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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
We determined the nucleotide (nt) sequence of a mutation that confers proline overproduction and enhanced tolerance of osmotic stress on bacteria. The mutation, designated as proB74, is an allele of the Escherichia coliproB gene which results in a loss of allosteric regulation of the protein product, gamma-glutamyl kinase. Our sequencing indicated that the proB74 mutation is a substitution of an A for a G at nt position 319 of the coding strand of the gene, resulting in a change of an aspartate to an asparagine at amino acid (aa) residue 107 of the predicted protein product. Rushlow et al. [Gene 39 (1984) 109-112] determined that another proB mutation (designated as DHPR), that resulted in a loss of allosteric inhibition by proline of the E. coli gamma-glutamyl kinase, was due to a substitution of an alanine for a glutamate at aa residue 143. Therefore, even though both the DHPR and the proB74 mutations caused a loss of allosteric inhibition of gamma-glutamyl kinase, they are due to different amino acid substitutions.[1]
