Expression of the synthetic gene of an artificial DDT-binding polypeptide in Escherichia coli
Open Access
- 1 January 1987
- journal article
- research article
- Published by Oxford University Press (OUP) in Protein Engineering, Design and Selection
- Vol. 1 (4), 339-343
- https://doi.org/10.1093/protein/1.4.339
Abstract
This paper reports the expression of an artificial functional polypeptide in bacteria. The gene of a designed 24-residue DDT-binding polypeptide (DBP) was inserted between the BamHI and PstI cleavage sites of plasmid pUR291. The hybrid plasmid, pUR291-DBP, was cloned in Escherichia coli JM109. After induction by isopropyl-β-D-thiogalactopyranoside a fusion protein was expressed in which DBP was linked to the COOH-termiuus of β-galactosidase. DBP, which is stable to trypsin, was obtained by tryptic digestion of the fusion protein and subsequent fractionation of the tryptic peptides by reversed-phase h.p.l.c. Recombinant and chemically synthesized DBP showed identical chromatographic properties, amino acid composition, and chymotryptic digestion patterns. Both the β-galactosidase-DBP fusion and isolated recombinant DBP bound DDT. The fusion protein was 25 times as potent as the designed 24-residue DBP in activating a cytochrome P-450 model system using equimolar catalytic amounts of the two proteins.This publication has 9 references indexed in Scilit:
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