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      저자 : ( Rengasamy Ramasamy ) (검색결과 1 건)
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        Production and Characterization of a Novel Protease from Bacillus sp. RRM1 Under Solid State Fermentation

        ( Renganathan Rajkumar ),( Jayappriyan Kothilmozhian Ranishree ),( Rengasamy Ramasamy ) 한국미생물 · 생명공학회 2011 Journal of microbiology and biotechnology Vol.21 No.6

        A commercially important alkaline protease, produced by Bacillus sp. RRM1 isolated from the red seaweed Kappaphycus alvarezii (Doty) Doty ex Silva, was first recognized and characterized in the present study. Identification of the isolated bacterium was done using both biochemical characterization as well as 16S rRNA gene sequencing. The bacterial strain, Bacillus sp. RRM1, produced a high level of protease using easily available, inexpensive agricultural residues solid-state fermentation (SSF). Among them, wheat bran was found to be the best substrate. Influences of process parameters such as moistening agents, moisture level, temperature, inoculum concentration, and co-carbon and co-nitrogen sources on the fermentation were also evaluated. Under optimized conditions, maximum protease production (i.e., 2081 U/g) was obtained from wheat bran, which is about 2-fold greater than the initial conditions. The protease enzyme was stable over a temperature range of 30-60oC and pH 6-12, with maximum activity at 50oC and pH 9.0. Whereas the metal ions Na+, Ca2+, and K+ enhanced the activity of the enzyme, others such as Hg2+, Cu2+, Fe2+, Co2+, and Zn2+ had rendered negative effects. The activity of the enzyme was inhibited by EDTA and enhanced by Cu2+ ions, thus indicating the nature of the enzyme as a metalloprotease. The enzyme showed extreme stability and activity even in the presence of detergents, surfactants, and organic solvents. Moreover, the present findings opened new vistas in the utilization of wheat bran, a cheap, abundantly available, and effective waste as a substrate for SSF.

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