Author(s): VasseurGodbillon C, Hamdane D, Marden MC, BaudinCreuza V
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Abstract The alpha-subunits of human hemoglobin (Hb) have been more difficult to express than beta-chains owing to the high instability of alpha-chains. Here, we describe the production in Escherichia coli of a soluble recombinant alpha-Hb with human alpha-hemoglobin-stabilizing protein (AHSP), its molecular chaperone. To succeed in this expression, we have constructed a vector pGEX-alpha-AHSP which contains two cassettes arranged in tandem in the same orientation permitting to express alpha-hemoglobin and human AHSP. While the GST-alpha-Hb alone was expressed in E.coli as insoluble protein, even after adding lysate containing recombinant AHSP, the expression vector pGEX-alpha-AHSP permits the co-expression of soluble GST-alpha-Hb and GST-AHSP. The alpha-Hb, produced at a high yield of 12 to 20 mg per liter of culture, was then purified as a complex with its chaperone. Biochemical and biophysical properties of recombinant AHSP/recombinant alpha-Hb complex were similar to those of recombinant AHSP/native alpha-Hb complex as assessed by UV/visible and CO or O(2) binding properties. This co-expression technique can be use to study the interaction between a molecular chaperone and its target protein and, more generally, this system would be particularly interesting for the study of partner proteins when one or both proteins are individually unstable.
This article was published in Protein Eng Des Sel
and referenced in Journal of Molecular Biomarkers & Diagnosis