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Purification and characterization of CHprol, a thermotolerant, alkali-stable and oxidation-resisting protease of Chumathang hotspring
Metagenomic approaches are recently used for searching novel open reading frames (ORFs) coding enzymes employed in pharmaceutical, rood industries, etc. In this study, a metagenornic library was constructed from Chumathang hotspring sediment DNA. The library consisted of approximately 9,000 clones a...
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Published in: | 中国科学通报:英文版 2015 (14), p.1252-1260 |
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Main Author: | |
Format: | Article |
Language: | English |
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Online Access: | Get full text |
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Summary: | Metagenomic approaches are recently used for searching novel open reading frames (ORFs) coding enzymes employed in pharmaceutical, rood industries, etc. In this study, a metagenornic library was constructed from Chumathang hotspring sediment DNA. The library consisted of approximately 9,000 clones and was screened for protease activity. A clone exhibiting protease activity was identified and named CHprol. Sequencing of CHprol revealed that the ORF encoded a functional protein of 363 amino acids belonging to peptidase S8-S53 superfamily. CHprol shared 41% sequence similarity with a reported protease (subtilase family) and 35 % structural similarity with the crystal structure of Pro-Tk sps. of Thermococcus kodarkaenasis. In silico modeling the 3D structure of CHprol showed that it has two beta sheets, 10 alpha helices and 11 strands. Catalytic triad prediction implied CHprol to be a serine protease. The optimum temperature and pH of the purified protease were found to be 80 ℃ and 11.0, respectively. The enzyme was active at 5 % concentration of hydrogen peroxide and retained 60 % of activity at 10 % concentration. The thermotolerant, alkalophilic and oxidant stable properties of the protease make it a potential can- didate for biotechnological applications. |
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ISSN: | 1001-6538 1861-9541 |