title: Soluble expression and one-step purification of a neurotoxin Huwentoxin-I in Escherichia coli.
abstract: Huwentoxin-I (HWTX-I) is a small 33-amino acid neurotoxin from the venom of the Chinese bird spider Ornithoctonus huwena. HWTX-I selectively blocks N-type voltage-sensitive calcium channels (N-VSCCs) and has great potential for clinical application as a novel analgesic without inducing drug tolerance. However, there are still many unsolved issues for this peptide, such as its clinical efficacy in analgesia, anesthesia, and even its potential role in drug rehabilitation. Therefore, large amounts of active recombinant HWTX-I are urgently needed. In this report, we describe a novel and efficient way to produce large amounts of the valuable form in Escherichia coli. HWTX-I was expressed in soluble form as an N-terminal intein fusion product. After affinity purification, a pH shift-induced self-cleavage of the intein released HWTX-I, resulting in a single-column purification of the target protein. The whole-cell patch clamp assay showed that purified HWTX-I has activity similar to another commercialized N-VSCC blocker omega-conotoxin MVIIA. Production of HWTX-I by this method has the major advantages of high efficiency and low cost.
authors.affiliation: The National Laboratory of Protein Engineering and Plant Genetic Engineering, School of Life Sciences, Peking University, Beijing, 100871, PR China.
authors.forename: Nanying
authors.initials: N
authors.lastname: Che
authors.forename: Lili
authors.initials: L
authors.lastname: Wang
authors.forename: Yin
authors.initials: Y
authors.lastname: Gao
authors.forename: Chengcai
authors.initials: C
authors.lastname: An
mesh_terms: D000818:Animals; D020864:Calcium Channels, N-Type / Q000187:drug effects / Q000378:metabolism; D002540:Cerebral Cortex / Q000187:drug effects / Q000378:metabolism; D002681:China; D004361:Drug Tolerance; D004926:Escherichia coli / Q000235:genetics* / Q000378:metabolism; D009474:Neurons / Q000187:drug effects / Q000378:metabolism; D009498:Neurotoxins / Q000096:biosynthesis* / Q000235:genetics / Q000302:isolation & purification* / Q000494:pharmacology; D051381:Rats; D017207:Rats, Sprague-Dawley; D011994:Recombinant Proteins / Q000096:biosynthesis / Q000302:isolation & purification / Q000494:pharmacology; D030162:Reptilian Proteins / Q000096:biosynthesis* / Q000235:genetics / Q000302:isolation & purification* / Q000494:pharmacology; D012995:Solubility; D013111:Spider Venoms / Q000096:biosynthesis* / Q000235:genetics / Q000302:isolation & purification* / Q000494:pharmacology; D013112:Spiders / Q000737:chemistry* / Q000235:genetics
chemical_list: D020864:Calcium Channels, N-Type; D009498:Neurotoxins; D011994:Recombinant Proteins; D030162:Reptilian Proteins; D013111:Spider Venoms; C083624:huwentoxin I