Cloning, sequencing and expression of the fab fragment of a monoclonal antibody to the herbicide atrazine

Vernon K. Ward, Peter G. Sehneider, Sabine B. Kreissig, Bruce D. Hammock, Prabhakara V Choudary

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38 Scopus citations


The Fab region of an IgG2b antibody (AM7B2.1) reactive to the herbicide atrazine was cloned into a plasmid vector using the polymerase chain reaction and two sets of degenerate oligonucleotide primers designed to mimic the amino acid variation at the N-termini of χL-chains and TH-chains. These primers also provide a secretion signal fused precisely to the antibody gene sequence for secretion of the mature antibody. A further set of universal oligonucleotide primers was developed for the direct sequencing of the VH and Cm regions of γB-chains and the VL and CL regions of χL-chains without subcloning and were used to determine the sequence of this antibody. The χL-chain was found to not possess a conserved Cys residue at position 23 and the implications of this observation are discussed. The cloned genes were expressed in Escherichia coli using a commercially available T7 RNA polymerase-based plasmid. The clones were also expressed in a 17 RNA polymerasebased system containing an attenuated version of the T7 RNA polymerase promoter, plus a lac promoter placed in an antisense orientation, to enhance plasmid stability. The expressed products were confirmed as atrazine reactive by binding to an atrazine derivative conjugated with alkaline phosphatase.

Original languageEnglish (US)
Pages (from-to)981-988
Number of pages8
JournalProtein Engineering, Design and Selection
Issue number8
StatePublished - Nov 1993


  • Antibody cloning
  • Antibody expression
  • Atrazine
  • Pesticide analysis
  • Recombinant antiboby

ASJC Scopus subject areas

  • Pharmacology
  • Neuroscience(all)
  • Immunology and Microbiology(all)
  • Molecular Biology
  • Bioengineering
  • Biotechnology
  • Biochemistry


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