PXD037425

PXD037425 is an original dataset announced via ProteomeXchange.

Title	Enhanced Proteomic Mapping of Arginine Methylation Using Electron Transfer Dissociation Reveals Novel PRMT5 Substrates and Arginine Trimethylation
Description	PRMT5 is the major enzyme that catalyzes the symmetric dimethylation of arginine (sDMA) in mammalian cells. Its activity is crucial for many biological processes including transcriptional regulation, mRNA processing, as well as DNA damage and repair. However, the protein substrates identified for PRMT5 have yet been limited in numbers, hindering the understanding of PRMT5 functions in normal as well as diseased cells. Herein we developed an optimized strategy for proteomic profiling of cellular sDMA and apply it to the discovery of novel PRMT5 substrates. Our results show that a combination of proteolytic digestion by the metalloprotease ulilysin and using electron-transfer dissociation with supplemental activation as the mass spectrometry method significantly increased sDMA site identification and localization after immuno-affinity enrichment. By employing SILAC-based differential quantitative proteomic approach and a PRMT5 specific inhibitor, we identified 325 sDMA sites being regulated by PRMT5, 220 being novel sites, which greatly expanded the number of PRMT5 substrates. Biochemical studies confirmed the newly discovered PRMT5 substrate, Plasminogen activator inhibitor 1 RNA-binding protein (SERBP1) and revealed that the RGG/RG motif in the central region of SERBP1 contains both PRMT5-catalyzed sDMA and Type I PRMT-catalyzed asymmetric dimethylation of arginine (aDMA). Unexpectedly, using the optimized methylarginine profiling strategy, we also discovered arginine trimethylation, a previously unknown type of modification, on the central RGG/RG region of SERBP1. By mutational studies we demonstrated that the trimethyl modification on R172 of SERBP1 regulates its recruitment to stress granule (SG) under oxidative stress, indicating a functional role of arginine trimethylation in the cell. Overall, the optimized profiling strategy not only enabled the identification of extensive, non-overlapping sDMA sites and novel PRMT5 substrates, but also revealed a potentially important new PTM, arginine trimethylation. The work lays the foundation for further investigations on the functional interplay of different methylation modifications on arginines, especially in the heavily methylated RGG/RG motif of many RNA-binding proteins.
HostingRepository	PRIDE
AnnounceDate	2024-04-30
AnnouncementXML	Submission_2024-04-29_18:06:27.193.xml
DigitalObjectIdentifier
ReviewLevel	Peer-reviewed dataset
DatasetOrigin	Original dataset
RepositorySupport	Unsupported dataset by repository
PrimarySubmitter	Zilu Ye
SpeciesList	scientific name: Homo sapiens (Human); NCBI TaxID: 9606;
ModificationList	No PTMs are included in the dataset
Instrument	Orbitrap Fusion Lumos

Revision	Datetime	Status	ChangeLog Entry
0	2022-10-14 06:43:11	ID requested
⏵ 1	2024-04-29 18:06:27	announced

10.1021/ACS.JPROTEOME.3C00724;

submitter keyword: PRMT5, ETD,Methylation, Proteomics

Jesper Olsen
contact affiliation	University of Copenhagen Faculty of Health and Medical Sciences Novo Nordisk Foundation Center for Protein Research Proteomics Program
contact email	jesper.olsen@cpr.ku.dk
lab head
Zilu Ye
contact affiliation	University of Copenhagen
contact email	yezlandss@gmail.com
dataset submitter

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PRIDE project URI

• PRIDE
  1. PXD037425
     1. Label: PRIDE project
     2. Name: Enhanced Proteomic Mapping of Arginine Methylation Using Electron Transfer Dissociation Reveals Novel PRMT5 Substrates and Arginine Trimethylation