title: Toluene gas phase biofiltration by Paecilomyces lilacinus and isolation and identification of a hydrophobin protein produced thereof.
abstract: Paecilomyces lilacinus consumed toluene as the sole carbon source in a gas-phase biofilter packed with perlite obtaining an average elimination capacity of 50 g m(-3) h(-1), a removal efficiency of 53%, and a final biomass of 31.6 mg biomass g dry support(-1). Hydrophobin proteins from the mycelium produced in the biofilter were purified by formic acid extraction and precipitated by electrobubbling, and the molecular weight was found to be 10.6 +/- 0.3 kDa. The peptide mass fingerprinting analysis of the purified hydrophobin by matrix-assisted laser desorption/ionization time-of-flight resulted in the identification of two peptides that presented high homology with sequences of class I hydrophobin proteins from other ascomycetous fungi when compared against the National Center for Biotechnology Information database. The yield of hydrophobin (PLHYD) from P. lilacinus was 1.1 mg PLHYD g biomass(-1). These proteins modified the hydrophobicity of Teflon by lowering the contact angle from 130.1 (+/-2) degrees to 57.0 (+/-5) degrees supporting hot sodium dodecyl sulfate washing. This work is the first report about biodegradation of toluene by the nematophagous fungus P. lilacinus in a gas-phase biofilter and the identification of its hydrophobin protein.
authors.affiliation: Departamento de Biotecnología, Universidad Autónoma Metropolitana-Iztapalapa, Av. San Rafael Atlixco no. 186, México, DF, México.
authors.forename: Gabriel
authors.initials: G
authors.lastname: Vigueras
authors.forename: Keiko
authors.initials: K
authors.lastname: Shirai
authors.forename: Daniel
authors.initials: D
authors.lastname: Martins de Souza
authors.forename: Daniel
authors.initials: D
authors.lastname: Martins
authors.forename: Telma Teixeira
authors.initials: TT
authors.lastname: Franco
authors.forename: Luciana Francisco
authors.initials: LF
authors.lastname: Fleuri
authors.forename: Sergio
authors.initials: S
authors.lastname: Revah
mesh_terms: D018533:Biomass; D002849:Chromatography, Gas; D005374:Filtration; D005656:Fungal Proteins / Q000737:chemistry* / Q000302:isolation & purification* / Q000378:metabolism; D008970:Molecular Weight; D025282:Mycelium / Q000737:chemistry / Q000378:metabolism; D010143:Paecilomyces / Q000737:chemistry / Q000378:metabolism*; D044367:Phase Transition; D014050:Toluene / Q000737:chemistry / Q000378:metabolism*
chemical_list: D005656:Fungal Proteins; D014050:Toluene