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. 1972 Nov;112(2):910–916. doi: 10.1128/jb.112.2.910-916.1972

Genetic Separation of Hypoxanthine and Guanine-Xanthine Phosphoribosyltransferase Activities by Deletion Mutations in Salmonella typhimurium

Joseph S Gots 1, Charles E Benson 1, Susan R Shumas 1
PMCID: PMC251503  PMID: 4563984

Abstract

Certain proAB deletion mutants of Salmonella typhimurium were found to be simultaneously deleted in a gene required for the utilization of guanine and xanthine (designated gxu). These mutants were resistant to 8-azaguanine and when carrying an additional pur mutation were unable to use guanine or xanthine as a purine source. The defect was correlated with deficiencies in the uptake and phosphoribosyltransferase activities for guanine and xanthine. Hypoxanthine and adenine activities were unaltered. The deficiency was restored to normal by transduction to pro+ and in F′ merodiploids.

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Selected References

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