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- EMDB-70926: Cryo-EM structure of human PRMT5:MEP50 in complex with SAH and co... -

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Basic information

Entry
Database: EMDB / ID: EMD-70926
TitleCryo-EM structure of human PRMT5:MEP50 in complex with SAH and compounds 16-19F and HJL-1
Map data
Sample
  • Complex: Cryo-EM structure of human PRMT5:MEP50 in complex with SAH and compounds 16-19F and HJL-1
    • Protein or peptide: Protein arginine N-methyltransferase 5
    • Protein or peptide: Methylosome protein 50
  • Ligand: Etravirine
  • Ligand: S-ADENOSYL-L-HOMOCYSTEINE
  • Ligand: 8-chloro-1-[(2,4-diaminoquinazolin-7-yl)methyl]-3,4-dihydroquinolin-2(1H)-one
Keywordsarginine methyltransferase / TRANSFERASE
Function / homology
Function and homology information


positive regulation of adenylate cyclase-inhibiting dopamine receptor signaling pathway / peptidyl-arginine N-methylation / type II protein arginine methyltransferase / protein-arginine omega-N symmetric methyltransferase activity / Golgi ribbon formation / histone H4R3 methyltransferase activity / protein-arginine N-methyltransferase activity / positive regulation of mRNA splicing, via spliceosome / methylosome / positive regulation of rRNA processing ...positive regulation of adenylate cyclase-inhibiting dopamine receptor signaling pathway / peptidyl-arginine N-methylation / type II protein arginine methyltransferase / protein-arginine omega-N symmetric methyltransferase activity / Golgi ribbon formation / histone H4R3 methyltransferase activity / protein-arginine N-methyltransferase activity / positive regulation of mRNA splicing, via spliceosome / methylosome / positive regulation of rRNA processing / methyl-CpG binding / endothelial cell activation / histone H3 methyltransferase activity / regulation of mitotic nuclear division / histone methyltransferase activity / positive regulation of oligodendrocyte differentiation / negative regulation of gene expression via chromosomal CpG island methylation / negative regulation of cGAS/STING signaling pathway / E-box binding / histone methyltransferase complex / Cul4B-RING E3 ubiquitin ligase complex / negative regulation of cell differentiation / regulation of ERK1 and ERK2 cascade / liver regeneration / ribonucleoprotein complex binding / ubiquitin-like ligase-substrate adaptor activity / spliceosomal snRNP assembly / methyltransferase activity / regulation of signal transduction by p53 class mediator / circadian regulation of gene expression / DNA-templated transcription termination / Regulation of TP53 Activity through Methylation / cellular response to growth factor stimulus / protein polyubiquitination / RMTs methylate histone arginines / p53 binding / transcription corepressor activity / snRNP Assembly / ubiquitin-dependent protein catabolic process / transcription coactivator activity / chromosome / chromatin remodeling / protein heterodimerization activity / regulation of DNA-templated transcription / chromatin / Golgi apparatus / nucleoplasm / identical protein binding / nucleus / cytosol / cytoplasm
Similarity search - Function
: / Protein arginine N-methyltransferase PRMT5 / PRMT5, TIM barrel domain / PRMT5, oligomerisation domain / PRMT5 TIM barrel domain / PRMT5 oligomerisation domain / PRMT5 arginine-N-methyltransferase / PRMT5 arginine-N-methyltransferase / Protein arginine N-methyltransferase / SAM-dependent methyltransferase PRMT-type domain profile. ...: / Protein arginine N-methyltransferase PRMT5 / PRMT5, TIM barrel domain / PRMT5, oligomerisation domain / PRMT5 TIM barrel domain / PRMT5 oligomerisation domain / PRMT5 arginine-N-methyltransferase / PRMT5 arginine-N-methyltransferase / Protein arginine N-methyltransferase / SAM-dependent methyltransferase PRMT-type domain profile. / WD domain, G-beta 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 / S-adenosyl-L-methionine-dependent methyltransferase superfamily / WD40/YVTN repeat-like-containing domain superfamily
Similarity search - Domain/homology
Protein arginine N-methyltransferase 5 / Methylosome protein WDR77
Similarity search - Component
Biological speciesHomo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.1 Å
AuthorsXu X / Chi Z / Jiang W / Li C
Funding support United States, 1 items
OrganizationGrant numberCountry
National Institutes of Health/National Cancer Institute (NIH/NCI)R01CA212403 United States
CitationJournal: J Enzyme Inhib Med Chem / Year: 2026
Title: Cryo-EM structure-based discovery of etravirine as a specific inhibitor of PRMT5/pICln protein-protein interaction for prostate cancer treatment.
Authors: Zhixia Chi / Xueyong Xu / Zhihang Shen / Xuehong Deng / Bennett D Elzey / Chenglong Li / Wen Jiang / Chang-Deng Hu /
Abstract: Protein arginine methyltransferase 5 (PRMT5) is overexpressed in many cancers and correlates with poor patient survival. In prostate cancer, PRMT5 cooperates with its cofactor pICln to promote tumour ...Protein arginine methyltransferase 5 (PRMT5) is overexpressed in many cancers and correlates with poor patient survival. In prostate cancer, PRMT5 cooperates with its cofactor pICln to promote tumour growth by epigenetically activating androgen receptor (AR) expression. Using a near-atomic cryo-EM structure of PRMT5/MEP50/pICln complex, we identified a previously undefined, pICln-specific protein-protein interaction (PPI) interface on PRMT5, termed P4I. Structure-based virtual screening identified the FDA-approved compound etravirine as a binder to this site. BiFC, Co-IP, and PLA assays confirmed that etravirine disrupts PRMT5/pICln interaction. A cryo-EM structure of PRMT5/MEP50/etravirine further validated on-target binding at P4I. Functionally, etravirine reduced prostate cancer cell proliferation, inhibited tumour growth, and downregulated AR and AR-V7 expression in cells and in mouse models. These results demonstrate that the unique P4I interface is a promising therapeutic target and that etravirine serves as a proof-of-concept lead compound for exploring the potential of P4I-targeted strategies in prostate cancer.
History
DepositionJun 1, 2025-
Header (metadata) releaseJun 10, 2026-
Map releaseJun 10, 2026-
UpdateSep 16, 2026-
Current statusSep 16, 2026Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_70926.png

