PXD049996-1

PXD049996 is an original dataset announced via ProteomeXchange.

Title	Proinsulin degradation and presentation of a proinsulin B-chain autoantigen involves ER-associated protein degradation (ERAD)-enzyme UBE2G2
Description	Type 1 diabetes (T1D) is characterized by HLA class I-mediated presentation of autoantigens on the surface of pancreatic β-cells. Recognition of these autoantigens by CD8¬¬+ T cells results in the destruction of pancreatic β-cells and, consequently, insulin deficiency. Most epitopes presented at the surface of β-cells derive from the insulin precursor molecule proinsulin. The intracellular processing pathway(s) involved in the generation of these peptides are poorly defined. In this study, we show that a proinsulin B-chain antigen (PPIB5-14) originates from proinsulin molecules that are processed by ER-associated protein degradation (ERAD) and thus originate from ER-resident proteins. Furthermore, screening genes encoding for E2 ubiquitin conjugating enzymes, we identified UBE2G2 to be involved in proinsulin degradation. These results indicate that insulin-derived peptides, presented by HLA-class I molecules at the cell surface, originate from ER-resident proinsulin that has been dislocated to the cytosol for subsequent degradation. These insights into the pathway involved in the generation of insulin-derived peptides emphasize the importance of proinsulin processing in the ER to T1D pathogenesis and identify novel targets for future therapies that may cure or even prevent T1D.
HostingRepository	PRIDE
AnnounceDate	2024-03-20
AnnouncementXML	Submission_2024-03-20_09:14:39.868.xml
DigitalObjectIdentifier
ReviewLevel	Peer-reviewed dataset
DatasetOrigin	Original dataset
RepositorySupport	Unsupported dataset by repository
PrimarySubmitter	Rayman Tjokrodirijo
SpeciesList	scientific name: Homo sapiens (Human); NCBI TaxID: 9606;
ModificationList	acetylated residue; monohydroxylated residue
Instrument	Orbitrap Fusion Lumos

Revision	Datetime	Status	ChangeLog Entry
0	2024-02-21 06:56:50	ID requested
⏵ 1	2024-03-20 09:14:40	announced

Dataset with its publication pending

submitter keyword: UBE2G2,Type 1 diabetes, insulin-derived peptides, Proinsulin, HLA-class I

Peter A. van Veelen
contact affiliation	Head Proteomics Group, Leiden University Medical Center, Center for Proteomics and Metabolomics, PO Box 9600, Postal zone P1-Q, 2300 RC Leiden, The Netherlands
contact email	P.A.van_Veelen@lumc.nl
lab head
Rayman Tjokrodirijo
contact affiliation	Leiden University Medical Center, Proteomics group
contact email	R.T.N.Tjokrodirijo@lumc.nl
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/2024/03/PXD049996

PRIDE project URI

• PRIDE
  1. PXD049996
     1. Label: PRIDE project
     2. Name: Proinsulin degradation and presentation of a proinsulin B-chain autoantigen involves ER-associated protein degradation (ERAD)-enzyme UBE2G2