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Two different estimates were obtained for the extent of nucleotide sequence divergence in the structural genes of the tryptophan synthetase alpha-chains of Escherichia coli, Salmonella typhimurium, and Aerobacter aerogenes. One estimate was based on comparisons of the amino acid sequences of the respective alpha chains. The other was derived from measurements of the thermal stability of RNA-DNA hybrids formed with phage DNA carrying the alpha-chain structural gene of E. coli and labeled messenger RNA from the three bacterial species. Comparison of the two estimates suggests that during the course of evolution synonymous codon changes have accumulated in the alpha-chain-structural genes.

proceedings of the national academy of sciences of the united states of america

Nucleotide Sequence Divergence in the α-Chain-Structural Genes of Tryptophan Synthetase from <i>Escherichia coli, Salmonella typhimurium</i> , and <i>Aerobacter aerogenes</i>

Nucleotide Sequence Divergence in the α-Chain-Structural Genes of Tryptophan Synthetase from Escherichia coli, Salmonella typhimurium , and Aerobacter aerogenes