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- PDB-7urc: Human PORCN in complex with LGK974 -

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Basic information

Entry
Database: PDB / ID: 7urc
TitleHuman PORCN in complex with LGK974
Components
  • 2C11 heavy chain
  • 2C11 light chain
  • Isoform 2 of Protein-serine O-palmitoleoyltransferase porcupine
KeywordsTRANSFERASE/TRANSFERASE INHIBITOR / Inhibitor-bound / complex / TRANSFERASE / TRANSFERASE-TRANSFERASE INHIBITOR complex
Function / homology
Function and homology information


[Wnt protein] O-palmitoleoyl transferase / protein palmitoleylation / palmitoleoyltransferase activity / LGK974 inhibits PORCN / protein lipidation / Wnt protein secretion / lipid modification / glycoprotein metabolic process / WNT ligand biogenesis and trafficking / Wnt-protein binding ...[Wnt protein] O-palmitoleoyl transferase / protein palmitoleylation / palmitoleoyltransferase activity / LGK974 inhibits PORCN / protein lipidation / Wnt protein secretion / lipid modification / glycoprotein metabolic process / WNT ligand biogenesis and trafficking / Wnt-protein binding / AMPA glutamate receptor complex / regulation of postsynaptic membrane neurotransmitter receptor levels / Wnt signaling pathway / endoplasmic reticulum membrane / glutamatergic synapse / endoplasmic reticulum / membrane
Similarity search - Function
: / Membrane bound O-acyl transferase, MBOAT / MBOAT, membrane-bound O-acyltransferase family
Similarity search - Domain/homology
CHOLESTEROL / Chem-O50 / Protein-serine O-palmitoleoyltransferase porcupine
Similarity search - Component
Biological speciesHomo sapiens (human)
Mus musculus (house mouse)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.14 Å
AuthorsLiu, Y. / Qi, X. / Li, X.
Funding support United States, 2items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS) United States
Welch Foundation United States
CitationJournal: Nature / Year: 2022
Title: Mechanisms and inhibition of Porcupine-mediated Wnt acylation.
Authors: Yang Liu / Xiaofeng Qi / Linda Donnelly / Nadia Elghobashi-Meinhardt / Tao Long / Rich W Zhou / Yingyuan Sun / Boyuan Wang / Xiaochun Li /
Abstract: Wnt signalling is essential for regulation of embryonic development and adult tissue homeostasis, and aberrant Wnt signalling is frequently associated with cancers. Wnt signalling requires ...Wnt signalling is essential for regulation of embryonic development and adult tissue homeostasis, and aberrant Wnt signalling is frequently associated with cancers. Wnt signalling requires palmitoleoylation on a hairpin 2 motif by the endoplasmic reticulum-resident membrane-bound O-acyltransferase Porcupine (PORCN). This modification is indispensable for Wnt binding to its receptor Frizzled, which triggers signalling. Here we report four cryo-electron microscopy structures of human PORCN: the complex with the palmitoleoyl-coenzyme A (palmitoleoyl-CoA) substrate; the complex with the PORCN inhibitor LGK974, an anti-cancer drug currently in clinical trials; the complex with LGK974 and WNT3A hairpin 2 (WNT3Ap); and the complex with a synthetic palmitoleoylated WNT3Ap analogue. The structures reveal that hairpin 2 of WNT3A, which is well conserved in all Wnt ligands, inserts into PORCN from the lumenal side, and the palmitoleoyl-CoA accesses the enzyme from the cytosolic side. The catalytic histidine triggers the transfer of the unsaturated palmitoleoyl group to the target serine on the Wnt hairpin 2, facilitated by the proximity of the two substrates. The inhibitor-bound structure shows that LGK974 occupies the palmitoleoyl-CoA binding site to prevent the reaction. Thus, this work provides a mechanism for Wnt acylation and advances the development of PORCN inhibitors for cancer treatment.
History
DepositionApr 21, 2022Deposition site: RCSB / Processing site: RCSB
Revision 1.0Jul 20, 2022Provider: repository / Type: Initial release
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Revision 1.1Aug 3, 2022Group: Database references / Category: citation / citation_author
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Revision 1.3Oct 23, 2024Group: Data collection / Structure summary
Category: chem_comp_atom / chem_comp_bond ...chem_comp_atom / chem_comp_bond / em_admin / pdbx_entry_details / pdbx_modification_feature
Item: _em_admin.last_update / _pdbx_entry_details.has_protein_modification
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Revision 1.1May 21, 2025Data content type: EM metadata / Data content type: EM metadata / EM metadata / Group: Data processing / Experimental summary / Data content type: EM metadata / EM metadata / Category: em_admin / em_software / Data content type: EM metadata / EM metadata / Item: _em_admin.last_update / _em_software.name

