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DPP8/9 processing of human AK2 unmasks an IAP binding motif

ABSTRACT: AK2 is n-terminally processed by methionine aminopeptidases, N-terminal acetylation and DDP8/9 to become an active protein which is then sorted in the mitochondrial intermembrane space. We used peptide pull-downs of free and acetylated N-terminal peptides of AK2 from the different processing steps to identify binding partners by MS. We identified the inhibitor of apoptosis E3 ligase proteins (IAPs; BIRC2, 3, 6 and XIAP) as new binding partners for processed AK2 and show that they are responsible for AK2 degradation in the cytosol.

INSTRUMENT(S): Orbitrap Exploris 480

ORGANISM(S): Homo Sapiens (human)

TISSUE(S): Permanent Cell Line Cell, Cell Culture

SUBMITTER: Tanja Bange

LAB HEAD: Tanja Bange

PROVIDER: PXD047178 | Pride | 2025-03-13

REPOSITORIES: Pride

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			Action	DRS
	20220317_Q2_U4_1-10_AB_SA_FM1052_10.raw	Raw
	20220317_Q2_U4_1-10_AB_SA_FM1052_12.raw	Raw
	20220317_Q2_U4_1-10_AB_SA_FM1052_14.raw	Raw
	20220317_Q2_U4_1-10_AB_SA_FM1052_16.raw	Raw
	20220317_Q2_U4_1-10_AB_SA_FM1052_18.raw	Raw

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Project description:Metastatic malignant melanoma is the deadliest skin cancer type, and it is characterized by its high resistance to apoptosis. The main driving mutations in melanoma cause hyperactivation of genes within the ERK pathway, with BRAF mutations being the most frequent ones, followed by NRAS, NF1 and MEK mutations. Increasing evidence shows that the MST2/Hippo pathway is also deregulated in this cancer type. While mutations are rare, MST2/Hippo pathway core proteins expression levels are often dysregulated in melanoma. The expression of the tumour suppressor RASSF1A, a bona fide activator of the pro-apoptotic MST2 pathway, is silenced by promoter methylation in over half of melanomas and correlates with poor prognosis. Here, using mass spectrometry-based interaction proteomics we identified Second Mitochondria-derived Activator of Caspases (SMAC) as a novel LATS1 interactor. We show that RASSF1A-dependent activation of the pro-apoptotic MST2 pathway promotes LATS1-SMAC interaction and negatively regulates the anti-apoptotic signal mediated by the members of the IAP family. Moreover, proteomic experiments identified a common cluster of the apoptotic regulator that bind to SMAC and LATS1. Mechanistic analysis show that the LATS1-SMAC complex promotes XIAP ubiquitination and its subsequent degradation which ultimately results apoptosis. Importantly, we show that the oncogenic BRAFV600E mutant prevents the pro-apoptotic signal mediated by the LAST1-SMAC complex while treatment of melanoma cell lines with BRAF inhibitors promotes this complex, indicating that inhibition of the LATS1-SMAC might be necessary for BRAFV600E-driven melanoma. Finally, we show that LATS1-SMAC interaction is regulated by the SMAC mimetic Birinapant which requires the inhibition of C-IAP1 and the degradation of XIAP, indicating that the MST2/Hippo pathway is part of the mechanism of action of Birinapant. Overall, the current work shows SMAC-dependent apoptosis is regulated by the LATS1 tumour suppressor and supports the idea that LATS1 is a signalling hub that regulates the crosstalk between the MST2 pathway, the apoptotic network and the RAF/ERK pathway.

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DPP8/9 processing of human AK2 unmasks an IAP binding motif

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