Mycobiology.  2019 Sep;47(3):292-300. 10.1080/12298093.2019.1638672.

Biosynthetic Pathway of Indole-3-Acetic Acid in Basidiomycetous Yeast Rhodosporidiobolus fluvialis

• Bunsangiam S
• Sakpuntoon V
• Srisuk N
• Ohashi T
• Fujiyama K
• Limtong S

• KMID: 2470140
• DOI: http://doi.org/10.1080/12298093.2019.1638672

Abstract

IAA biosynthetic pathways in a basidiomycetous yeast, Rhodosporidiobolus fluvialis DMKU-CP293, were investigated. The yeast strain showed tryptophan (Trp)-dependent IAA biosynthesis when grown in tryptophan supplemented mineral salt medium. Gas chromatography-mass spectrometry was used to further identify the pathway intermediates of Trp-dependent IAA biosynthesis. The results indicated that the main intermediates produced by R. fluvialis DMKU-CP293 were tryptamine (TAM), indole-3-acetic acid (IAA), and tryptophol (TOL), whereas indole-3-pyruvic acid (IPA) was not found. However, supplementation of IPA to the culture medium resulted in IAA peak detection by high-performance liquid chromatography analysis of the culture supernatant. Key enzymes of three IAA biosynthetic routes, i.e., IPA, IAM and TAM were investigated to clarify the IAA biosynthetic pathways of R. fluvialis DMKU-CP293. Results indicated that the activities of tryptophan aminotransferase, tryptophan 2-monooxygenase, and tryptophan decarboxylase were observed in cell crude extract. Overall results suggested that IAA biosynthetic in this yeast strain mainly occurred via the IPA route. Nevertheless, IAM and TAM pathway might be involved in R. fluvialis DMKU-CP293.

Keyword

Indole-3-acetic acid; IAA biosynthesis; basidiomycetous yeast; Rhodosporidiobolus fluvialis

MeSH Terms

Aromatic-L-Amino-Acid Decarboxylases
Biosynthetic Pathways*
Chromatography, Liquid
Miners
Spectrum Analysis
Tryptophan
Tryptophan Transaminase
Yeasts*
Aromatic-L-Amino-Acid Decarboxylases
Tryptophan
Tryptophan Transaminase