9E3A image
Entry Detail
PDB ID:
9E3A
EMDB ID:
Keywords:
Title:
Cryo-EM structure of PRMT5/WDR77 in complex with 6S complex (pICln PBM local refinement)
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2024-10-23
Release Date:
2025-02-19
Method Details:
Experimental Method:
Resolution:
3.36 Å
Aggregation State:
PARTICLE
Reconstruction Method:
SINGLE PARTICLE
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Protein arginine N-methyltransferase 5
Chain IDs:A (auth: J)
Chain Length:637
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:Methylosome protein WDR77
Chain IDs:B (auth: K)
Chain Length:347
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:Methylosome subunit pICln
Chain IDs:C (auth: L)
Chain Length:241
Number of Molecules:1
Biological Source:Homo sapiens
Ligand Molecules
Primary Citation
Substrate adaptors are flexible tethering modules that enhance substrate methylation by the arginine methyltransferase PRMT5.
J.Biol.Chem. 301 108165 108165 (2025)
PMID: 39793893 DOI: 10.1016/j.jbc.2025.108165

Abstact

Protein arginine methyltransferase (PRMT) 5 is an essential arginine methyltransferase responsible for the majority of cellular symmetric dimethyl-arginine marks. PRMT5 uses substrate adaptors such as pICln, RIOK1, and COPR5 to recruit and methylate a wide range of substrates. Although the substrate adaptors play important roles in substrate recognition, how they direct PRMT5 activity towards specific substrates remains incompletely understood. Using biochemistry and cryogenic electron microscopy, we show that these adaptors compete for the same binding site on PRMT5. We find that substrate adaptor and substrate complexes are bound to PRMT5 through two peptide motifs, enabling these adaptors to act as flexible tethering modules to enhance substrate methylation. Taken together, our results shed structural and mechanistic light on the PRMT5 substrate adaptor function and the biochemical nature of PRMT5 interactors.

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Primary Citation of related structures