PROTEOLYTIC ACTIVITY OF LACTOBACILLUS SAKEI, LACTOBACILLUS FARCIMINIS AND LACTOBACILLUS PLANTARUM ON SARCOPLASMIC PROTEINS OF PORK LEAN |
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Authors: | ANNA LISA BASSO GIANLUCA PICARIELLO RAFFAELE COPPOLA PATRIZIO TREMONTE SALVATORE SPAGNA MUSSO ALDO DI LUCCIA |
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Affiliation: | Istituto per il Sistema Produzione Animale in Ambiente Mediterraneo (ISPAAM) CNR Via Argine 1085 80147 Napoli, Italy;Istituto di Scienze dell'Alimentazione (ISA)-CNR Via Roma 52 A/C 83100 Avellino, Italy;Dipartimento di Scienze e Tecnologie Agro-Alimentari Ambientali e Microbiologiche Universita degli Studi del Molise Via De Sanctis 86100 Campobasso, Italy;Dipartimento di Scienza degli Alimenti Universita degli Studi di Napoli Federico II Parco Gussone 80055 Portici (Napoli), Italy;Dipartimento di Produzione Animale Universita degli Studi di Bari Via Amendola 165/A 70126 Bari, Italy |
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Abstract: | The aim of this study was to assess the proteolytic activity of Lactobacillus sakei (DSM 6333), L. plantarum (B21), and to a lesser extent, L. farciminis (DSM 20184) on meat sarcoplasmic proteins. The protein composition was assayed by sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) and capillary electrophoresis after incubation of meat extract inoculated with bacteria. All strains showed proteolytic activity: a band about 94 kDa disappeared in samples inoculated with L. farciminis and L. plantarum and strongly decreased in those inoculated with L. sakei. The intensity of the bands with a molecular weight between 94 and 38 kDa decreased in all samples. Capillary electrophoresis analysis ascertained the disappearance of the fractions corresponding to 8.64 and 8.66 min retention time in all samples. The bands corresponding to 94 kDa and 38 kDa were, respectively, identified as glycogen phosphorylase muscle isoform and glyceraldehyde 3-phosphate dehydrogenase, by in situ digestion of protein gel bands and peptide map analysis using Matrix Assisted Laser Desorption/Ionization - Time of Flight Mass Spectrometry (MALDI-TOF MS). |
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