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High yield soluble bacterial expression and streamlined purification of recombinant human interferon α-2a.

Abstract：

:Interferon α-2a (IFNA2) is a member of the Type I interferon cytokine family, known for its antiviral and anti-proliferative functions. The role of this family in the innate immune response makes it an attractive candidate for the treatment of many viral and chronic immune-compromised diseases. Recombinant IFNA2 is clinically used to modulate hairy cell leukemia as well as hepatitis c. Historically, IFNA2 has been purified from human leukocytes as well as bacterial expression systems. In most cases, bacterial expression of IFNA2 resulted in inclusion body formation, or required numerous purification steps that decreased the protein yield. Here, we describe an expression and purification scheme for IFNA2 using a pET-SUMO bacterial expression system and a single purification step. Using the SUMO protein as the fusion tag achieved high soluble protein expression. The SUMO tag was cleaved with the Ulp1 protease leaving no additional amino acids on the fusion terminus following cleavage. Mass spectrometry, circular dichroism, 2D heteronuclear NMR, and analytical ultracentrifugation confirmed the amino acid sequence identity, secondary and tertiary protein structures, and the solution behavior of the purified IFNA2. The purified protein also had antiviral and anti-proliferative activities comparable to the WHO International Standard, NIBSC 95/650, and the IFNA2 standard available from PBL Assay Science. Combining the expression and purification protocols developed here to produce IFNA2 on a laboratory scale with the commercial fermenter technology commonly used in pharmaceutical industry may further enhance IFNA2 yields, which will promote the development of interferon-based protein drugs to treat various disorders.

journal_name

Protein Expr Purif

journal_title

Protein expression and purification

authors

Bis RL,Stauffer TM,Singh SM,Lavoie TB,Mallela KM

doi

10.1016/j.pep.2014.04.010

subject

Has Abstract

pub_date

2014-07-01 00:00:00

pages

138-46

eissn

1046-5928

issn

1096-0279

pii

S1046-5928(14)00088-6

journal_volume

99

pub_type

杂志文章

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