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- W1599808531 abstract "Three alkaline protease-producing strains designated as ANFLR1, NPLR1, and PROLR15 were isolated from Labeo rohita fish gut. These strains are able to produce alkaline protease using tannery fleshing (TF) as the sole carbon and nitrogen source and were identified as Bacillus megaterium, Serratia marcescens, and novel Pontibacter sps. Proteases from these organisms were purified to electrophoretic homogeneity following ammonium sulphate precipitation, ion exchange, and column chromatography. SDS-PAGE revealed molecular weights of the proteases to be 46 kDa (ANFLR1), 52 kDa (NPLR1), and 58 kDa (PROLR15). The optimum pH and temperature for the protease activity of ANFLR1, NPLR1, and PROLR15 were found to be 10.5, 11.5, 9, and 70°C, 60°C, and 50°C, respectively. The maximum protease activities at the optimum conditions were 420 U/mL (ANFLR1), 550 U/mL (NPLR1), and 530 U/mL (PROLR15). Inhibition of the NPLR1 protease by pepstatin confirmed aspartate-type enzymatic activity. Fe3+ enhanced the activity of PROLR15 protease. Unlike all other microbial proteases known so far, the PROLR15 enzyme did not require Ca2+ for activity and thermal stability. SDS-PAGE and scanning electron microscopy analyses confirmed the conversion of high molecular weight substrate (TF) to low molecular weight peptides by these proteases. The alkaline metalloprotease production by novel Pontibacter sps. and aspartate protease production by S. marcescens remain unexplored. Hence, TF with its relatively abundant availability can be beneficially utilized for alkaline protease production through the fish gut microbial fermentation processes." @default.
- W1599808531 created "2016-06-24" @default.
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- W1599808531 date "2012-04-01" @default.
- W1599808531 modified "2023-09-24" @default.
- W1599808531 title "Production of different proteases from fish gut microflora utilizing tannery fleshing" @default.
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- W1599808531 doi "https://doi.org/10.1002/elsc.201100097" @default.
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