Downloads & links

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Map

FileDownload / File: emd_70926.map.gz / Format: CCP4 / Size: 244.1 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
0.82 Å/pix.
x 400 pix.
= 328.8 Å		0.82 Å/pix.
x 400 pix.
= 328.8 Å		0.82 Å/pix.
x 400 pix.
= 328.8 Å

Surface

Projections

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Images are generated by Spider.

Voxel sizeX=Y=Z: 0.822 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.06
Minimum - Maximum-0.22829074 - 0.44386938
Average (Standard dev.)0.0006545583 (±0.011356592)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions400400400
Spacing400400400
CellA=B=C: 328.80002 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: #2

Fileemd_70926_half_map_1.map
Projections & Slices
AxesZYX

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Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: #1

Fileemd_70926_half_map_2.map
Projections & Slices
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Sample components

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Entire : Cryo-EM structure of human PRMT5:MEP50 in complex with SAH and co...

EntireName: Cryo-EM structure of human PRMT5:MEP50 in complex with SAH and compounds 16-19F and HJL-1
Components
  • Complex: Cryo-EM structure of human PRMT5:MEP50 in complex with SAH and compounds 16-19F and HJL-1
    • Protein or peptide: Protein arginine N-methyltransferase 5
    • Protein or peptide: Methylosome protein 50
  • Ligand: Etravirine
  • Ligand: S-ADENOSYL-L-HOMOCYSTEINE
  • Ligand: 8-chloro-1-[(2,4-diaminoquinazolin-7-yl)methyl]-3,4-dihydroquinolin-2(1H)-one

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Supramolecule #1: Cryo-EM structure of human PRMT5:MEP50 in complex with SAH and co...

SupramoleculeName: Cryo-EM structure of human PRMT5:MEP50 in complex with SAH and compounds 16-19F and HJL-1
type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#2
Source (natural)Organism: Homo sapiens (human)

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Macromolecule #1: Protein arginine N-methyltransferase 5

