Journal
ACS MEDICINAL CHEMISTRY LETTERS
Volume 3, Issue 3, Pages 187-192Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ml200204m
Keywords
KAT II; kynurenic acid; kynurenine aminotransferase; hydroxamic acid
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Kynurenine aminotransferase (KAT) 11 has been identified as a potential new target for the treatment of cognitive impairment associated with schizophrenia and other psychiatric disorders. Following a high-throughput screen, cyclic hydroxamic acid PF-04859989 was identified as a potent and selective inhibitor of human and rat KAT H. An X-ray crystal structure and C-13 NMR studies of PF-04859989 bound to KAT H have demonstrated that this compound forms a covalent adduct with the enzyme cofactor, pyridoxal phosphate (PLP), in the active site. In vivo pharmacokinetic and efficacy studies in rat show that PF-04859989 is a brain-penetrant, irreversible inhibitor and is capable of reducing brain kynurenic acid by 50% at a dose of 10 mg/kg (sc). Preliminary structure-activity relationship investigations have been completed and have identified the positions on this scaffold best suited to modification for further optimization of this novel series of KAT II inhibitors.
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