Moesziomyces antarcticus MMF1 Has a Role in the Secretion of Mannosylerythritol Lipids

Area of Science:

• Microbiology
• Biochemistry
• Molecular Biology

Background:

• Mannosyl erythritol lipids (MELs) are glycolipid biosurfactants produced by Ustilaginomycete yeasts.
• The secretion mechanism of MELs in Moesziomyces antarcticus, a prolific producer, is not fully understood.
• A putative transporter, MMF1, is known to be involved in MEL secretion in Ustilago maydis.

Purpose of the Study:

• To investigate the role of the MMF1 gene in MEL secretion in Moesziomyces antarcticus.
• To determine if MMF1 is essential for MEL synthesis, secretion, growth, or cell morphology in M. antarcticus.

Main Methods:

• Gene disruption of MMF1 in M. antarcticus JCM10317 using homologous recombination.
• Analysis of MEL species accumulation and secretion in wild-type and MMF1 mutant strains.
• Phenotypic analysis of growth and cell morphology in the mutant strain.

Main Results:

• Disruption of MMF1 in M. antarcticus led to significantly reduced secretion of conventional MEL-A, MEL-B, and MEL-C.
• The MMF1 mutant secreted a distinct glycolipid species, similar to those observed in MMF1 mutants of other yeast species.
• Intracellular accumulation of MELs was not prevented by MMF1 disruption.
• No significant defects in growth or cell morphology were observed in the MMF1 mutant.

Conclusions:

• The MMF1 gene in M. antarcticus encodes a transporter essential for the secretion of conventional MELs.
• MMF1 is not required for MEL synthesis or for maintaining normal cell growth and morphology.
• This study elucidates a key component of the MEL secretion pathway in M. antarcticus.