title: Isoenzyme patterns: a valuable molecular tool for the differentiation of Zygosaccharomyces species and detection of misidentified isolates.
abstract: Electrophoretic analysis of esterase, acid phosphatase, lactate dehydrogenase, glucose-6-phosphate dehydrogenase and alcohol dehydrogenase isoenzymes was performed in 39 strains classified into six species of the yeast genus Zygosaccharomyces. The electrophoretic profiles obtained allowed the clear separation of Z. bailii, Z. bisporus, Z. florentinus, Z. lentus, Z. mellis and Z. rouxii, strains of the latter species clustering into two subgroups. Furthermore, this methodology enabled the detection of misidentified strains, as subsequently confirmed by DNA-DNA reassociation and sequencing of the D1/D2 domain of the 26S rRNA gene. Cluster analysis of the global electrophoretic data and those obtained using only two of the isoenzyme systems, esterase and lactate dehydrogenase, yielded similar grouping of the strains examined, indicating that these enzymes are good markers for the differentiation of Zygosaccharomyces species.
authors.affiliation: Estação Vitivinícola Nacional, Instituto Nacional de Investigação Agrária e das Pescas, Dois Portos, Portugal.
authors.forename: Filomena L
authors.initials: FL
authors.lastname: Duarte
authors.forename: Célia
authors.initials: C
authors.lastname: Pais
authors.forename: Isabel
authors.initials: I
authors.lastname: Spencer-Martins
authors.forename: Cecília
authors.initials: C
authors.lastname: Leão
mesh_terms: D004271:DNA, Fungal / Q000032:analysis; D004275:DNA, Ribosomal / Q000032:analysis; D004586:Electrophoresis / Q000379:methods; D007527:Isoenzymes / Q000032:analysis*; D016533:Mycological Typing Techniques; D009693:Nucleic Acid Hybridization; D012335:RNA, Ribosomal / Q000235:genetics; D020068:Zygosaccharomyces / Q000145:classification* / Q000201:enzymology / Q000235:genetics*
chemical_list: D004271:DNA, Fungal; D004275:DNA, Ribosomal; D007527:Isoenzymes; D012335:RNA, Ribosomal; C065096:RNA, ribosomal, 26S