论文名称：Soluble expression, purification, and characterization of Gloydius shedaoensis venom gloshedobin in Escherichia coli by using fusion partners
论文类型：期刊论文
发表刊物：APPLIED MICROBIOLOGY AND BIOTECHNOLOGY
收录刊物：SCIE、EI、PubMed、Scopus
卷号：85
期号：3
页面范围：635-642
ISSN号：0175-7598
关键字：Fibrigenolytic enzyme; GST; NusA; TrxA; Snake venom; Thrombin-like enzyme
摘要：Gloshedobin, a thrombin-like enzyme from the venom of Gloydius shedaoensis, is usually produced as inclusion bodies in Escherichia coli cell. In this work, gloshedobin was separately fused with three fusion partners NusA, GST, and TrxA at its N terminus and then was expressed as fusion proteins in E. coli. The results showed that the NusA was the most efficient fusion partner to improve the solubility of recombinant gloshedobin. The purified NusA-fused gloshedobin with an overall yield of 64.6% was resolved as one band in the SDS-PAGE gel with molecular mass of about 90 kDa. Both fibrinogen clotting and fibrinogenolytic activities were found for the recombinant product. The purified NusA-fused gloshedobin exhibited amidolytic activity of 506 U/mg under optimal conditions of pH of 8.0 and 40A degrees C. The inhibition study of NusA-fused gloshedobin by various inhibitors showed that serine protease inhibitors, phenylmethylsulphonyl fluoride, and N-tosyl-l-phenylalanine chloromethyl ketone, strongly inhibited its admidolytic activity, whereas ethylenediaminetetraacetic acid as well as heparin and hirudin did not, suggesting that NusA-fused gloshedobin exhibited the same characteristics as the native form of gloshedobin. The strategy of this work may contribute to improve the soluble expression level of other thrombin-like enzymes from snake venom in E. coli.
发表时间：2010-01-01