Characterization of Yeast Extracellular Vesicles: Evidence for the Participation of Different Pathways of Cellular Traffic in Vesicle Biogenesis

Background: Extracellular vesicles in yeast cells are involved in the molecular traffic across the cell wall. In yeast pathogens, these vesicles have been implicated in the transport of proteins, lipids, polysaccharide and pigments to the extracellular space. Cellular pathways required for the biogenesis of yeast extracellular vesicles are largely unknown. Methodology/Principal Findings: We characterized extracellular vesicle production in wild type (WT) and mutant strains of the model yeast Saccharomyces cerevisiae using transmission electron microscopy in combination with light scattering analysis, lipid extraction and proteomics. WT cells and mutants with defective expression of Sec4p, a secretory vesicle-associated Rab GTPase essential for Golgi-derived exocytosis, or Snf7p, which is involved in multivesicular body (MVB) formation, were analyzed in parallel. Bilayered vesicles with diameters at the 100-300 nm range were found in extracellular fractions from yeast cultures. Proteomic analysis of vesicular fractions from the cells aforementioned and additional mutants with defects in conventional secretion pathways (sec1-1, fusion of Golgi-derived exocytic vesicles with the plasma membrane; bos1-1, vesicle targeting to the Golgi complex) or MVB functionality (vps23, late endosomal trafficking) revealed a complex and interrelated protein collection. Semi-quantitative analysis of protein abundance revealed that mutations in both MVB- and Golgi-derived pathways affected the composition of yeast extracellular vesicles, but none abrogated vesicle production. Lipid analysis revealed that mutants with defects in Golgi-related components of the secretory pathway had slower vesicle release kinetics, as inferred from intracellular accumulation of sterols and reduced detection of these lipids in vesicle fractions in comparison with WT cells. Conclusions/Significance: Our results suggest that both conventional and unconventional pathways of secretion are required for biogenesis of extracellular vesicles, which demonstrate the complexity of this process in the biology of yeast cells.

Brazilian agencies Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq)

Fundacao de Amparo a Pesquisa do Estado do Rio de Janeiro (FAPERJ)

Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES)

NIH[HL059842]

NIH[AI033774]

NIH[AI052733]

NIH[AI033142]

NIH[AI52733-06A1]

NIH[AI056070-01A2]

Interhemispheric Research Training Grant in Infectious Diseases, Fogarty International Center (NIH)[D43-TW007129]

Hirschl/Weill-Caulier Career Scientist Award

Training Program in Cellular and Molecular 414 Biology and Genetics[T32 GM007491]

NIH/NCRR[5G12RR008124-16A1]

Graduate School, University of Texas at El-Paso (UTEP)

Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP), Brazil

Biomolecule Analysis Core Facility, Border Biomedical Research Center/Biology/University of Texas at El-Paso (NIH)[5G12RR008124-16A1]

Biomolecule Analysis Core Facility, Border Biomedical Research Center/Biology/University of Texas at El-Paso (NIH)[5G12RR008124-16A1S1]