PXD067816-1

PXD067816 is an original dataset announced via ProteomeXchange.

Title	AMPK-activated BAP1 Regulates pVHL Stability and Tumor-suppressive Function
Description	The von Hippel-Lindau (VHL) protein (pVHL) functions as a potent tumor suppressor by mediating the degradation or inactivation of various substrates, including HIFα and Akt. However, pVHL is frequently downregulated in numerous cancers harboring wild-type VHL, and underlying mechanisms remains elusive. Aberrant glucose metabolism is a hallmark of cancer, driving tumor progression and therapeutic resistance. Despite this, the connection between glucose homoeostasis and pVHL turnover and functions has yet to be defined. In this study, we demonstrate that dysregulated glucose metabolism destabilizes pVHL in pancreatic ductal adenocarcinoma (PDAC), colorectal and ovarian cancer cells. Mechanistically, energy stress induced by glucose starvation, 2-deoxyglucose (2-DG), or metformin activates AMP-activated protein kinase (AMPK), which subsequently phosphorylates and activates BAP1, a deubiquitinase whose specific function in targeting pVHL for deubiquitination and stabilization had not been previously characterized. Specifically, AMPKα phosphorylates BAP1 at residues S123, S469, and S583, enhancing the interaction between BAP1 and pVHL and promoting pVHL stabilization and tumor-suppressive function both in vitro and in vivo. Conversely, disrupting BAP1 phosphorylation through AMPKα depletion or reconstitution with a phosphorylation-defective BAP1 mutant (S123A/S469A/S583A) abolishes the BAP1-pVHL interaction, leading to impaired pVHL stabilization and accelerated tumor progression in cancer cell lines and patient-derived xenograft models. Clinically, our analysis reveals a positive correlation between levels of phosphorylated AMPKα (p-AMPKα), phosphorylated Ser123-BAP1 (pSer123-BAP1), and pVHL levels in PDAC, colorectal cancer and ovarian cancer specimens. Collectively, these findings elucidate a novel mechanism linking dysregulated glucose metabolism to compromised function of the BAP1-pVHL tumor-suppressive axis. Our results suggest that therapeutic strategies designed to activate this pathway may represent a promising approach for treating cancers characterized by downregulated wild-type VHL and aberrant glucose metabolism.
HostingRepository	iProX
AnnounceDate	2025-08-28
AnnouncementXML	Submission_2025-08-28_01:28:32.751.xml
DigitalObjectIdentifier
ReviewLevel	Peer-reviewed dataset
DatasetOrigin	Original dataset
RepositorySupport	Unsupported dataset by repository
PrimarySubmitter	Mei Li
SpeciesList	scientific name: Homo sapiens; NCBI TaxID: 9606;
ModificationList	No PTMs are included in the dataset
Instrument	Q Exactive Plus

Revision	Datetime	Status	ChangeLog Entry
0	2025-08-28 01:28:15	ID requested
⏵ 1	2025-08-28 01:28:33	announced

Dataset with its publication pending

submitter keyword: pVHL, Stabilization, BAP1, Glucose metabolism, AMPKα

Tongzheng Liu
contact affiliation	Jinan University
contact email	liutongzheng@jnu.edu.cn
lab head
Mei Li
contact affiliation	Jinan University
contact email	lqd86541@stu2021.jnu.edu.cn
dataset submitter

iProX dataset URI