title: M1 aminopeptidases as drug targets: broad applications or therapeutic niche?
abstract: M1 aminopeptidase enzymes are a diverse family of metalloenzymes characterized by conserved structure and reaction specificity. Excluding viruses, M1 aminopeptidases are distributed throughout all phyla, and have been implicated in a wide range of functions including cell maintenance, growth and development, and defense. The structure and catalytic mechanism of M1 aminopeptidases are well understood, and make them ideal candidates for the design of small-molecule inhibitors. As a result, many research groups have assessed their utility as therapeutic targets for both infectious and chronic diseases of humans, and many inhibitors with a range of target specificities and potential therapeutic applications have been developed. Herein, we have aimed to address these studies, to determine whether the family of M1 aminopeptidases does in fact present a universal target for the treatment of a diverse range of human diseases. Our analysis indicates that early validation of M1 aminopeptidases as therapeutic targets is often overlooked, which prevents the enzymes from being confirmed as drug targets. This validation cannot be neglected, and needs to include a thorough characterization of enzymes' specific roles within complex physiological pathways. Furthermore, any chemical probes used in target validation must be carefully designed to ensure that specificity over the closely related enzymes has been achieved. While many drug discovery programs that target M1 aminopeptidases remain in their infancy, certain inhibitors have shown promise for the treatment of a range of conditions including malaria, hypertension, and cancer.
authors.affiliation: Biomedicine Discovery Institute, Department of Microbiology, Monash University, Melbourne, Vic., Australia.
authors.forename: Nyssa
authors.initials: N
authors.lastname: Drinkwater
authors.affiliation: Medicinal Chemistry, Monash Institute of Pharmaceutical Sciences, Monash University, Parkville, Vic., Australia.
authors.forename: Jisook
authors.initials: J
authors.lastname: Lee
authors.affiliation: Biomedicine Discovery Institute, Department of Microbiology, Monash University, Melbourne, Vic., Australia.
authors.forename: Wei
authors.initials: W
authors.lastname: Yang
authors.affiliation: Biomedicine Discovery Institute, Department of Microbiology, Monash University, Melbourne, Vic., Australia.
authors.forename: Tess R
authors.initials: TR
authors.lastname: Malcolm
authors.affiliation: Biomedicine Discovery Institute, Department of Microbiology, Monash University, Melbourne, Vic., Australia.
authors.forename: Sheena
authors.identifier: 0000-0001-6863-1106
authors.initials: S
authors.lastname: McGowan
mesh_terms: D000626:Aminopeptidases / Q000378:metabolism*; D000818:Animals; D000962:Antimalarials / Q000494:pharmacology; D000970:Antineoplastic Agents / Q000494:pharmacology; D055808:Drug Discovery; D006801:Humans
chemical_list: D000962:Antimalarials; D000970:Antineoplastic Agents; D000626:Aminopeptidases
keywords: M1 aminopeptidase; anti-cancer; anti-malarial; drug discovery; inhibitors