Abstract
Six Trichosporon asahii strains designated ICVY021, ICVY022, ICVY023, ICVY024, ICVY025 and ICVY026 were isolated from camel milk and studied for their inhibitory activities against a large number of fungi and bacteria as target organisms. Only strain ICVY021 was able to inhibit Kocuria rhizophila CIP 53.45, through production of an extracellular heat-stable, proteinaceous antibacterial peptide, with partial amino acid sequences of PPFPK and CTHV(L/I)(K/Q) or TCHV(L/I)(K/Q), determined using LC/MS/MS. This peptide, named oranicin P16, was thought to impede the cell-division mechanism. The anti- K. rhizophila activity was confirmed, in situ, using skim milk as a food matrix. T. asahii ICVY021 did not show any hemolytic activity or any cytotoxicity effect against eukaryotic Caco-2 cells. T. asahii ICVY021 was sensitive to azoles antifungal compounds, but not to 5-fluorocytosine and anidulafungin.
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