title: The Penicillium chrysogenum extracellular proteome. Conversion from a food-rotting strain to a versatile cell factory for white biotechnology.
abstract: The filamentous fungus Penicillium chrysogenum is well-known by its ability to synthesize β-lactam antibiotics as well as other secondary metabolites. Like other filamentous fungi, this microorganism is an excellent host for secretion of extracellular proteins because of the high capacity of its protein secretion machinery. In this work, we have characterized the extracellular proteome reference map of P. chrysogenum Wisconsin 54-1255 by two-dimensional gel electrophoresis. This method allowed the correct identification of 279 spots by peptide mass fingerprinting and tandem MS. These 279 spots included 328 correctly identified proteins, which corresponded to 131 different proteins and their isoforms. One hundred and two proteins out of 131 were predicted to contain either classical or nonclassical secretion signal peptide sequences, providing evidence of the authentic extracellular location of these proteins. Proteins with higher representation in the extracellular proteome were those involved in plant cell wall degradation (polygalacturonase, pectate lyase, and glucan 1,3-β-glucosidase), utilization of nutrients (extracellular acid phosphatases and 6-hydroxy-d-nicotine oxidase), and stress response (catalase R). This filamentous fungus also secretes enzymes specially relevant for food industry, such as sulfydryl oxidase, dihydroxy-acid dehydratase, or glucoamylase. The identification of several antigens in the extracellular proteome also highlights the importance of this microorganism as one of the main indoor allergens. Comparison of the extracellular proteome among three strains of P. chrysogenum, the wild-type NRRL 1951, the Wis 54-1255 (an improved, moderate penicillin producer), and the AS-P-78 (a penicillin high-producer), provided important insights to consider improved strains of this filamentous fungus as versatile cell-factories of interest, beyond antibiotic production, for other aspects of white biotechnology.
authors.affiliation: Área de Microbiología, Departamento de Biología Molecular, Universidad de León, Campus de Vegazana s/n, 24071 León, Spain.
authors.forename: Mohammad-Saeid
authors.initials: MS
authors.lastname: Jami
authors.forename: Carlos
authors.initials: C
authors.lastname: García-Estrada
authors.forename: Carlos
authors.initials: C
authors.lastname: Barreiro
authors.forename: Abel-Alberto
authors.initials: AA
authors.lastname: Cuadrado
authors.forename: Zahra
authors.initials: Z
authors.lastname: Salehi-Najafabadi
authors.forename: Juan-Francisco
authors.initials: JF
authors.lastname: Martín
mesh_terms: D001426:Bacterial Proteins / Q000378:metabolism*; D001709:Biotechnology; D002473:Cell Wall / Q000378:metabolism; D015180:Electrophoresis, Gel, Two-Dimensional; D009024:Morphogenesis; D010408:Penicillium chrysogenum / Q000378:metabolism*; D020543:Proteome; D053719:Tandem Mass Spectrometry
chemical_list: D001426:Bacterial Proteins; D020543:Proteome
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