Abstract
Bacterial genes that code for proteins appear to possess a codon usage characteristic of their overall base composition. This results in different but predictable non-random distributions of nucleotides within codons, permitting the recognition of protein-coding sequences in a wide range of bacterial species. The nature of this distribution depends on the base composition of the coding sequence. The position-specific differences are especially conspicuous in genes of extreme G + C content, allowing the particularly reliable prediction of the reading frame and coding strand of experimentally determined DNA sequences. This fmding has been exploited to identify the coding sequence of the viomycin phosphotransferase ( vph) gene of Streptomyces vinaceus. An easily applied computer program (“Frame”) has been written to carry out and display such analyses.
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