Foster J W
J Bacteriol. 1983 Oct;156(1):424-8. doi: 10.1128/jb.156.1.424-428.1983.
By use of Mu cts d1(Ap lac) phage, a strain of Salmonella typhimurium was isolated containing a Mu d insertion in a locus (sinA) which is induced during nicotinate, thiamine, purine, amino acid, phosphate, and carbon starvation conditions. Depending on the starvation condition, a 2- to 10-fold increase in beta-galactosidase activity was demonstrated. The sinA locus, which mapped at 32 U, became induced after a decline in growth rate due to starvation. The introduction of relA into the sinA-lac strain prevented induction by nicotinate starvation and partially prevented induction by phosphate starvation. The data suggest that sinA responds to changes in growth rate due to various nutrient starvation conditions and probably responds in part to changes in guanosine tetraphosphate levels.
利用Mu cts d1(Ap lac)噬菌体,分离出一株鼠伤寒沙门氏菌,该菌株在一个基因座(sinA)中有一个Mu d插入,该基因座在烟酸、硫胺素、嘌呤、氨基酸、磷酸盐和碳饥饿条件下被诱导。根据饥饿条件,β-半乳糖苷酶活性提高了2至10倍。位于32 U处的sinA基因座在因饥饿导致生长速率下降后被诱导。将relA导入sinA-lac菌株可防止烟酸饥饿诱导,并部分防止磷酸盐饥饿诱导。数据表明,sinA对各种营养饥饿条件下生长速率的变化作出反应,并且可能部分地对四磷酸鸟苷水平的变化作出反应。