Article (Scientific journals)
Examining Arginase-1 Trimerization Uncovers a Promising Allosteric Site for Inhibition.
Dechenne, Juhans; Wierzbicka, Magdalena; Krimou, Reda et al.
2025In Journal of Medicinal Chemistry, 68 (2), p. 1433 - 1445
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Keywords :
Arginase; ARG1 protein, human; Enzyme Inhibitors; Humans; Mutagenesis, Site-Directed; Enzyme Inhibitors/pharmacology; Enzyme Inhibitors/chemistry; Allosteric Regulation; Arginase/antagonists & inhibitors; Arginase/metabolism; Arginase/chemistry; Allosteric Site; Protein Multimerization/drug effects; Protein Multimerization; Molecular Medicine; Drug Discovery
Abstract :
[en] Arginase-1 (ARG-1) is a promising target for cancer immunotherapy, but the small size and the highly polar nature of its catalytic site present significant challenges for inhibitor development. An alternative strategy to induce enzyme inhibition by targeting protein oligomerization has been developed recently, offering several advantages such as increased selectivity, promotion of protein degradation, and potential substoichiometric inhibition. In this study, we demonstrated that only trimeric ARG-1 is active, which was confirmed by producing monomeric arginase-1. Through in silico-driven site-directed mutagenesis, we identified an allosteric site involving five key amino acids responsible for ARG-1 trimerization. We further demonstrated the covalent modification of a key arginine residue within this pocket using phenylglyoxal disrupted ARG-1 oligomerization. Although phenylglyoxal has limited potency, it effectively supports the concept of ARG-1 inhibition via homomeric disruption, validating this allosteric targeting approach.
Disciplines :
Pharmacy, pharmacology & toxicology
Author, co-author :
Dechenne, Juhans ;  Louvain Drug Research Institute (LDRI), Medicinal Chemistry Research Group (CMFA), Université Catholique de Louvain (UCLouvain), Brussels B-1200, Belgium
Wierzbicka, Magdalena  ;  Université de Liège - ULiège > Département de pharmacie > Analyse des médicaments
Krimou, Reda;  Louvain Drug Research Institute (LDRI), Medicinal Chemistry Research Group (CMFA), Université Catholique de Louvain (UCLouvain), Brussels B-1200, Belgium
El Aakchioui, Asia;  Louvain Drug Research Institute (LDRI), Medicinal Chemistry Research Group (CMFA), Université Catholique de Louvain (UCLouvain), Brussels B-1200, Belgium
Malo Pueyo, Julia;  VIB-VUB Center for Structural Biology, Vlaams Instituut Voor Biotechnologie, Brussels B-1050, Belgium ; Brussels Center for Redox Biology, Vrije Universiteit Brussel, Brussels B-1050, Belgium ; Structural Biology Brussels, Vrije Universiteit Brussel, Brussels B-1050, Belgium
Messens, Joris;  VIB-VUB Center for Structural Biology, Vlaams Instituut Voor Biotechnologie, Brussels B-1050, Belgium ; Brussels Center for Redox Biology, Vrije Universiteit Brussel, Brussels B-1050, Belgium ; Structural Biology Brussels, Vrije Universiteit Brussel, Brussels B-1050, Belgium
Fillet, Marianne  ;  Université de Liège - ULiège > Département de pharmacie > Analyse des médicaments
Spillier, Quentin;  Louvain Drug Research Institute (LDRI), Medicinal Chemistry Research Group (CMFA), Université Catholique de Louvain (UCLouvain), Brussels B-1200, Belgium
Frédérick, Raphaël ;  Louvain Drug Research Institute (LDRI), Medicinal Chemistry Research Group (CMFA), Université Catholique de Louvain (UCLouvain), Brussels B-1200, Belgium
Language :
English
Title :
Examining Arginase-1 Trimerization Uncovers a Promising Allosteric Site for Inhibition.
Publication date :
23 January 2025
Journal title :
Journal of Medicinal Chemistry
ISSN :
0022-2623
eISSN :
1520-4804
Publisher :
American Chemical Society, United States
Volume :
68
Issue :
2
Pages :
1433 - 1445
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
FWB - Fédération Wallonie-Bruxelles
F.R.S.-FNRS - Fonds de la Recherche Scientifique
Funding text :
This work was supported by the Belgian Fonds National de la Recherche Scientifique (F.R.S.- FNRS Grant T008223F and the French Community of Belgium (ARC 21/26-115). The authors thank Gael Cobraiville for his contribution to the LC-MS experiments.
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