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TitleOligomerization of protein arginine methyltransferase 1 and its functional impact on substrate arginine methylation.
Journal, issue, pagesJ Biol Chem, Vol. 300, Issue 12, Page 107947, Year 2024
Publish dateNov 2, 2024
AuthorsTran Dang / Nadendla EswarKumar / Sunil Kumar Tripathi / Chunli Yan / Chun-Hsiung Wang / Mengtong Cao / Tanmoy Kumar Paul / Elizabeth Oladoyin Agboluaje / May P Xiong / Ivaylo Ivanov / Meng-Chiao Ho / Y George Zheng /
PubMed AbstractProtein arginine methyltransferases (PRMTs) are important posttranslational modifying enzymes in eukaryotic proteins and regulate diverse pathways from gene transcription, RNA splicing, and signal ...Protein arginine methyltransferases (PRMTs) are important posttranslational modifying enzymes in eukaryotic proteins and regulate diverse pathways from gene transcription, RNA splicing, and signal transduction to metabolism. Increasing evidence supports that PRMTs exhibit the capacity to form higher-order oligomeric structures, but the structural basis of PRMT oligomerization and its functional consequence are elusive. Herein, we revealed for the first time different oligomeric structural forms of the predominant arginine methyltransferase PRMT1 using cryo-EM, which included tetramer (dimer of dimers), hexamer (trimer of dimers), octamer (tetramer of dimers), decamer (pentamer of dimers), and also helical filaments. Through a host of biochemical assays, we showed that PRMT1 methyltransferase activity was substantially enhanced as a result of the high-ordered oligomerization. High-ordered oligomerization increased the catalytic turnover and the multimethylation processivity of PRMT1. Presence of a catalytically dead PRMT1 mutant also enhanced the activity of WT PRMT1, pointing out a noncatalytic role of oligomerization. Structural modeling demonstrates that oligomerization enhances substrate retention at the PRMT1 surface through electrostatic force. Our studies offered key insights into PRMT1 oligomerization and established that oligomerization constitutes a novel molecular mechanism that positively regulates the enzymatic activity of PRMTs in biology.
External linksJ Biol Chem / PubMed:39491649 / PubMed Central
MethodsEM (single particle) / EM (helical sym.)
Resolution2.55 - 3.56 Å
Structure data

EMDB-39745, PDB-8z2z:
PRMT1-Tetramer
Method: EM (single particle) / Resolution: 3.25 Å

EMDB-39814, PDB-8z7h:
PRMT1-Decamer
Method: EM (helical sym.) / Resolution: 3.56 Å

EMDB-39821, PDB-8z7o:
PRMT1-Filament
Method: EM (single particle) / Resolution: 3.35 Å

EMDB-44532, PDB-9bh4:
PRMT1 hexamer, Protein Arginine Methyl transferase
Method: EM (single particle) / Resolution: 2.55 Å

EMDB-44541, PDB-9bhd:
PRMT1-Octamer
Method: EM (single particle) / Resolution: 3.38 Å

EMDB-44546, PDB-9bhg:
PRMT1-Tetramer
Method: EM (single particle) / Resolution: 3.25 Å

Chemicals

ChemComp-SAH:
S-ADENOSYL-L-HOMOCYSTEINE

Source
  • homo sapiens (human)
  • Escherichia coli BL21(DE3) (bacteria)
KeywordsTRANSFERASE / tetramer / PRMT1-Decamer / PRMT1-Filament / PRMT1 oligomer / PRMT1 Octamer / PRMT1-Tetramer

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