title: High level expression and purification of peptide methionine sulfoxide reductase in Escherichia coli.
abstract: The enzyme peptide methionine sulfoxide reductase catalyzes the conversion of methionine sulfoxide residues in proteins to methionine. The 636 nucleotide coding region of the peptide methionine sulfoxide reductase gene has been amplified from a genomic clone using the polymerase chain reaction and the product was subcloned into plasmid pGEX-2T downstream of the glutathione S-transferase gene under control of the tac promoter. Escherichia coli XL1-Blue cells transformed with this plasmid and induced with isopropylthio-beta-galactoside expressed high levels of the fusion protein. The protein was soluble and was purified to homogeneity by affinity binding to a glutathione-agarose resin followed by cleavage of the fusion protein with thrombin. Both the fusion protein and the purified peptide methionine sulfoxide reductase protein showed high peptide methionine sulfoxide reductase activity.
authors: Roche Institute of Molecular Biology, Roche Research Center, Nutley, NJ 07110.
authors: M A
authors: MA
authors: Rahman
authors: N
authors: N
authors: Brot
authors: H
authors: H
authors: Weissbach
mesh_terms: D000595:Amino Acid Sequence; D001483:Base Sequence; D003001:Cloning, Molecular; D004269:DNA, Bacterial / Q000235:genetics; D004926:Escherichia coli / Q000201:enzymology* / Q000235:genetics*; D015870:Gene Expression; D005798:Genes, Bacterial; D051150:Methionine Sulfoxide Reductases; D008969:Molecular Sequence Data; D010088:Oxidoreductases / Q000235:genetics* / Q000302:isolation & purification; D010957:Plasmids; D016133:Polymerase Chain Reaction; D011993:Recombinant Fusion Proteins / Q000235:genetics / Q000302:isolation & purification
chemical_list: D004269:DNA, Bacterial; D011993:Recombinant Fusion Proteins; D010088:Oxidoreductases; D051150:Methionine Sulfoxide Reductases; C027219:methionine sulfoxide reductase