A putative transporter gene PtMMF1-deleted strain produces mono-acylated mannosylerythritol lipids in Pseudozyma tsukubaensis

• DOI: 10.1007/s00253-020-10961-w
• Publication Date: 2020-10-26T08:03:05Z
• Authors: Azusa Saika; Tokuma Fukuoka; Hideaki Koike; Shuhei Yamamoto; Tomohiro Sugahara; Atsushi Sogabe; Dai Kitamoto; Tomotake Morita
• Keywords: Surface-Active Agents; 0303 health sciences; 03 medical and health sciences; Basidiomycota; Chromatography, Thin Layer; Glycolipids; Ustilaginales

Mannosylerythritol lipids (MELs) are glycolipid biosurfactants produced by various yeasts. Mmf1, a putative transporter of MELs, is conserved in the MEL biosynthesis gene clusters of diverse MEL producers, including the genera Ustilago, Pseudozyma, Moesziomyces, and Sporisorium. To clarify the function of Mmf1, we generated the gene-deleted strain of P. tsukubaensis ΔPtMMF1 and evaluated its MEL production. Using thin-layer chromatography analyses, we detected most MELs produced by ΔPtMMF1 in the culture supernatant. The spot size of diacylated MEL-B (the only product of the parental strain) was significantly smaller for strain ΔPtMMF1 than for the parental strain, and a mono-acylated MEL-D spot was detected. In addition, an unknown glycolipid was detected in the sample extracted from strain ΔPtMMF1. Liquid chromatography-mass spectrometry and nuclear magnetic resonance analyses revealed that the unknown glycolipid was a novel MEL homologue, mono-acylated MEL-B. KEY POINTS: • P. tsukubaensis is able to secrete MELs without PtMMF1p. • Strain ΔPtMMF1 mainly produced mono-acylated MELs.