Tryptophol 0 indole-3-acetaldehyde
Cucumber enzyme is inhibited by the reaction product, and this inhibition is reversed by oxygen but not by the substrate. Several auxins are inhibitory [A835, A957]; this undoubtedly prevents over-production of IAA.
Phaseolus vulgaris, molecular weight 56 000, requires oxygen, and forms peroxide as a second product [H554].
Phycomyces blakesleeanus enzyme, molecular weight 56 000 and optimum pH 6-8, forms indole-3-acetaldehyde and possibly peroxide. It is activated by FAD and inhibited by Hg2+ , iodoacetate, and by 4 mM indole-3-acetaldehyde [E443].
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