title: High-affinity copper transport and Snq2 export permease of saccharomyces cerevisiae modulate cytotoxicity of PR-10 from Theobroma cacao.
abstract: A pathogenesis-related (PR) protein from Theobroma cacao (TcPR-10) was identified from a cacao-Moniliophthora perniciosa interaction cDNA library. Nucleotide and amino acid sequences showed homology with other PR-10 proteins having P loop motif and Betv1 domain. Recombinant TcPR-10 showed in vitro and in vivo ribonuclease activity, and antifungal activity against the basidiomycete cacao pathogen M. perniciosa and the yeast Saccharomyces cerevisiae. Fluorescein isothiocyanate-labeled TcPR-10 was internalized by M. perniciosa hyphae and S. cerevisiae cells and inhibited growth of both fungi. Energy and temperature-dependent internalization of the TcPR-10 suggested an active importation into the fungal cells. Chronical exposure to TcPR-10 of 29 yeast mutants with single gene defects in DNA repair, general membrane transport, metal transport, and antioxidant defenses was tested. Two yeast mutants were hyperresistant compared with their respective isogenic wild type: ctr3Delta mutant, lacking the high-affinity plasma membrane copper transporter and mac1Delta, the copper-sensing transcription factor involved in regulation of high-affinity copper transport. Acute exposure of exponentially growing yeast cells revealed that TcPR-10 resistance is also enhanced in the Snq2 export permease-lacking mutant which has reduced intracellular presence of TcPR-10.
authors.affiliation: UESC, Centro de Biotecnologia e Genética, Laboratório de Biologia de Fungos, Rodovia Ilhéus-Itabuna, Ilhéus-BA-Brasil.
authors.forename: Cristina
authors.initials: C
authors.lastname: Pungartnik
authors.forename: Aline Clara
authors.initials: AC
authors.lastname: da Silva
authors.forename: Sarah Alves
authors.initials: SA
authors.lastname: de Melo
authors.forename: Karina Peres
authors.initials: KP
authors.lastname: Gramacho
authors.forename: Júlio Cézar
authors.initials: JC
authors.lastname: de Mattos Cascardo
authors.forename: Martin
authors.initials: M
authors.lastname: Brendel
authors.forename: Fabienne
authors.initials: F
authors.lastname: Micheli
authors.forename: Abelmon
authors.initials: A
authors.lastname: da Silva Gesteira
mesh_terms: D018528:ATP-Binding Cassette Transporters / Q000235:genetics / Q000378:metabolism*; D000363:Agaricales / Q000187:drug effects / Q000502:physiology; D000595:Amino Acid Sequence; D002099:Cacao / Q000235:genetics / Q000378:metabolism* / Q000382:microbiology; D003300:Copper / Q000378:metabolism*; D004591:Electrophoresis, Polyacrylamide Gel; D054884:Host-Pathogen Interactions; D008856:Microscopy, Fluorescence; D008969:Molecular Sequence Data; D010940:Plant Proteins / Q000235:genetics / Q000378:metabolism* / Q000494:pharmacology; D012441:Saccharomyces cerevisiae / Q000187:drug effects / Q000254:growth & development / Q000378:metabolism; D029701:Saccharomyces cerevisiae Proteins / Q000235:genetics / Q000378:metabolism*; D017386:Sequence Homology, Amino Acid
chemical_list: D018528:ATP-Binding Cassette Transporters; D010940:Plant Proteins; C101797:SNQ2 protein, S cerevisiae; D029701:Saccharomyces cerevisiae Proteins; D003300:Copper