Heterologous expression and characterization of soluble recombinant 3-deoxy-d-arabino-heptulosonate-7-phosphate synthase from Actinosynnema pretiosum ssp. auranticum ATCC31565 through co-expression with Chaperones in Escherichia coli

详细信息	查看全文 | 推荐本文 |

• 作者：Na Ma ; Liujing Wei ; Yuxiang Fan ; Qiang Hua ; ^{qhua@ecust.edu.cn}
• 关键词：DAHPS ; Actinosynnema pretiosum ; Shikimate pathway ; Heterologous co-expression ; Kinetic property
• 刊名：Protein Expression and Purification
• 出版年：2012
• 期刊代码：184_10465928
• 类别：bio
• 出版时间：April, 2012
• 卷：82
• 期：2
• 页码：263-269
• 文件大小：1635 K

摘要

3-Deoxy-d-arabino-heptulosonate-7-phosphate synthase (DAHPS), (EC 2.5.1.54) catalyzes the first step of the shikimate pathway, the route for the biosynthesis of aromatic compounds in plants and microbes. In Actinosynnema pretiosum, the aroF gene (GenBank: ) encodes DAHPS to condensate phosphoenolpyruvate (PEP) and d-erythrose 4-phosphate (E4P) to generate DAHP. In this study, a recombinant pET28a-aroF plasmid was constructed and A. pretiosum DAHPS was successfully expressed in soluble form by co-expression with chaperonins GroEL/GroES in Escherichia coli. The purification and kinetic characterization of the expressed protein were then investigated. The DAHPS originated from A. pretiosum demonstrated a pronounced substrate inhibition by PEP but was not sensitive to E4P. The purified enzyme was completely inactivated by EDTA but potently activated by several bivalent metal ions, especially Mn²⁺ and Co²⁺.