Purification and characterization of a chitosanase from Serratia marcescens TKU011 |
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Authors: | Wang San-Lang Peng Jo-Hua Liang Tzu-Wen Liu Kao-Cheng |
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Affiliation: | aGraduate Institute of Life Sciences, Tamkang University, 151 Ying-Chaun Road, Tamsui 251, Taiwan |
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Abstract: | A chitosanase was purified from the culture supernatant of Serratia marcescens TKU011 with shrimp shell wastes as the sole carbon/nitrogen source. Zymogram analysis revealed the presence of chitosanolytic activity corresponding to one protein, which was purified by a combination of ion-exchange and gel-filtration chromatography. The molecular weight of the chitosanase was 21 kDa and 18 kDa estimated by SDS–PAGE and gel-filtration, respectively. The optimum pH, optimum temperature, pH stability, and thermal stability of the chitosanase were 5, 50 °C, pH 4–8, and <50 °C, respectively. The chitosanase was inhibited completely by EDTA, Mn2+, and Fe2+. The results of peptide mass mapping showed that three tryptic peptides of the chitosanase were identical to a chitin-binding protein Cbp21 from S. marcescens (GenBank accession number gi58177632) with 63% sequence coverage. |
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Keywords: | Serratia marcescens Chitosanase Chitosan Chitin Shrimp shell wastes |
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