleotide-binding protein G(s) subunit alpha isoforms short,with certain residues mutated to match Guanine nucleotide-binding protein G(q) subunit
    • Complex: CCK1R
      • Protein or peptide: Cholecystokinin receptor type A
    • Complex: CCK-8
      • Protein or peptide: Cholecystokinin-8
    • Complex: scFv16
  • Ligand: CHOLESTEROL HEMISUCCINATE

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Supramolecule #1: CCK1R/CCK-8/mGsqi complex

SupramoleculeName: CCK1R/CCK-8/mGsqi complex / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#5 / Details: CCK1R/CCK-8/mGsqi/Gb1/Gg2/scfv16
Molecular weightTheoretical: 150 kDa/nm

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Supramolecule #2: G protein subunit beta-1

SupramoleculeName: G protein subunit beta-1 / type: complex / ID: 2 / Parent: 1 / Macromolecule list: #1
Source (natural)Organism: Rattus norvegicus (Norway rat)

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Supramolecule #3: G(sqi)-alpha/G protein subunit gamma-2

SupramoleculeName: G(sqi)-alpha/G protein subunit gamma-2 / type: complex / ID: 3 / Parent: 1 / Macromolecule list: #2, #5
Source (natural)Organism: Homo sapiens (human)

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Supramolecule #4: CCK1R

SupramoleculeName: CCK1R / type: complex / ID: 4 / Parent: 1 / Macromolecule list: #4
Source (natural)Organism: Homo sapiens (human)

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Supramolecule #5: CCK-8

SupramoleculeName: CCK-8 / type: complex / ID: 5 / Parent: 1 / Macromolecule list: #3
Source (natural)Organism: Homo sapiens (human) / Synthetically produced: Yes

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Supramolecule #6: scFv16

SupramoleculeName: scFv16 / type: complex / ID: 6 / Parent: 1
Source (natural)Organism: Mus musculus (house mouse)

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Macromolecule #1: 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: 1 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Rattus norvegicus (Norway rat)
Molecular weightTheoretical: 37.41693 KDa
Recombinant expressionOrganism: Trichoplusia ni (cabbage looper)
SequenceString: MSELDQLRQE AEQLKNQIRD ARKACADATL SQITNNIDPV GRIQMRTRRT LRGHLAKIYA MHWGTDSRLL VSASQDGKLI IWDSYTTNK VHAIPLRSSW VMTCAYAPSG NYVACGGLDN ICSIYNLKTR EGNVRVSREL AGHTGYLSCC RFLDDNQIVT S SGDTTCAL ...String:
MSELDQLRQE AEQLKNQIRD ARKACADATL SQITNNIDPV GRIQMRTRRT LRGHLAKIYA MHWGTDSRLL VSASQDGKLI IWDSYTTNK VHAIPLRSSW VMTCAYAPSG NYVACGGLDN ICSIYNLKTR EGNVRVSREL AGHTGYLSCC RFLDDNQIVT S SGDTTCAL WDIETGQQTT TFTGHTGDVM SLSLAPDTRL FVSGACDASA KLWDVREGMC RQTFTGHESD INAICFFPNG NA FATGSDD ATCRLFDLRA DQELMTYSHD NIICGITSVS FSKSGRLLLA GYDDFNCNVW DALKADRAGV LAGHDNRVSC LGV TDDGMA VATGSWDSFL KIWN

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

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Macromolecule #2: 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: 2 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 7.861143 KDa
Recombinant expressionOrganism: Trichoplusia ni (cabbage looper)
SequenceString:
MASNNTASIA QARKLVEQLK MEANIDRIKV SKAAADLMAY CEAHAKEDPL LTPVPASENP FREKKFFCAI L

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

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Macromolecule #3: Cholecystokinin-8

MacromoleculeName: Cholecystokinin-8 / type: protein_or_peptide / ID: 3 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 1.142262 KDa
SequenceString:
D(TYS)MGWMDF(NH2)

UniProtKB: Cholecystokinin

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Macromolecule #4: Cholecystokinin receptor type A

