Bolgi O

References (3)

Title : Chemoproteomics-Enabled Identification of 4-Oxo-beta-Lactams as Inhibitors of Dipeptidyl Peptidases 8 and 9 - Carvalho_2022_Angew.Chem.Int.Ed.Engl_61_e202210498
Author(s) : Carvalho LAR , Ross B , Fehr L , Bolgi O , Wohrle S , Lum KM , Podlesainski D , Vieira AC , Kiefersauer R , Felix R , Rodrigues T , Lucas SD , Gross O , Geiss-Friedlander R , Cravatt BF , Huber R , Kaiser M , Moreira R
Ref : Angew Chem Int Ed Engl , : , 2022
Abstract : Dipeptidyl peptidases 8 and 9 (DPP8/9) have gathered interest as drug targets due to their important roles in biological processes like immunity and tumorigenesis. Elucidation of their distinct individual functions remains an ongoing task and could benefit from the availability of novel, chemically diverse and selective chemical tools. Here, we report the activity-based protein profiling (ABPP)-mediated discovery of 4-oxo-beta-lactams as potent, non-substrate-like nanomolar DPP8/9 inhibitors. X-ray crystallographic structures revealed different ligand binding modes for DPP8 and DPP9, including an unprecedented targeting of an extended S2' (eS2') subsite in DPP8. Biological assays confirmed inhibition at both target and cellular levels. Altogether, our integrated chemical proteomics and structure-guided small molecule design approach led to novel DPP8/9 inhibitors with alternative molecular inhibition mechanisms, delivering the highest selectivity index reported to date.
ESTHER : Carvalho_2022_Angew.Chem.Int.Ed.Engl_61_e202210498
PubMedSearch : Carvalho_2022_Angew.Chem.Int.Ed.Engl_61_e202210498
PubMedID: 36089535
Gene_locus related to this paper: human-DPP8 , human-DPP9

Title : Dipeptidyl peptidase 9 triggers BRCA2 degradation and promotes DNA damage repair - Bolgi_2022_EMBO.Rep__e54136
Author(s) : Bolgi O , Silva-Garcia M , Ross B , Pilla E , Kari V , Killisch M , Spitzner M , Stark N , Lenz C , Weiss K , Donzelli L , Gorrell MD , Grade M , Riemer J , Urlaub H , Dobbelstein M , Huber R , Geiss-Friedlander R
Ref : EMBO Rep , :e54136 , 2022
Abstract : N-terminal sequences are important sites for post-translational modifications that alter protein localization, activity, and stability. Dipeptidyl peptidase 9 (DPP9) is a serine aminopeptidase with the rare ability to cleave off N-terminal dipeptides with imino acid proline in the second position. Here, we identify the tumor-suppressor BRCA2 as a DPP9 substrate and show this interaction to be induced by DNA damage. We present crystallographic structures documenting intracrystalline enzymatic activity of DPP9, with the N-terminal Met1-Pro2 of a BRCA21-40 peptide captured in its active site. Intriguingly, DPP9-depleted cells are hypersensitive to genotoxic agents and are impaired in the repair of DNA double-strand breaks by homologous recombination. Mechanistically, DPP9 targets BRCA2 for degradation and promotes the formation of RAD51 foci, the downstream function of BRCA2. N-terminal truncation mutants of BRCA2 that mimic a DPP9 product phenocopy reduced BRCA2 stability and rescue RAD51 foci formation in DPP9-deficient cells. Taken together, we present DPP9 as a regulator of BRCA2 stability and propose that by fine-tuning the cellular concentrations of BRCA2, DPP9 alters the BRCA2 interactome, providing a possible explanation for DPP9's role in cancer.
ESTHER : Bolgi_2022_EMBO.Rep__e54136
PubMedSearch : Bolgi_2022_EMBO.Rep__e54136
PubMedID: 35912982
Gene_locus related to this paper: human-DPP8 , human-DPP9

Title : Dipeptidyl peptidase 9 triggers BRCA2 degradation by the N-degron pathway to promote DNA-damage repair - Silva-Garcia_2020_Biorxiv__
Author(s) : Silva-Garcia M , Bolgi O , Ross B , Pilla E , Kari V , Killisch M , Stark N , Lenz C , Spitzner M , Gorrell MD , Grade M , Urlaub H , Dobbelstein M , Huber R , Geiss-Friedlander R
Ref : Biorxiv , : , 2020
Abstract : Dipeptidyl peptidase 9 (DPP9) is a serine protease cleaving N-terminal dipeptides preferentially post-proline with (patho)physiological roles in the immune system and cancer. Only few DPP9 substrates are known. Here we identify an association of human DPP9 with the tumour suppressor BRCA2, a key player in repair of DNA double-strand breaks that promotes the formation of RAD51 filaments. This interaction is triggered by DNA-damage and requires access to the DPP9 active-site. We present crystallographic structures documenting the N-terminal Met1-Pro2 of a BRCA21-40 peptide captured in the DPP9 active-site. Mechanistically, DPP9 targets BRCA2 for degradation by the N-degron pathway, and promotes RAD51 foci formation. Both processes are phenocopied by BRCA2 N-terminal truncation mutants, indicating that DPP9 regulates both stability and the cellular stoichiometric interactome of BRCA2. Consistently, DPP9-deprived cells are hypersensitive to DNA-damage. Together, we identify DPP9 as a regulator of BRCA2, providing a possible explanation for DPP9 involvement in cancer development.
ESTHER : Silva-Garcia_2020_Biorxiv__
PubMedSearch : Silva-Garcia_2020_Biorxiv__
PubMedID:
Gene_locus related to this paper: human-DPP8 , human-DPP9