Abstract
In Escherichia coli, the level of 6-phosphogluconate dehydrogenase is directly proportional to the cellular growth rate during growth in minimal media. This contrasts with the report by Winkler et al. (M. E. Winkler, J. R. Roth, and P. E. Hartman, J. Bacteriol. 133:830-843, 1978) that the level of the enzyme in Salmonella typhimurium LT-2 strain SB3436 is invariant. The basis for the difference in the growth-rate-dependent regulation between the two genera was investigated. Expression of gnd, which encodes 6-phosphogluconate dehydrogenase, was growth rate uninducible in strain SB3436, as reported previously, but it was 1.4-fold growth rate inducible in other S. typhimurium LT-2 strains, e.g., SA535. Both the SB3436 and SA535 gnd genes were growth rate inducible in E. coli K-12. Moreover, the nucleotide sequences of the regulatory regions of the two S. typhimurium genes were identical. We concluded that a mutation unlinked to gnd is responsible for the altered growth rate inducibility of 6-phosphogluconate dehydrogenase in strain SB3436. Transductional analysis showed that the altered regulation is due to the presence of a mutation in hisT, the gene for the tRNA modification enzyme pseudouridine synthetase I. A complementation test showed that the regulatory defect conferred by the hisT mutation was recessive. In E. coli, hisT mutations reduced the extent of growth rate induction by the same factor as in S. typhimurium. The altered regulation conferred by hisT mutations was not simply due to their general effect of reducing the polypeptide chain elongation rate, because miaA mutants, which lack another tRNA modification and have a similarity reduced chain growth rate, had higher rather than lower 6-phosphogluconate dehydrogenase levels. Studies with genetic fusions suggested that hisT mutations lower the gnd mRNA level. The data also indicated that hisT is involved in translational control of gnd expression, but not the aspect mediated by the internal complementary sequence.
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Selected References
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