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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Nucleotide sequence of the genes for tryptophan synthase in Pseudomonas aeruginosa.

We have determined the DNA sequence of the two adjacent genes for the alpha and beta chains of tryptophan synthase in Pseudomonas aeruginosa, along with 34 5'-flanking and 799 3'-flanking base pairs. The gene order is trpBA as predicted from earlier genetic studies, and the two cistrons overlap by 4 bp; a ribosome binding site for the second gene is evident in the coding sequence of the first gene. We have also determined the location of three large deletions eliminating portions of each gene. A detailed comparison of the deduced P. aeruginosa amino acid sequence with those published for E. coli, Bacillus subtilis, and Saccharomyces cerevisiae shows much similarity throughout the beta and most of the alpha subunit. Most of the residues implicated by chemical modification or mutation as being critical for enzymatic activity are conserved, along with many others, suggesting that three-dimensional structure has remained largely constant during evolution. We also report the construction of a recombinant plasmid that overproduces a slightly modified alpha subunit from P. aeruginosa that can form a functionally effective multimer with normal E. coli beta 2 subunit in vivo.[1]


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