Hausmann R
J Virol. 1967 Feb;1(1):57-63. doi: 10.1128/jvi.1.1.57-63.1967.
Synthesis of an S-adenosylmethionine-cleaving enzyme evoked by infection of Escherichia coli with phage T3 was independent of the multiplicity of infection with the wild type, T3 sam(+). It was depressed, however, by mixed infection with related phages genetically incapable of directing enzyme production, such as T3 sam(-), or phage T7. The depressor effect of enzymatically incompetent genomes depended on their proportion among the input phage and not on their absolute multiplicity. The effect was more pronounced with homologous, enzymatically incompetent phage (T3 sam(-)) than with heterologous phage (T7). After ultraviolet irradiation, enzymatically incompetent genomes lost their depressing power; at a survival level of 10(-7), no depression by either homologous or heterologous phage upon T3 sam(+)-directed enzyme synthesis was detected.
噬菌体T3感染大肠杆菌所诱发的S-腺苷甲硫氨酸裂解酶的合成,与野生型T3 sam(+)的感染复数无关。然而,与在遗传上不能指导酶产生的相关噬菌体,如T3 sam(-)或噬菌体T7混合感染时,该酶的合成受到抑制。无酶活性基因组的抑制作用取决于它们在输入噬菌体中的比例,而不取决于它们的绝对感染复数。同源的无酶活性噬菌体(T3 sam(-))比异源噬菌体(T7)的这种抑制作用更明显。紫外线照射后,无酶活性基因组失去其抑制能力;在存活率为10^(-7)时,未检测到同源或异源噬菌体对T3 sam(+)指导的酶合成有抑制作用。