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Renaturation and one step purification of the chicken GIIA secreted phospholipase A2 from inclusion bodies

Authors
Journal
International Journal of Biological Macromolecules
0141-8130
Publisher
Elsevier
Volume
67
Identifiers
DOI: 10.1016/j.ijbiomac.2014.03.009
Keywords
  • Phospholipase A2
  • Gene Expression
  • In Vitro Refolding
Disciplines
  • Biology

Abstract

Abstract The cDNA coding for a mature protein of 123 amino acids, containing all of the structural features of catalytically active group IIA sPLA2, has been amplified from chicken intestine. The gene has been cloned into the bacterial expression vector pET-21a(+), which allows protein over-expression as inclusion bodies and enables about 3mg/l of pure refolded fully active enzyme to be obtained. Recombinant expression of chicken intestinal sPLA2-IIA (ChPLA2-IIA) in Escherichia coli shows that the enzyme is Ca2+ dependent, maximally active at pH 8–9, and hydrolyses phosphatidylglycerol versus phosphatidylcholine with a 10-fold preference. Indeed, we report in this work, a comparative kinetic study between the wild type and the recombinant ChPLA2-IIA, on zwitterionic head group phospholipids (DDPC) and negatively charged phospholipids (POPG) using the monomolecular film technique. The ability to express reasonably large amounts of the sPLA2 Group IIA, compared to that obtained with the classical purification will provide a basis for future site directed mutagenesis studies of this important enzyme.

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