Production and characterization of a bacteriocin produced by Enterococcus faecium LR/6

Manoj Kumar, N. Ghosh, S. Srivastava
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引用次数: 7

Abstract

A soil isolate of Lactic acid bacteria (LAB), strain LR/6 was identified as Enterococcus faecium on the basis of its morphological, biochemical, and 16S rDNA analysis. Strain LR/6 is a potential producer of an antimicrobial compound that followed the kinetic pattern typical of a primary metabolite synthesis and is released extracellularly. The antimicrobial action remained unaffected when treated with β-glycerophosphate and catalase suggesting that the activity is neither based on acid nor H2O2 production. This antimicrobial compound was highly stable over a wide range of pH (2.0 to 8.0), high temperature (boiling and autoclaving) and could be stored stably at a range of temperature (-20oC to 37oC) at least upto one year. The proteinaceous nature of the antimicrobial compound was ascertained by its sensitivity to many proteolytic enzymes confirming it to be a bacteriocin. Strain LR/6 bacteriocin was also insensitive to the presence of α-amylase, lipase, surfactants, organic solvents, and showed a bactericidal mode of action. Crude bacteriocin exhibited broad inhibition spectrum both against related as well as some foodborne pathogenic bacteria including Listeria monocytogenes. Tricine SDS-PAGE analysis and bacteriocin activity assay corresponded to a protein of an apparent molecular mass of ~6.0 kDa.
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粪肠球菌LR/6产细菌素的制备及特性研究
根据形态、生化和16S rDNA分析,将一株乳酸菌(LAB)分离株LR/6鉴定为粪肠球菌(Enterococcus faecium)。菌株LR/6是一种抗菌化合物的潜在生产者,它遵循初级代谢物合成的典型动力学模式,并在细胞外释放。当用β-甘油磷酸和过氧化氢酶处理时,抗菌作用仍然不受影响,这表明活性既不是基于酸也不是基于H2O2的产生。该抗菌化合物在较宽的pH范围(2.0 ~ 8.0)、高温(煮沸和高压灭菌)下具有很高的稳定性,可在-20 ~ 37℃的温度范围内稳定保存至少一年。该抗菌化合物的蛋白质性质是通过其对许多蛋白水解酶的敏感性来确定的,证实了它是一种细菌素。菌株LR/6细菌素对α-淀粉酶、脂肪酶、表面活性剂、有机溶剂的存在不敏感,并表现出杀菌作用模式。粗细菌素对相关致病菌及部分食源性致病菌(包括单核增生李斯特菌)均有广泛的抑制作用。三氨酸SDS-PAGE分析和细菌素活性测定表明该蛋白的表观分子质量约为6.0 kDa。
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