MacromoleculeName: Cholecystokinin receptor type A / type: protein_or_peptide / ID: 4 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 47.754867 KDa
Recombinant expressionOrganism: Trichoplusia ni (cabbage looper)
SequenceString: DVVDSLLVNG SNITPPCELG LENETLFCLD QPRPSKEWQP AVQILLYSLI FLLSVLGNTL VITVLIRNKR MRTVTNIFLL SLAVSDLML CLFCMPFNLI PNLLKDFIFG SAVCKTTTYF MGTSVSVSTF NLVAISLERY GAICKPLQSR VWQTKSHALK V IAATWCLS ...String:
DVVDSLLVNG SNITPPCELG LENETLFCLD QPRPSKEWQP AVQILLYSLI FLLSVLGNTL VITVLIRNKR MRTVTNIFLL SLAVSDLML CLFCMPFNLI PNLLKDFIFG SAVCKTTTYF MGTSVSVSTF NLVAISLERY GAICKPLQSR VWQTKSHALK V IAATWCLS FTIMTPYPIY SNLVPFTKNN NQTANMCRFL LPNDVMQQSW HTFLLLILFL IPGIVMMVAY GLISLELYQG IK FEASQKK SAKERKPSTT SSGKYEDSDG CYLQKTRPPR KLELRQLSTG SSSRANRIRS NSSAANLMAK KRVIRMLIVI VVL FFLCWM PIFSANAWRA YDTASAERRL SGTPISFILL LSYTSSCVNP IIYCFMNKRF RLGFMATFPC CPNPGPPGAR GEVG EEEEG GTTGASLSRF SYSHMSASVP PQ

UniProtKB: Cholecystokinin receptor type A

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Macromolecule #5: Guanine nucleotide-binding protein G(i) subunit alpha-1,Guanine n...

MacromoleculeName: Guanine nucleotide-binding protein G(i) subunit alpha-1,Guanine nucleotide-binding protein G(s) subunit alpha isoforms short,with certain residues mutated to match Guanine nucleotide-binding protein G(q) subunit
type: protein_or_peptide / ID: 5 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 29.144971 KDa
Recombinant expressionOrganism: Trichoplusia ni (cabbage looper)
SequenceString: HHHHHHHHGC TLSAEDKAAV ERSKMIDRNL REDGEKARRT LRLLLLGADN SGKSTIVKQM RILHGGSGGS GGTSGIFETK FQVDKVNFH MFDVGGQRDE RRKWIQCFND VTAIIFVVDS SDYNRLQEAL NDFKSIWNNR WLRTISVILF LNKQDLLAEK V LAGKSKIE ...String:
HHHHHHHHGC TLSAEDKAAV ERSKMIDRNL REDGEKARRT LRLLLLGADN SGKSTIVKQM RILHGGSGGS GGTSGIFETK FQVDKVNFH MFDVGGQRDE RRKWIQCFND VTAIIFVVDS SDYNRLQEAL NDFKSIWNNR WLRTISVILF LNKQDLLAEK V LAGKSKIE DYFPEFARYT TPEDATPEPG EDPRVTRAKY FIRKEFVDIS TASGDGRHIC YPHFTCAVDT ENARRIFNDC KD IILQMNL REYNLV

UniProtKB: Guanine nucleotide-binding protein G(i) subunit alpha-1, Guanine nucleotide-binding protein G(s) subunit alpha isoforms short, Guanine nucleotide-binding protein G(s) subunit alpha isoforms short

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Macromolecule #6: CHOLESTEROL HEMISUCCINATE

MacromoleculeName: CHOLESTEROL HEMISUCCINATE / type: ligand / ID: 6 / Number of copies: 1 / Formula: Y01
Molecular weightTheoretical: 486.726 Da
Chemical component information

ChemComp-Y01:
CHOLESTEROL HEMISUCCINATE

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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

MicroscopeTFS KRIOS
Image recordingFilm or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Average electron dose: 63.9 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD
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: INSILICO MODEL
Final reconstructionResolution.type: BY AUTHOR / Resolution: 2.44 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 444000
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD

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