Expression, purification, and functional characterization of recombinant human interleukin-7

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• 作者：Yong Luo ; Xiangping Kong ; Aimin Xu ; Shouguang Jin ; Donghai Wu
• 关键词：Pichia pastoris ; Human interleukin-7 ; Recombinant protein ; Purification ; SP Sepharose ; Cell proliferation
• 刊名：Protein Expression and Purification
• 出版年：2009
• 出版时间：January 2009
• 年：2009
• 卷：63
• 期：1
• 页码：1-4
• 全文大小：375 K

文摘

Human interleukin-7 (IL-7) is a member of the interleukin family. Numerous studies have demonstrated IL-7’s effect on B- and T-cell development as well as its potential in various clinical applications. Previously, a study reported that IL-7 could be purified from inclusion bodies using a prokaryotic system, however, the required refolding step limits the recovery rate. This study was designed to produce a bioactive recombinant human IL-7 (rhIL-7) in a eukaryotic expression system in order to obtain higher yields of the protein with simpler purification steps. We cloned human IL-7 cDNA and successfully expressed active recombinant protein in yeast using the Pichia pastoris expression system. A simple purification strategy was established to purify the rhIL-7 from the fermentation supernatant, yielding 35 mg/L at 95 % purity by the use of a common SP Sepharose FF cation-exchange chromatography. Functional analysis of the purified rhIL-7 by the pre-B cell MTT (3-(4,5-dimethylthiazolyl-2)-2,5-diphenyltetrazolium bromide) proliferation assay demonstrated a specific activity comparable to commercial sources. These results suggest that purification of rhIL-7 from yeast provides a sound strategy for large-scale production of the rhIL-7 for clinical applications as well as basic researches.