Abstract
Lysozyme was purified from purple washington clam Saxidomus purpurata by sequential procedures using Chitopearl Basic BL-01 affinity and TSKgel ODS-120T column chromatographies. Molecular mass of the purified enzyme was estimated to be 12 kDa by SDS-PAGE. Optimum pH of the enzyme was 5.2 toward Micrococcus lysodeikticus cells. The optimum temperature was 50°C. The enzyme was stable in the range of pH 4.8–6.8 and 20–90°C. Further, the N-terminal amino acid sequence of the enzyme showed similarity to lysozymes from invertebrates. However, the specific activity of the enzyme toward M. lysodeikticus cells and p-nitrophenyl penta-N-acetyl-β-chitopentaoside was 143 times and 12 times higher than that of hen egg white lysozyme, respectively.
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