In eukaryotes 3-hydroxyanthranilic acid dioxygenase (EC:1.13.11.6) is part of the kynurenine pathway for the degradation of tryptophan and the biosynthesis of nicotinic acid [1].The prokaryotic homolog is involved in the 2-nitrobenzoate degradation pathway [2].

1: The yeast gene YJR025c encodes a 3-hydroxyanthranilic acid dioxygenase and is involved in nicotinic acid biosynthesis. Kucharczyk R, Zagulski M, Rytka J, Herbert CJ; FEBS Lett 1998;424:127-130. PMID:9539135

2: Prokaryotic homologs of the eukaryotic 3-hydroxyanthranilate 3,4-dioxygenase and 2-amino-3-carboxymuconate-6-semialdehyde decarboxylase in the 2-nitrobenzoate degradation pathway of Pseudomonas fluorescens strain KU-7. Muraki T, Taki M, Hasegawa Y, Iwaki H, Lau PC; Appl Environ Microbiol 2003;69:1564-1572. PMID:12620844

3: Crystal structure of 3-hydroxyanthranilic acid 3,4-dioxygenase from Saccharomyces cerevisiae: a special subgroup of the type III extradiol dioxygenases. Li X, Guo M, Fan J, Tang W, Wang D, Ge H, Rong H, Teng M, Niu L, Liu Q, Hao Q; Protein Sci. 2006;15:761-773. PMID:16522801