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Reaction schemes of 3-HK-4-methyltransferase (AcmI or AcmL) and of 3-HA-4-methyltransferase (HAMT) in the formation of 4-MHA. The upper scheme includes the pathway specific conversion of 4-MHK to 4-MHA, whereas the lower scheme includes nonpathway specific methylation step prior conversion of 3-HK to 3-HA.
Abbreviations: 4-MHA, 3-hydroxy-4-methylanthranilic acid; 3-HK, 3-hydroxykynurenine; 4-MHK, 3-hydroxy-4-methylkynurenine.
