title: The inter-generic fungicidal activity of Xanthophyllomyces dendrorhous.
abstract: In this study, the existence of intra-specific and inter-generic fungicidal activity in Xanthophyllomyces dendrorhous and Phaffia rhodozyma strains isolated from different regions of the earth was examined. Assays were performed under several culture conditions, showing that all the analyzed X. dendrorhous and P. rhodozyma strains have killing activity against Kloeckera apiculata, Rhodotorula sloffiae, and R. minuta. This activity was greater in rich media at a pH from 4.6 to 5.0. Extracellular protein extracts with fungicidal activity were obtained from cultures of all strains, and their characterization suggested that a protein of 33 kDa is the antifungal factor. According to peptide mass fingerprinting and an analysis of the results with the MASCOT search engine, this protein was identified as an aspartic protease. Additionally, extrachromosomal double-stranded DNA elements (dsDNAs) were observed in all X. dendrorhous and P. rhodozyma strains. Although there is a high variability, two dsDNAs of 5.4 and 6.8 kb are present in all strains.
authors.affiliation: Laboratorio de Genética, Departamento de Ciencias Ecológicas, Facultad de Ciencias, Universidad de Chile, Santiago Casilla, 653, Chile. mbaeza@uchile.cl
authors.forename: Marcelo
authors.initials: M
authors.lastname: Baeza
authors.forename: Oriana
authors.initials: O
authors.lastname: Flores
authors.forename: Mario
authors.initials: M
authors.lastname: Carrasco
authors.forename: Juan Manuel
authors.initials: JM
authors.lastname: Rozas
authors.forename: Vicente
authors.initials: V
authors.lastname: Oviedo
authors.forename: Salvador
authors.initials: S
authors.lastname: Barahona
authors.forename: Víctor
authors.initials: V
authors.lastname: Cifuentes
mesh_terms: D000898:Antibiosis; D000935:Antifungal Agents / Q000737:chemistry / Q000302:isolation & purification / Q000378:metabolism; D057055:Aspartic Acid Proteases / Q000737:chemistry / Q000302:isolation & purification / Q000378:metabolism; D001487:Basidiomycota / Q000254:growth & development / Q000378:metabolism / Q000502:physiology*; D003470:Culture Media / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D055322:Kloeckera / Q000254:growth & development*; D013058:Mass Spectrometry; D050296:Microbial Viability; D008970:Molecular Weight
chemical_list: D000935:Antifungal Agents; D003470:Culture Media; D057055:Aspartic Acid Proteases