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Many mycoplasma genes contain internal UGA (opal) codons because of their use as tryptophan coding codons. This results in a lack of expression of many cloned mycoplasma antigenic epitopes in Escherichia coli. It has been shown that opal suppressors can be used to enhance expression of defined mycoplasma gene sequences, but no studies have been published using E. coli suppressor strains to screen mycoplasma gene libraries for immunoreactive epitopes. The E. coli suppressor strain ISM612 was used to screen a Mycoplasma hyopneumoniae Lambda gene library. This strain contained an inducible opal suppressor, trpT, as well as the release factor 2 mutation prfB3. Strain ISM612 was shown to enhance antibody recognition of cloned mycoplasmal gene sequences.

Use of an enhanced Escherichia coli opal suppressor strain to screen a Mycoplasma hyopneumoniae library