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From Pichia anomala killer toxin through killer antibodies to killer peptides for a comprehensive anti-infective strategy

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Abstract

“Antibiobodies”, antibodies (Abs) with antibiotic activity, internal image of a Pichia anomala killer toxin (PaKT) characterized by microbicidal activity against microorganisms expressing β-glucans cell-wall receptors (PaKTRs), were produced by idiotypic vaccination with a PaKT-neutralizing monoclonal Ab (PaKT-like Abs) or induced by a protein-conjugated β-glucan. Human natural PaKT-like Abs (PaKTAbs) were found in the vaginal fluid of women infected with KT-sensitive microorganisms. Monoclonal and recombinant PaKT-like Abs, and PaKTAbs proved to be protective against experimental candidiasis, cryptococcosis and aspergillosis. A killer decapeptide (KP), synthesized from the sequence of a recombinant PaKT-like Ab or produced in transgenic plants, showed a microbicidal activity in vitro, neutralized by β-glucans, a therapeutic effect in vivo, against experimental mucosal and systemic mycoses, and a prophylactic role in planta, against phytopathogenic microorganisms, respectively. KP showed fungicidal properties against all the defective mutants of a Saccharomyces cerevisiae library, inclusive of strains recognized to be resistant to conventional antifungal drugs. KP inhibited in vitro, ex vivo and/or in vivo HIV-1 and Influenza A virus replication, owing to down-regulation of CCR5 co-receptors, physical block of the gp120-receptor interaction and reduction in the synthesis of glycoproteins, HA and M1 in particular. KP modulated the expression of costimulatory and MHC molecules on murine dendritic cells, improving their capacity to induce lymphocyte proliferation. KP, proven to be devoid of cytotoxicity on human cells, showed self-assembly-releasing hydrogel-like properties, catalyzed by β 1,3 glucan. PaKT’s biotechnological derivatives may represent the prototypes of novel antifungal vaccines and anti-infective drugs characterized by different mechanisms of action.

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Authors and Affiliations

  1. Dipartimento di Patologia e Medicina di Laboratorio, Sezione di Microbiologia, Università degli Studi di Parma, Viale A. Gramsci 14, 43126, Parma, Italy

    Luciano Polonelli, Walter Magliani, Tecla Ciociola, Laura Giovati & Stefania Conti

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  1. Luciano Polonelli
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  2. Walter Magliani
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  3. Tecla Ciociola
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  4. Laura Giovati
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  5. Stefania Conti
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Correspondence to Luciano Polonelli.

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Polonelli, L., Magliani, W., Ciociola, T. et al. From Pichia anomala killer toxin through killer antibodies to killer peptides for a comprehensive anti-infective strategy. Antonie van Leeuwenhoek 99, 35–41 (2011). https://doi.org/10.1007/s10482-010-9496-3

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  • DOI: https://doi.org/10.1007/s10482-010-9496-3

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