http://www.cnr.it/ontology/cnr/individuo/prodotto/ID17590

Structural and functional characterization of the porcine proline-rich antifungal peptide SP-B isolated from salivary gland granules (Articolo in rivista)

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Structural and functional characterization of the porcine proline-rich antifungal peptide SP-B isolated from salivary gland granules (Articolo in rivista) (literal)

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Cabras T 1; Longhi R 2; Secundo F 2; Nocca G 3; Conti S 4; Polonelli I 4; Fanali C 3; Inzitari R 3; Petruzzelli R 5; Messana I 1; Castagnola M 3; Vitali A 2 (2008)
Structural and functional characterization of the porcine proline-rich antifungal peptide SP-B isolated from salivary gland granules
in Journal of peptide science (Print)
(literal)

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Cabras T 1; Longhi R 2; Secundo F 2; Nocca G 3; Conti S 4; Polonelli I 4; Fanali C 3; Inzitari R 3; Petruzzelli R 5; Messana I 1; Castagnola M 3; Vitali A 2 (literal)

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1 Università Cagliari 2 ICRM-CNR 3 Università Cattolica, Roma 4 Università Parma 5 Università di Chieti (literal)

Titolo

Structural and functional characterization of the porcine proline-rich antifungal peptide SP-B isolated from salivary gland granules (literal)

Abstract

A 1905-Da cationic proline-rich peptide, named SP-B, was recently isolated by our group as the main component of salivary gland granules, and its primary sequence fully characterized by means of automated Edman sequencing and LC-MS/MS tools. In the present study SP-B is shown to possess antifungal activity when challenged with strains of Cryptococcus neoformans, Candida albicans and Aspergillus fumigatus, while only negligible antibacterial activity was detected. Furthermore, SP-B was found to be non-cytotoxic when tested on fibroblast cell lines. To obtain information regarding its structure affinity, capillary electrophoresis (CE), circular dichroism (CD) and attenuated total reflection (ATR)-FT/IR experiments were performed. CE revealed a pH dependence of the hydrodynamic radial dimensions both in aqueous and 2,2,2-trifluoroethanol solutions. CD and ATR-FT/IR measurements confirmed the structure-pH relationship, revealing a secondary structure composed of mixed proportions of polyproline-II, unordered and turn motifs, the last being more evident in the zwitterionic form of the peptide. From these findings SP-B peptide could be classified as a new member of the proline-rich antimicrobial peptide family. (literal)

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