title: A new subfamily of fungal subtilases: structural and functional analysis of a Pleurotus ostreatus member.
abstract: Pleurotus ostreatus produces several extracellular proteases which are believed to be involved in the regulation of the ligninolytic activities of this fungus. Recently, purification and characterization of the most abundant P. ostreatus extracellular protease (PoSl) have been reported. The sequence of the posl gene and of the corresponding cDNA has been determined, allowing the identification of its pre- and pro-sequences. A mature protein sequence has been verified by mass spectrometry mapping, the N-glycosylation sites have been identified and the glycosidic moieties characterized. Mature PoSl shows a cleaved peptide bond in the C-terminal region, which remains associated with the catalytic domain in a non-covalent complex. Reported results indicate that this enzyme is involved in the activation of other P. ostreatus secreted proteases, thus suggesting its leading role in cascade activation mechanisms. Analyses of the PoSl sequence by homology search resulted in the identification of a DNA sequence encoding a new protease, homologous to PoSl, in the Phanerochaete chrysosporium genome. A new subgroup of subtilisin-like proteases, belonging to the pyrolysin family, has been defined, which includes proteases from ascomycete and basidiomycete fungi.
authors.affiliation: Dipartimento di Chimica Organica e Biochimica, Università di Napoli 'Federico II', Complesso Universitario Monte S. Angelo, via Cinthia, 80126 Napoli, Italy.
authors.forename: Vincenza
authors.initials: V
authors.lastname: Faraco
authors.affiliation: ISPAAM, Consiglio Nazionale delle Ricerche, via Argine 1085, 80147 Napoli, Italy.
authors.forename: Gianna
authors.initials: G
authors.lastname: Palmieri
authors.affiliation: Dipartimento di Chimica Organica e Biochimica, Università di Napoli 'Federico II', Complesso Universitario Monte S. Angelo, via Cinthia, 80126 Napoli, Italy.
authors.forename: Giovanna
authors.initials: G
authors.lastname: Festa
authors.affiliation: Dipartimento di Chimica Organica e Biochimica, Università di Napoli 'Federico II', Complesso Universitario Monte S. Angelo, via Cinthia, 80126 Napoli, Italy.
authors.forename: Maria
authors.initials: M
authors.lastname: Monti
authors.affiliation: Dipartimento di Chimica Organica e Biochimica, Università di Napoli 'Federico II', Complesso Universitario Monte S. Angelo, via Cinthia, 80126 Napoli, Italy.
authors.forename: Giovanni
authors.initials: G
authors.lastname: Sannia
authors.affiliation: Dipartimento di Chimica Organica e Biochimica, Università di Napoli 'Federico II', Complesso Universitario Monte S. Angelo, via Cinthia, 80126 Napoli, Italy.
authors.forename: Paola
authors.initials: P
authors.lastname: Giardina
mesh_terms: D000595:Amino Acid Sequence; D003001:Cloning, Molecular; D018076:DNA, Complementary; D005656:Fungal Proteins / Q000235:genetics / Q000378:metabolism; D015971:Gene Expression Regulation, Enzymologic; D015966:Gene Expression Regulation, Fungal; D008969:Molecular Sequence Data; D010447:Peptide Hydrolases / Q000235:genetics / Q000378:metabolism*; D020076:Pleurotus / Q000201:enzymology* / Q000235:genetics; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization; D013329:Structure-Activity Relationship; D013379:Substrate Specificity; D013381:Subtilisins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism
chemical_list: D018076:DNA, Complementary; D005656:Fungal Proteins; D010447:Peptide Hydrolases; D013381:Subtilisins