[논문]Production and Characterization of Keratinolytic Proteases by a Chicken Feather-Degrading Thermophilic Strain, Thermoactinomyces sp. YT06

Wang, Lin; Qian, Yuting; Cao, Yun; Huang, Ying; Chang, Zhizhou; Huang, Hongying

doi:10.4014/jmb.1705.05082

Production and Characterization of Keratinolytic Proteases by a Chicken Feather-Degrading Thermophilic Strain, Thermoactinomyces sp. YT06 원문보기

Journal of microbiology and biotechnology, v.27 no.12, 2017년, pp.2190 - 2198

Wang, Lin (Circular Agriculture Research Center, Jiangsu Academy of Agricultural Sciences) , Qian, Yuting (Circular Agriculture Research Center, Jiangsu Academy of Agricultural Sciences) , Cao, Yun (Circular Agriculture Research Center, Jiangsu Academy of Agricultural Sciences) , Huang, Ying (Nanjing Institute of Agricultural Sciences in Jiangsu Hilly Area) , Chang, Zhizhou (Circular Agriculture Research Center, Jiangsu Academy of Agricultural Sciences) , Huang, Hongying (Circular Agriculture Research Center, Jiangsu Academy of Agricultural Sciences)

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Thermoactinomyces sp. strain YT06 was isolated from poultry compost and observed to degrade integral chicken feathers completely at $60^{\circ}C$, resulting in the formation of 3.24 mg/ml of free amino acids from 50 ml of culture containing 10 g/l chicken feathers. Strain YT06 could grow and secrete keratinase using feather as the only carbon and nitrogen sources without other supplement, but complementation of 10 g/l sucrose and 4 g/l $NaNO_3$ increased the production of the keratinolytic enzyme. The maximum protease activity obtained was 110 U/ml and for keratinase was 42 U/ml. The keratinase maintained active status over a broad pH (pH 8-11) and temperature ($60-75^{\circ}C$). It was inhibited by serine protease inhibitors and most metal ions; however, it could be stimulated by $Mn^{2+}$ and the surfactant Tween-20. A reductive agent (${\beta}$-mercaptoethanol) was observed to cleave the disulfide bond of keratin and improve the access of the enzyme to the keratinaceous substrate. Zymogram analysis showed that strain YT06 primarily secreted keratinase with a molecular mass of approximately 35 kDa. The active band was assessed by MALDI-TOF mass spectrometry and was observed to be completely identical to an alkaline serine protease from Thermoactinomyces sp. Gus2-1. Thermoactinomyces sp. strain YT06 shows great potential as a novel candidate in enzymatic processing of hard-to-degrade proteins into high-value products, such as keratinous wastes.

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The aerobic thermophilic bacterium was very effective in the enzymolysis of whole chicken feathers at 60°C and high pH values, which seemed to be related to the extracellular keratinase activity. The aim of this present study was to investigate the optimization conditions of different physical factors for the secretion of thermostable keratinolytic proteases and characterize the crude enzymes. The findings of this study suggest that Thermoactinomyces sp.

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Production and Characterization of Keratinolytic Proteases by a Chicken Feather-Degrading Thermophilic Strain, Thermoactinomyces sp. YT06 원문보기

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Production and Characterization of Keratinolytic Proteases by a Chicken Feather-Degrading Thermophilic Strain, Thermoactinomyces sp. YT06 원문보기

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