Wang JC, Zhao F, Li RG, Wang B. Purification and properties of the protease from
Perinereis aibuhitensis Grube.
Shijie Huaren Xiaohua Zazhi 2007;
15:800-806. [DOI:
10.11569/wcjd.v15.i8.800]
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Abstract
AIM: To purify a new protease from the clamworm Perinereis aibuhitensis Grube, and study its properties.
METHODS: After homogenization, Superdex-75 chromatography, MonoQTM chromatography, and SP-Sepharose 4B chromatography were used ordinally to purify the protease from the clamworm Perinereis aibuhitensis Grube. A new gelatin zymography method was used to study the proteolytic activity of the protease: protease separated by non-reductive SDS-PAGE was electrophoretically transferred to a gel containing gelatin, and the proteolytic activity of the protease was determined by the clear zone of the electrophoretic protein band. The effect of pH value, temperature, protease inhibitor, organic solvents and metal ions on the proteolytic activity of the protease was studied.
RESULTS: After purification, one kind of protease was obtained, which showed two protein bands with molecular weights of 34900 and 33900 separately by reductive SDS-PAGE, while three bands with molecular weights of 65600, 57900, and 43500 separately by non-reductive SDS-PAGE. Gelatin zymography showed that the proteolytic activity mainly appeared around the band of Mr 66000. The protease was stable and displayed high proteolytic activity within the range of pH 8 to 10 and at 20-35 ℃ It was strongly inhibited by phenylmethyl sulfonyl fluoride (PMSF), while stable in the presence of organic solvents.
CONCLUSION: The protease is composed of two subunits, whose molecular weights are 33900 and 34900, respectively. Gelatin zymography is sensitive and effective in studying the proteolytic activity of proteases.
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