Some Properties of a Chitinase from a Marine Luminous Bacterium, Vibrio fischeri Strain COT-A136

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A chitinolytic, luminous bacterium was isolated from the intestine of a fish, Oplegnathus tunctatus, and identified as Vibrio fischeri. A chitinase from the culture supernatant of the intestinal luminous strain, V. fischeri COT-A136,was purified. The purified chitinase had a molecular weight of 63000,comprising a dimer of 31500 molecular weight subunits. The enzyme was most active at pH6.0 and 45℃, and stable below 40℃. The chitinase had high activities at 2% through 5% NaCl concentration, but the activity was suppressed at low and high NaCl concentrations.
1992-06-25