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Isoform 2 of Protein-serine O-palmitoleoyltransferase porcupine
L: 2C11 light chain
H: 2C11 heavy chain
hetero molecules


Theoretical massNumber of molelcules
Total (without water)110,60315
Polymers105,4313
Non-polymers5,17112
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: gel filtration
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

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Protein , 1 types, 1 molecules A

#1: Protein Isoform 2 of Protein-serine O-palmitoleoyltransferase porcupine / Protein MG61


Mass: 52824.652 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: PORCN, MG61, PORC, PPN / Production host: Homo sapiens (human)
References: UniProt: Q9H237, [Wnt protein] O-palmitoleoyl transferase

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Antibody , 2 types, 2 molecules LH

#2: Antibody 2C11 light chain


Mass: 25673.693 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Mus musculus (house mouse) / Production host: Homo sapiens (human)
#3: Antibody 2C11 heavy chain


Mass: 26933.135 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Mus musculus (house mouse) / Production host: Homo sapiens (human)

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Non-polymers , 4 types, 12 molecules

#4: Chemical ChemComp-O50 / 2-[(2P)-2',3-dimethyl[2,4'-bipyridin]-5-yl]-N-[(5P)-5-(pyrazin-2-yl)pyridin-2-yl]acetamide


Mass: 396.445 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C23H20N6O / Feature type: SUBJECT OF INVESTIGATION
#5: Chemical
ChemComp-CLR / CHOLESTEROL


Mass: 386.654 Da / Num. of mol.: 9 / Source method: obtained synthetically / Formula: C27H46O
#6: Chemical ChemComp-AJP / Digitonin


Mass: 1229.312 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C56H92O29 / Comment: detergent*YM
#7: Chemical ChemComp-ZN / ZINC ION


Mass: 65.409 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: Zn

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Details

Has ligand of interestY
Has protein modificationY

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

Component
IDNameTypeEntity IDParent-IDSource
1LGK974-bound human PORCNCOMPLEX#1-#30RECOMBINANT
2Isoform 2 of Protein-serine O-palmitoleoyltransferase porcupine (E.C.2.3.1.250)COMPLEX#11RECOMBINANT
32C11 light chain, 2C11 heavy chainCOMPLEX#2-#31RECOMBINANT
Source (natural)
IDEntity assembly-IDOrganismNcbi tax-ID
12Homo sapiens (human)9606
23Mus musculus (house mouse)10090
Source (recombinant)
IDEntity assembly-IDOrganismNcbi tax-ID
12Homo sapiens (human)9606
23Homo sapiens (human)9606
Buffer solutionpH: 7.5
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 2000 nm / Nominal defocus min: 1000 nm
Image recordingElectron dose: 8.5 e/Å2 / Film or detector model: GATAN K3 (6k x 4k)

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Processing

SoftwareName: PHENIX / Version: 1.16_3549: / Classification: refinement
EM softwareName: PHENIX / Category: model refinement
CTF correctionType: NONE
3D reconstructionResolution: 3.14 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 100636 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.0045762
ELECTRON MICROSCOPYf_angle_d0.8177904
ELECTRON MICROSCOPYf_dihedral_angle_d5.9283144
ELECTRON MICROSCOPYf_chiral_restr0.086917
ELECTRON MICROSCOPYf_plane_restr0.004898

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