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Active, Soluble Recombinant Melittin Purified by Extracting Insoluble Lysate of Escherichia coli Without Denaturation

机译:通过提取未变性的大肠杆菌不溶性裂解物纯化的活性,可溶性重组蜂毒素

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摘要

Cell lytic peptides are a class of drugs that can be used to selectively kill invading organisms or diseased cells. Several of these peptides have been identified as potential therapeutics. Herein, we report a novel process for purifying recombinant melittin, a cell lytic peptide that inserts into the membranes of cells causing cell lysis, from Escherichia coli. The process involves surfactant and low pH to solubilize melittin fusion proteins from the insoluble fraction of bacterial lysates. We are able to significantly improve purity of the final product and confirm the activity of the peptide. The process yields recombinant melittin that is effective when used to treat U-87 MG glioma cells and inhibits growth of the gram-positive pathogenic bacterium Streptococcus pyogenes. We demonstrate a method of repeated extraction of the insoluble protein fraction with mild detergent at a low pH that is able to generate a yield of pure, soluble melittin of ~0.5-1 mg/L of E. coli culture.
机译:细胞溶解肽是一类药物,可用于选择性杀死入侵的生物或患病细胞。这些肽中的几种已被鉴定为潜在的治疗剂。本文中,我们报道了一种从大肠杆菌中纯化重组蜂毒肽的新方法,蜂毒肽是一种插入细胞膜的细胞溶解肽,可引起细胞溶解。该过程涉及表面活性剂和低pH,以从细菌溶解产物的不溶级分中溶解蜂毒素融合蛋白。我们能够显着提高最终产品的纯度并确认肽的活性。该方法产生重组蜂毒肽,当用于治疗U-87 MG神经胶质瘤细胞时有效,并抑制革兰氏阳性致病菌化脓性链球菌的生长。我们展示了一种在低pH值下用温和的去污剂重复提取不溶蛋白部分的方法,该方法能够产生约0.5-1 mg / L的大肠杆菌培养物纯净的可溶性蜂毒素。

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