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• W1585320423 abstract "Aims: To determine the ability of a novel Bacillus subtilis AMR isolated from poultry waste to hydrolyse human hair producing peptidases including keratinases and hair keratin peptides. Methods and Results: The Bacillus subtilis AMR was identified using biochemical tests and by analysis of 16S rDNA sequence. The isolate was grown in medium containing human hair as the sole source of carbon and nitrogen. The supplementation of hair medium (HM) with 0·01% yeast extract increased the keratinolytic activity 4·2-fold. B. subtilis AMR presented high keratinase production on the 8th day of fermentation in hair medium (HM) supplemented with 0·01% yeast extract (HMY) at pH 8·0. Keratinase yield was not correlated with increase in biomass. Zymography showed keratin-degrading peptidases migrating at c. 54, 80 and 100 kDa and gelatin-degrading bands at c. 80, 70 63, 54 32 and 15 kDa. Keratinases were optimally active at 50°C and pH 9·0 and was fully inhibited by the serine proteinase inhibitor (PMSF). Scanning electron microscopy showed complete degradation of the hair cuticle after exposure to B. subtilis AMR grown in HMY. MALDI-TOF analysis of culture supernatant containing peptides produced during enzymatic hydrolysis of hair by B. subtilis AMR revealed fragments in a range of 800–2600 Da. Conclusions: This study showed that B. subtilis AMR was able to hydrolyse human hair producing serine peptidases with keratinase and gelatinase activity as well as hair keratin peptides. Significance and Impact of the Study: This is the first report describing the production and partial characterization of keratinases by a B. subtilis strain grown in a medium containing human hair. These data suggest that peptides obtained from enzymatic hair hydrolysis may be useful for future applications on pharmaceutical and cosmetic formulations." @default.
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• W1585320423 date "2010-01-01" @default.
• W1585320423 modified "2023-10-03" @default.
• W1585320423 title "Keratinolytic activity of Bacillus subtilis AMR using human hair" @default.
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• W1585320423 doi "https://doi.org/10.1111/j.1472-765x.2009.02760.x" @default.
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