title: Isolation of an acetyl-CoA synthetase gene (ZbACS2) from Zygosaccharomyces bailii.
abstract: A gene homologous to Saccharomyces cerevisiae ACS genes, coding for acetyl-CoA synthetase, has been cloned from the yeast Zygosaccharomyces bailii ISA 1307, by using reverse genetic approaches. A probe obtained by PCR amplification from Z. bailii DNA, using primers derived from two conserved regions of yeast ACS proteins, RIGAIHSVVF (ScAcs1p; 210-219) and RVDDVVNVSG (ScAcs1p; 574-583), was used for screening a Z. bailii genomic library. Nine clones with partially overlapping inserts were isolated. The sequenced DNA fragment contains a complete ORF of 2027 bp (ZbACS2) and the deduced polypeptide shares significant homologies with the products of ACS2 genes from S. cerevisiae and Kluyveromyces lactis (81% and 82% identity and 84% and 89% similarity, respectively). Phylogenetic analysis shows that the sequence of Zbacs2 is more closely related to the sequences from Acs2 than to those from Acs1 proteins. Moreover, this analysis revealed that the gene duplication producing Acs1 and Acs2 proteins has occurred in the common ancestor of S. cerevisiae, K. lactis, Candida albicans, C. glabrata and Debaryomyces hansenii lineages. Additionally, the cloned gene allowed growth of S. cerevisiae Scacs2 null mutant, in medium containing glucose as the only carbon and energy source, indicating that it encodes a functional acetyl-CoA synthetase. Also, S. cerevisiae cells expressing ZbACS2 have a shorter lag time, in medium containing glucose (2%, w/v) plus acetic acid (0.1-0.35%, v/v). No differences in cell response to acetic acid stress were detected both by specific growth and death rates. The mode of regulation of ZbACS2 appears to be different from ScACS2 and KlACS2, being subject to repression by a glucose pulse in acetic acid-grown cells.
authors.affiliation: Instituto de Ciências da Vida e Saúde, Universidade do Minho, Campus de Gualtar, 4710-057 Braga, Portugal.
authors.forename: Fernando
authors.initials: F
authors.lastname: Rodrigues
authors.forename: Anne-Marie
authors.initials: AM
authors.lastname: Zeeman
authors.forename: Helena
authors.initials: H
authors.lastname: Cardoso
authors.forename: Maria João
authors.initials: MJ
authors.lastname: Sousa
authors.forename: H Yde
authors.initials: HY
authors.lastname: Steensma
authors.forename: Manuela
authors.initials: M
authors.lastname: Côrte-Real
authors.forename: Cecília
authors.initials: C
authors.lastname: Leão
mesh_terms: D000106:Acetate-CoA Ligase / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism; D000595:Amino Acid Sequence; D001483:Base Sequence; D003001:Cloning, Molecular; D017124:Conserved Sequence; D017931:DNA Primers; D004271:DNA, Fungal / Q000235:genetics / Q000302:isolation & purification; D005800:Genes, Fungal; D007700:Kinetics; D008969:Molecular Sequence Data; D010802:Phylogeny; D016133:Polymerase Chain Reaction; D011994:Recombinant Proteins / Q000378:metabolism; D012441:Saccharomyces cerevisiae / Q000201:enzymology / Q000235:genetics; D016415:Sequence Alignment; D017386:Sequence Homology, Amino Acid; D020068:Zygosaccharomyces / Q000201:enzymology / Q000235:genetics*
chemical_list: D017931:DNA Primers; D004271:DNA, Fungal; D011994:Recombinant Proteins; D000106:Acetate-CoA Ligase