Abstract
Expression of mycoplasma sequences in Escherichia coli is often hindered by an unusual mycoplasmal codon usage pattern: the UGA stop codon is utilized for tryptophan. This may result in the truncation of cloned proteins and may prevent the detection of products of many cloned genes. To circumvent this translation barrier, we have developed an expression system for the production of mycoplasma proteins in E. coli. The efficiency of an opal suppressor tRNA ( trpT176) was augmented with other suppressor mutations ( prfB3 or rrsB(SuUGA-ΔC1054) which influence termination events. System efficacy was analyzed by employing suppressor mutations in the expression of TGA-containing sequences from the P1 protein-encoding gene of Mycoplasma pneumoniae.
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