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Production, purification and characterization of a 50-kDa extracellular metalloprotease from Serratia marcescens

机译:粘质沙雷氏菌50 kDa细胞外金属蛋白酶的生产,纯化和鉴定

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摘要

The extracellular metalloprotease (SMP 6.1) produced by a soil isolate of Serratia marcescens NRRL B-23112 was purified and characterized. SMP 6.1 was purified from the culture supernatant by ammonium sulfate precipitation, acetone fractional precipitation, and preparative isoelectric focusing. SMP 6.1 has a molecular mass of approximately 50,900 Da by sodium dodecyl sulfate/polyacrylamide gel electrophoresis (SDS-PAGE). The following substrates were hydrolyzed: casein, bovine serum albumin, and hide powder. SMP 6.1 has the characteristics of a metalloprotease, a pH optimum of 10.0, and a temperature optimum of 42 degrees C. The isoelectric point of the protease is 6.1. Restoration of proteolytic activity by in-gel renaturation after SDS-PAGE indicates a single polypeptide chain. SMP 6.1 is inhibited by EDTA (9 micrograms/ml) and not inhibited by antipain dihydrochloride (120 micrograms/ml), aprotinin (4 micrograms/ml), bestatin (80 micrograms/ml), chymostatin (50 micrograms/ml), E-64 (20 micrograms/ml), leupeptin (4 micrograms/ml), Pefabloc SC (2000 micrograms/ml), pepstatin (4 micrograms/ml), phosphoramidon (660 micrograms/ml), or phenylmethylsulfonyl fluoride (400 micrograms/ml). SMP 6.1 retains full activity in the presence of SDS (1% w/v), Tween-20 (1% w/v), Triton X-100 (1% w/v), ethanol (5% v/v), and 2-mercaptoethanol (0.5% v/v). The extracellular metalloprotease SMP 6.1 differs from the serratiopeptidase (Sigma) produced by S. marcescens ATCC 27117 in the following characteristics: isoelectric point, peptide mapping and nematolytic properties.
机译:纯化并鉴定了粘质沙雷氏菌NRRL B-23112的土壤分离物产生的细胞外金属蛋白酶(SMP 6.1)。通过硫酸铵沉淀,丙酮分级沉淀和制备性等电聚焦从培养上清液中纯化SMP 6.1。通过十二烷基硫酸钠/聚丙烯酰胺凝胶电泳(SDS-PAGE),SMP 6.1的分子量约为50,900 Da。水解以下底物:酪蛋白,牛血清白蛋白和生皮粉。 SMP 6.1具有金属蛋白酶的特性,最适pH为10.0,最适温度为42摄氏度。该蛋白酶的等电点为6.1。在SDS-PAGE后通过凝胶内复性恢复蛋白水解活性表明单条多肽链。 SMP 6.1受到EDTA(9微克/毫升)的抑制,而不受抗痛药二盐酸盐(120微克/毫升),抑肽酶(4微克/毫升),Bestatin(80微克/毫升),chymostatin(50微克/毫升),E的抑制-64(20微克/毫升),亮肽素(4微克/毫升),Pefabloc SC(2000微克/毫升),胃抑素(4微克/毫升),磷酰胺(660微克/毫升)或苯甲基磺酰氟(400微克/毫升) )。 SMP 6.1在SDS(1%w / v),Tween-20(1%w / v),Triton X-100(1%w / v),乙醇(5%v / v),和2-巯基乙醇(0.5%v / v)。细胞外金属蛋白酶SMP 6.1与marcescens ATCC 27117产生的serratiopeptidase(Sigma)的区别在于以下特征:等电点,肽图分析和溶酶特性。

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