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

Sakaoduoen Bunsangiam; Varunya Sakpuntoon; Nantana Srisuk; Takao Ohashi; Kazuhito Fujiyama; Savitree Limtong

doi:10.1080/12298093.2019.1638672

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

Mycobiology. 2019 Jul 15;47(3):292-300. doi: 10.1080/12298093.2019.1638672. eCollection 2019.

Authors

Sakaoduoen Bunsangiam¹, Varunya Sakpuntoon¹, Nantana Srisuk¹, Takao Ohashi², Kazuhito Fujiyama², Savitree Limtong¹

Affiliations

¹ Department of Microbiology, Faculty of Science, Kasetsart University, Chatuchak, Bangkok, Thailand.
² International Center for Biotechnology, Osaka University, Osaka, Japan.

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.

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

Grants and funding

This work was supported by the Thailand Research Fund through the TRF Research-Team Promotion Grant (RTA608004) and the Royal Golden Jubilee PhD programme grant no. PHD/0125/2559, Thailand.