MacromoleculeName: Protein arginine N-methyltransferase 5 / type: protein_or_peptide / ID: 1 / Number of copies: 4 / Enantiomer: LEVO / EC number: type II protein arginine methyltransferase
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 72.766664 KDa
Recombinant expressionOrganism: Spodoptera frugiperda (fall armyworm)
SequenceString: MAAMAVGGAG GSRVSSGRDL NCVPEIADTL GAVAKQGFDF LCMPVFHPRF KREFIQEPAK NRPGPQTRSD LLLSGRDWNT LIVGKLSPW IRPDSKVEKI RRNSEAAMLQ ELNFGAYLGL PAFLLPLNQE DNTNLARVLT NHIHTGHHSS MFWMRVPLVA P EDLRDDII ...String:
MAAMAVGGAG GSRVSSGRDL NCVPEIADTL GAVAKQGFDF LCMPVFHPRF KREFIQEPAK NRPGPQTRSD LLLSGRDWNT LIVGKLSPW IRPDSKVEKI RRNSEAAMLQ ELNFGAYLGL PAFLLPLNQE DNTNLARVLT NHIHTGHHSS MFWMRVPLVA P EDLRDDII ENAPTTHTEE YSGEEKTWMW WHNFRTLCDY SKRIAVALEI GADLPSNHVI DRWLGEPIKA AILPTSIFLT NK KGFPVLS KMHQRLIFRL LKLEVQFIIT GTNHHSEKEF CSYLQYLEYL SQNRPPPNAY ELFAKGYEDY LQSPLQPLMD NLE SQTYEV FEKDPIKYSQ YQQAIYKCLL DRVPEEEKDT NVQVLMVLGA GRGPLVNASL RAAKQADRRI KLYAVEKNPN AVVT LENWQ FEEWGSQVTV VSSDMREWVA PEKADIIVSE LLGSFADNEL SPECLDGAQH FLKDDGVSIP GEYTSFLAPI SSSKL YNEV RACREKDRDP EAQFEMPYVV RLHNFHQLSA PQPCFTFSHP NRDPMIDNNR YCTLEFPVEV NTVLHGFAGY FETVLY QDI TLSIRPETHS PGMFSWFPIL FPIKQPITVR EGQTICVRFW RCSNSKKVWY EWAVTAPVCS AIHNPTGRSY TIGL

UniProtKB: Protein arginine N-methyltransferase 5

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Macromolecule #2: Methylosome protein 50

MacromoleculeName: Methylosome protein 50 / type: protein_or_peptide / ID: 2 / Number of copies: 3 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 36.757246 KDa
Recombinant expressionOrganism: Spodoptera frugiperda (fall armyworm)
SequenceString: MRKETPPPLV PPAAREWNLP PNAPACMERQ LEAARYRSDG ALLLGASSLS GRCWAGSLWL FKDPCAAPNE GFCSAGVQTE AGVADLTWV GERGILVASD SGAVELWELD ENETLIVSKF CKYEHDDIVS TVSVLSSGTQ AVSGSKDICI KVWDLAQQVV L SSYRAHAA ...String:
MRKETPPPLV PPAAREWNLP PNAPACMERQ LEAARYRSDG ALLLGASSLS GRCWAGSLWL FKDPCAAPNE GFCSAGVQTE AGVADLTWV GERGILVASD SGAVELWELD ENETLIVSKF CKYEHDDIVS TVSVLSSGTQ AVSGSKDICI KVWDLAQQVV L SSYRAHAA QVTCVAASPH KDSVFLSCSE DNRILLWDTR CPKPASQIGC SAPGYLPTSL AWHPQQSEVF VFGDENGTVS LV DTKSTSC VLSSAVHSQC VTGLVFSPHS VPFLASLSED CSLAVLDSSL SELFRSQAHR DFVRDATWSP LNHSLLTTVG WDH QVVHHV VPTEPLPAPG PASVTE

UniProtKB: Methylosome protein WDR77

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Macromolecule #3: Etravirine

MacromoleculeName: Etravirine / type: ligand / ID: 3 / Number of copies: 4 / Formula: 65B
Molecular weightTheoretical: 435.277 Da

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Macromolecule #4: S-ADENOSYL-L-HOMOCYSTEINE

MacromoleculeName: S-ADENOSYL-L-HOMOCYSTEINE / type: ligand / ID: 4 / Number of copies: 4 / Formula: SAH
Molecular weightTheoretical: 384.411 Da
Chemical component information

ChemComp-SAH:
S-ADENOSYL-L-HOMOCYSTEINE

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Macromolecule #5: 8-chloro-1-[(2,4-diaminoquinazolin-7-yl)methyl]-3,4-dihydroquinol...

MacromoleculeName: 8-chloro-1-[(2,4-diaminoquinazolin-7-yl)methyl]-3,4-dihydroquinolin-2(1H)-one
type: ligand / ID: 5 / Number of copies: 4 / Formula: A1CEU
Molecular weightTheoretical: 353.806 Da

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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: 7.5
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: 54.44 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 2.0 µm / Nominal defocus min: 0.6 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: PDB ENTRY
PDB model - PDB ID:

4gqb

Final reconstructionAlgorithm: FOURIER SPACE / Resolution.type: BY AUTHOR / Resolution: 3.1 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: cryoSPARC / Number images used: 100000
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD

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