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The crystal structure of P.fluorescens Kynurenine 3-monooxygenase (KMO) in complex with competitive inhibitor No. 4The crystal structure of P.fluorescens Kynurenine 3-monooxygenase (KMO) in complex with competitive inhibitor No. 4
Structural highlights
Function[KMO_PSEFL] Catalyzes the hydroxylation of L-kynurenine (L-Kyn) to form 3-hydroxy-L-kynurenine (L-3OHKyn). Probably required for the synthesis of quinolinic acid and the siderophore quinolobactin. Publication Abstract from PubMedDysregulation of the kynurenine pathway (KP) leads to imbalances in neuroactive metabolites associated with the pathogenesis of several neurodegenerative disorders, including Huntington's disease (HD). Inhibition of the enzyme kynurenine 3-monooxygenase (KMO) in the KP normalises these metabolic imbalances and ameliorates neurodegeneration and related phenotypes in several neurodegenerative disease models. KMO is thus a promising candidate drug target for these disorders, but known inhibitors are not brain permeable. Here, 19 new KMO inhibitors have been identified. One of these (1) is neuroprotective in a Drosophila HD model but is minimally brain penetrant in mice. The prodrug variant (1b) crosses the blood-brain barrier, releases 1 in the brain, thereby lowering levels of 3-hydroxykynurenine, a toxic KP metabolite linked to neurodegeneration. Prodrug 1b will advance development of targeted therapies against multiple neurodegenerative and neuroinflammatory diseases in which KP likely plays a role, including HD, Alzheimer's disease, and Parkinson's disease. A brain-permeable inhibitor of the neurodegenerative disease target kynurenine 3-monooxygenase prevents accumulation of neurotoxic metabolites.,Zhang S, Sakuma M, Deora GS, Levy CW, Klausing A, Breda C, Read KD, Edlin CD, Ross BP, Wright Muelas M, Day PJ, O'Hagan S, Kell DB, Schwarcz R, Leys D, Heyes DJ, Giorgini F, Scrutton NS Commun Biol. 2019 Jul 24;2:271. doi: 10.1038/s42003-019-0520-5. eCollection 2019. PMID:31372510[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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