PXD036899-1

PXD036899 is an original dataset announced via ProteomeXchange.

Title	LC-MS/MS analysis of co-immunoprecipitation products of METTL3
Description	N6-methyladenosine (m6A) methylation of mRNA by the methyltransferase complex (MTC), with core components including METTL3-METTL14 heterodimers and Wilms’ tumor 1-associated protein (WTAP), contributes to breast tumorigenesis, but the mechanism of MTC assembly remains elusive. Here, we identify a novel cleaved form METTL3a (residues 239-580 of METTL3), that is highly expressed in breast cancer. Furthermore, we find that both METTL3a and full-length METTL3 are required for MTC assembly, RNA m6A deposition, as well as cancer cell proliferation. Mechanistically, we find that METTL3a is required for METTL3-METTL3 interaction, which is a prerequisite step for recruitment of WTAP in MTC assembly. Analysis of m6A sequencing data shows that depletion of METTL3a globally disrupts m6A methylation, and METTL3a mediates mTOR activation via m6A-mediated suppression of TMEM127 expression. Consequently, we find that METTL3 cleavage is mediated by proteasome in an mTOR-dependent manner, revealing positive regulatory feedback between METTL3a and mTOR signaling. Our findings reveal METTL3a as an important component for MTC assembly, and suggest the METTL3a-mTOR axis as a potential therapeutic target for breast cancer.
HostingRepository	PRIDE
AnnounceDate	2023-08-18
AnnouncementXML	Submission_2023-08-18_05:08:22.830.xml
DigitalObjectIdentifier
ReviewLevel	Peer-reviewed dataset
DatasetOrigin	Original dataset
RepositorySupport	Unsupported dataset by repository
PrimarySubmitter	ChaojunYan
SpeciesList	scientific name: Homo sapiens (Human); NCBI TaxID: 9606;
ModificationList	No PTMs are included in the dataset
Instrument	Q Exactive HF

Revision	Datetime	Status	ChangeLog Entry
0	2022-09-21 09:37:56	ID requested
⏵ 1	2023-08-18 05:08:23	announced
2	2023-11-14 07:00:28	announced	2023-11-14: Updated project metadata.
3	2024-10-22 06:00:32	announced	2024-10-22: Updated project metadata.

submitter keyword: 293T LC-MS/MS

Jingzhang
contact affiliation	Department of Thyroid and Breast Surgery, Medical Research Institute, Frontier Science Center for Immunology and Metabolism, jing zhang lab,wuhan university, wuhan china
contact email	jing_zhang@whu.edu.cn
lab head
ChaojunYan
contact affiliation	wuhan university
contact email	ycj114@whu.edu.cn
dataset submitter

Dataset FTP location NOTE: Most web browsers have now discontinued native support for FTP access within the browser window. But you can usually install another FTP app (we recommend FileZilla) and configure your browser to launch the external application when you click on this FTP link. Or otherwise, launch an app that supports FTP (like FileZilla) and use this address: ftp://ftp.pride.ebi.ac.uk/pride/data/archive/2023/08/PXD036899

PRIDE project URI

• PRIDE
  1. PXD036899
     1. Label: PRIDE project
     2. Name: LC-MS/MS analysis of co-immunoprecipitation products of METTL3