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During translation of the Bacillus subtilis cdd gene, encoding cytidine deaminase (CDA), a ribosomal -1 frameshift occurs near the stop codon, resulting in a CDA subunit extended by 13 amino acids. The frequency of the frameshift is approximately 16%, and it occurs both when the cdd gene is expressed from a multicopy plasmid in Escherichia coli and when it is expressed from the chromosomal copy in B. subtilis. As a result, heterotetrameric forms of the enzyme are formed in vivo along with the dominant homotetrameric species. The different forms have approximately the same specific activity. The cdd gene was cloned in pUC19 such that the lacZ' gene of the vector followed the cdd gene in the -1 reading frame immediately after the cdd stop codon. By using site-directed mutagenesis of the cdd-lacZ' fusion, it was shown that frameshifting occurred at the sequence CGA AAG, 9 bp upstream of the in-frame cdd stop codon, and that it was stimulated by a Shine-Dalgarno-like sequence located 14 bp upstream of the shift site. The possible function of this frameshift in gene expression is discussed.

Ribosomal −1 Frameshifting during Decoding ofBacillus subtilis cddOccurs at the Sequence CGA AAG