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EC 1.14.13.125 Details
show Brenda entryEC number
1.14.13.125
Accepted name
tryptophan N-monooxygenase
Reaction
L-tryptophan + 2 O2 + 2 NADPH + 2 H+ = (E)-indol-3-ylacetaldoxime + 2 NADP+ + CO2 + 3 H2O (overall reaction);;(1a) L-tryptophan + O2 + NADPH + H+ = N-hydroxy-L-tryptophan + NADP+ + H2O;;(1b) N-hydroxy-L-tryptophan + O2 + NADPH + H+ = N,N-dihydroxy-L-tryptophan + NADP+ + H2O;;(1c) N,N-dihydroxy-L-tryptophan = (E)-indol-3-ylacetaldoxime + CO2 + H2O
Other name(s)
tryptophan N-hydroxylase,
CYP79B1,
CYP79B2,
CYP79B3
Systematic name
L-tryptophan,NADPH:oxygen oxidoreductase (N-hydroxylating)
Comment
A heme-thiolate protein (P-450). This enzyme catalyses two successive N-hydroxylations of L-tryptophan, the first steps in the biosynthesis of both auxin and the indole alkaloid phytoalexin camalexin. The product of the two hydroxylations, N,N-dihydroxy-L-tryptophan, is extremely labile and dehydrates spontaneously. The dehydrated product is then subject to a decarboxylation that produces an oxime. It is still not known whether the decarboxylation is spontaneous or catalysed by the enzyme.
History
created 2011, deleted 2018
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1 Oxidoreductases
1.1 Acting on the CH-OH group of donors
1.14.13.45 created 1992, deleted 2003
