title: Iron-responsive genes of Phanerochaete chrysosporium isolated by differential display reverse transcription polymerase chain reaction.
abstract: White-rot fungus Phanerochaete chrysosporium, a ligninolytic basidiomycete, was studied to identify iron-responsive genes. Using the differential display reverse transcription PCR technique (DDRT-PCR), a total of 97 differentially expressed cDNA fragments were identified by comparing band intensities among fingerprints obtained from mycelia cultivated in iron-deficient and iron-replete media. Transcripts induced under iron-starvation exhibited homologies to: a modular polyketide synthase, a TonB protein, a probable transmembrane protein, a putative ABC transporter permease and a HSP70-related heat-shock protein. Modular polyketide synthase and TonB proteins are normally expressed under iron-starvation and are known to be involved in biosynthesis and transport of siderophores respectively. Also, a deduced protein with 96% similarity to a precursor of the well-known P. chrysosporium lignin peroxidase was identified under iron-deficiency. Two DDRT-PCR products confirmed their iron-induced expression. One was homologue to the CNOT3, which is a global regulator of RNA polymerase II transcription and has been implicated in multiple roles in the control of mRNA metabolism. The other was similar to the Schizosaccharomyces pombe putative proteasome maturation factor upm1. In conclusion, the majority of iron-responsive P. chrysosporium transcripts isolated in the DDRT-PCR encode proteins involved in iron acquisition, especially members of biosynthesis and transport of iron chelators.
authors.affiliation: Centro de Biologia Molecular e Engenharia Genética, Universidade Estadual de Campinas, Caixa Postal 6010, 13083-970 Campinas, SP, Brazil.
authors.forename: Eliana Maria
authors.initials: EM
authors.lastname: Assmann
authors.forename: Laura Maria Mariscal
authors.initials: LM
authors.lastname: Ottoboni
authors.forename: André
authors.initials: A
authors.lastname: Ferraz
authors.forename: Jaime
authors.initials: J
authors.lastname: Rodríguez
authors.forename: Maricilda Palandi
authors.initials: MP
authors.lastname: De Mello
mesh_terms: D015152:Blotting, Northern; D004587:Electrophoresis, Agar Gel; D004591:Electrophoresis, Polyacrylamide Gel; D005656:Fungal Proteins / Q000737:chemistry / Q000235:genetics*; D020869:Gene Expression Profiling; D015966:Gene Expression Regulation, Fungal; D005800:Genes, Fungal; D018840:HSP70 Heat-Shock Proteins / Q000235:genetics; D007501:Iron / Q000378:metabolism*; D035925:Iron-Regulatory Proteins / Q000737:chemistry / Q000235:genetics*; D008565:Membrane Proteins / Q000235:genetics; D026901:Membrane Transport Proteins / Q000235:genetics; D008969:Molecular Sequence Data; D009097:Multienzyme Complexes / Q000235:genetics; D010544:Peroxidases / Q000235:genetics; D020075:Phanerochaete / Q000235:genetics* / Q000254:growth & development / Q000378:metabolism; D012331:RNA, Fungal / Q000302:isolation & purification; D020133:Reverse Transcriptase Polymerase Chain Reaction; D017422:Sequence Analysis, DNA; D012689:Sequence Homology, Nucleic Acid; D017262:Siderophores / Q000235:genetics; D014158:Transcription, Genetic
chemical_list: D005656:Fungal Proteins; D018840:HSP70 Heat-Shock Proteins; D035925:Iron-Regulatory Proteins; D008565:Membrane Proteins; D026901:Membrane Transport Proteins; D009097:Multienzyme Complexes; D012331:RNA, Fungal; D017262:Siderophores; D007501:Iron; D010544:Peroxidases; C042858:lignin peroxidase