Reyes O, Gottesman M, Adhya S
J Bacteriol. 1976 Jun;126(3):1108-12. doi: 10.1128/jb.126.3.1108-1112.1976.
Bacterial mutations (psuA and psu) known for their ability to suppress the polarity on nonsense mutations are shown to suppress the polarity of certain insertion mutations in the gal operon. The short insertion, IS1 (800 nucleotide pairs), is about 15 to 50% suppressed, whereas longer insertions, IS2 (1,400 nucleotide pairs), and IS3 (1,200 nucleotide pairs), are not. Some of the polarity suppressor mutations (psu-1, psu-2, and psu-3) are at least partially permissive for N-gene mutations (N7 and N53) of bacteriophage lambda, suggesting a relationship between natural and mutational polar signals. That this relationship may be complex is indicated by the fact that other suppressor mutations, effective in suppressing nonsense or insertion polarity, fail entirely to permit the growth of lambda N mutants.
已知具有抑制无义突变极性能力的细菌突变(psuA和psu)被证明可抑制gal操纵子中某些插入突变的极性。短插入序列IS1(800个核苷酸对)约有15%至50%被抑制,而较长的插入序列IS2(1400个核苷酸对)和IS3(1200个核苷酸对)则未被抑制。一些极性抑制突变(psu - 1、psu - 2和psu - 3)对噬菌体λ的N基因突变(N7和N53)至少部分允许,这表明天然极性信号与突变极性信号之间存在关联。其他抑制突变虽能有效抑制无义或插入极性,但完全不能使λ N突变体生长,这一事实表明这种关系可能很复杂。