The protease from Chromohalobacter japonicus BK-AB18 was produced by growing bacteria in a LB medium containing 5% casein and NaCl. crude partially purified three levels of ammonium sulfate concentration (ranges 0–70%, 70–75% 75–80%) the highest specific activity exhibited range 75–80%. enzyme has relative molecular weight 65 kDa. this fraction had following optimum conditions: 7.5% NaCl, pH 9....