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Translational coupling was demonstrated in a gene fusion in which the promoter and the N-terminal region of the Bacillus subtilis subtilisin (aprA) gene were fused to a promoterless Tn9-derived chloramphenicol acetyltransferase (CAT; EC 2.3.1.28) gene. Expression of this gene fusion results in the production of a native-sized CAT product, whereas the Tn9-derived CAT gene is usually not translated from its own ribosome binding site in B. subtilis (D. S. Goldfarb, R. L. Rodriguez, and R. H. Doi, Proc. Natl. Acad. Sci. USA 79:5886-5890, 1982). A 178-base-pair deletion, which removed part of the signal peptide and the propeptide of the aprA gene and created a translational stop codon 230 base pairs upstream of the CAT gene ribosome binding site, reduced expression of the CAT gene. A BamHI 10-mer linker insertion into this deletion site, which restored the reading frame and simultaneously removed the translation stop codon, restored CAT gene expression. The data indicate that expression of the CAT gene was dependent on translation of the truncated aprA gene into the ribosome binding site of the CAT gene.
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