Gots J S, Benson C E, Shumas S R
J Bacteriol. 1972 Nov;112(2):910-6. doi: 10.1128/jb.112.2.910-916.1972.
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.
鼠伤寒沙门氏菌的某些proAB缺失突变体被发现同时缺失了利用鸟嘌呤和黄嘌呤所需的一个基因(命名为gxu)。这些突变体对8-氮杂鸟嘌呤具有抗性,并且当携带额外的嘌呤突变时,无法将鸟嘌呤或黄嘌呤用作嘌呤来源。该缺陷与鸟嘌呤和黄嘌呤的摄取及磷酸核糖基转移酶活性的缺陷相关。次黄嘌呤和腺嘌呤的活性未改变。通过转导至pro(+)以及在F'部分二倍体中,该缺陷恢复正常。