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• W2079199493 abstract "The tryptophan metabolite kynurenic acid (KYNA), which is produced enzymatically by the irreversible transamination of l-kynurenine, is an antagonist of alpha7 nicotinic and NMDA receptors and may thus modulate cholinergic and glutamatergic neurotransmission. Two kynurenine aminotransferases (KAT I and II) are currently considered the major biosynthetic enzymes of KYNA in the brain. In this study, we report the existence of a third enzyme displaying KAT activity in the mammalian brain. The novel KAT had a pH optimum of 8.0 and a low capacity to transaminate glutamine or alpha-aminoadipate (the classic substrates of KAT I and KAT II, respectively). The enzyme was inhibited by aspartate, glutamate, and quisqualate but was insensitive to blockade by glutamine or anti-KAT II antibodies. After purification to homogeneity, the protein was sequenced and the enzyme was identified as mitochondrial aspartate aminotransferase (mitAAT). Finally, the relative contributions of KAT I, KAT II, and mitAAT to total KAT activity were determined in mouse, rat, and human brain at physiological pH using anti-mitAAT antibodies. KAT II was most abundant in rat and human brain, while mitAAT played the major role in mouse brain. It remains to be seen if mitAAT participates in cerebral KYNA synthesis under physiological and/or pathological conditions in vivo." @default.
• W2079199493 created "2016-06-24" @default.
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• W2079199493 date "2007-03-02" @default.
• W2079199493 modified "2023-10-17" @default.
• W2079199493 title "Mitochondrial aspartate aminotransferase: a third kynurenate‐producing enzyme in the mammalian brain" @default.
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• W2079199493 doi "https://doi.org/10.1111/j.1471-4159.2007.04556.x" @default.
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