This view shows enzymes only for those organisms listed below, in the list of taxa known to possess the pathway. If an enzyme name is shown in bold, there is experimental evidence for this enzymatic activity.
Synonyms: IAA biosynthesis from ester-conjugates, indole-3-acetic acid biosynthesis from ester-conjugates, IAA activation II
|Superclasses:||Activation/Inactivation/Interconversion → Activation|
|Biosynthesis → Hormones Biosynthesis → Plant Hormones Biosynthesis → Auxins Biosynthesis|
Some taxa known to possess this pathway include : Zea mays
Expected Taxonomic Range: Viridiplantae
The phytohormone family of auxins regulates many plant biological processes including cell division, elongation, differentiation, root initiation, tropic responses, flowering, fruit ripening, and senescence [Woodward05]. Indole-3-acetic acid (IAA) is the most abundant natural plant auxin.
In addition to de novo synthesis, IAA can be released from its conjugates. In maize, hydrolysis of IAA ester conjugates provides the major source of free IAA during seed germination and early seedling growth. IAA-myo-inositol-galactose is hydrolyzed to IAA-myo-inositol at the seed scutellum. IAA-myo-inositol can be hydrolyzed to IAA within the seed or transported to shoots where it is hydrolyzed to free IAA. Hydrolysis of IAA-glucose esters including indole-3-acetyl-β-1-D-glucose and its isomers has also been detected in endosperm.
Variants: indole-3-acetate activation I, indole-3-acetate biosynthesis I, indole-3-acetate biosynthesis II, indole-3-acetate biosynthesis III (bacteria), indole-3-acetate biosynthesis IV (bacteria), indole-3-acetate biosynthesis V (bacteria and fungi), L-tryptophan degradation VII (via indole-3-pyruvate), methyl indole-3-acetate interconversion
Chisnell88: Chisnell JR, Bandurski RS (1988). "Translocation of radiolabeled indole-3-acetic acid and indole-3-acetyl-myo-inositol from kernel to shoot of Zea mays L." Plant Physiol 86;79-84. PMID: 11538236
Kowalczyk90: Kowalczyk S, Bandurski RS (1990). "Isomerization of 1-O-indol-3-ylacetyl-beta-D-glucose. Enzymatic hydrolysis of 1-O, 4-O, and 6-O-indol-3-ylacetyl-beta-D-glucose and the enzymatic synthesis of indole-3-acetyl glycerol by a hormone metabolizing complex." Plant Physiol 94;4-12. PMID: 11537480
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