Construction of a new polycistronic vector for over-expression and rapid purification of human hemoglobin

被引:5
|
作者
Domingues, Elisa
Brillet, Thomas
Vasseur, Corinne
Agier, Virginie
Marden, Michael C.
Baudin-Creuza, Veronique [1 ]
机构
[1] Univ Paris 07, INSERM, U779, F-94275 Le Kremlin Bicetre, France
关键词
Co-expression pGEx vector; GST PreScission protease; Polycistronic system; Protein engineering; Rapid affinity purification; Recombinant Hb A; ALPHA-GLOBIN CHAINS; SEQUENCE-SPECIFIC PROTEOLYSIS; ESCHERICHIA-COLI; BETA-GLOBIN; PROTEIN; BACTERIA; CHAPERONE; BINDING; ADULT; STATE;
D O I
10.1016/j.plasmid.2008.09.006
中图分类号
Q3 [遗传学];
学科分类号
071007 ; 090102 ;
摘要
To facilitate the study of the structure-function relationship of human hemoglobin (Hb A), we have developed a new hemoglobin expression vector, pGEX6P-alpha-[SD]-beta. This vector allows the co-expression of alpha-Hb as a fusion protein with Glutathione S-Transferase (GST-alpha-Hb) and beta-Hb with an additional methionine at the N-terminal extremity (r beta-Hb). These proteins were solubilized as GST-alpha-Hb/r beta-Hb complex form and purified in one step by affinity chromatography on immobilized glutathione. The CO binding kinetic studies show that the GST-alpha-Hb/r beta-Hb complex and recombinant Hb A exhibit the same allosteric behavior as for native Hb A. The GST moiety, which does not modify the function of the complex, can be easily eliminated by cleavage by the PreScission Protease. After cleavage during the rapid purification procedure, over 20 mg of recombinant Hb per liter of culture were obtained, more than double the yield of previous co-expression systems. This polycistronic vector system, which offers the additional advantage of a very rapid purification, is especially well suited for the study of abnormal, unstable globins in order to better understand the associated pathology. (c) 2008 Elsevier Inc. All rights reserved.
引用
收藏
页码:71 / 77
页数:7
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