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PXD052965

PXD052965 is an original dataset announced via ProteomeXchange.

Dataset Summary
TitleSelective regulation of aspartyl intramembrane protease activity by calnexin
DescriptionSignal peptide peptidase-like 2c (SPPL2c) is a testis-specific aspartyl intramembrane protease that contributes to male gamete function both by catalytic and non-proteolytic mechanisms. Here, we provide an unbiased characterisation of the in vivo interactome of SPPL2c identifying the ER chaperone calnexin as novel binding partner of this enzyme. Recruitment of calnexin specifically required the N-glycosylation within the N-terminal protease-associated domain of SPPL2c. Importantly, mutation of the single glycosylation site of SPPL2c or loss of calnexin expression completely prevented SPPL2c-mediated intramembrane proteolysis of all tested substrates. By contrast and despite rather promiscuous binding of calnexin to other SPP/SPPL proteases, expression of the chaperone was exclusively required for SPPL2c-mediated proteolysis. Despite some impact on the stability of SPPL2c most presumably due to assistance in folding of the luminal domain of the protease, calnexin appeared to be recruited rather constitutively to the protease thereby boosting its catalytic activity. In summary, we describe a novel, highly specific mode of intramembrane protease regulation, highlighting the need to systematically approach control mechanisms governing the proteolytic activity of other members of the aspartyl intramembrane protease family.
HostingRepositoryPRIDE
AnnounceDate2025-05-07
AnnouncementXMLSubmission_2025-05-06_18:36:00.845.xml
DigitalObjectIdentifier
ReviewLevelPeer-reviewed dataset
DatasetOriginOriginal dataset
RepositorySupportUnsupported dataset by repository
PrimarySubmitterMarc Gentzel
SpeciesList scientific name: Mus musculus (Mouse); NCBI TaxID: 10090;
ModificationListmonohydroxylated residue
InstrumentQ Exactive HF
Dataset History
RevisionDatetimeStatusChangeLog Entry
02024-06-10 09:09:07ID requested
12025-05-06 18:36:01announced
Publication List
Contreras W, Groenendyk J, Gentzel M, Sch, ö, nberg PY, Buchholz F, Michalak M, Schr, ö, der B, Mentrup T, Selective regulation of aspartyl intramembrane protease activity by calnexin. Cell Mol Life Sci, 81(1):441(2024) [pubmed]
10.1007/s00018-024-05478-8;
Keyword List
submitter keyword: Co-IP,Signal Peptide Peptidase-Like 2c, Mouse, Calnexin, SPPL2C, Testis
Contact List
Torben Mentrup
contact affiliationInstitute of Physiological Chemistry, Technische UniversitŠt Dresden, Dresden, Germany
contact emailtorben.mentrup@tu-dresden.de
lab head
Marc Gentzel
contact affiliationMolecular Analysis - Mass Spectrometry, Center for Molecular and Cellular Bioengineering (CMCB), TU Dresden
contact emailmarc.gentzel@tu-dresden.de
dataset submitter
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