Reiner A M
J Bacteriol. 1969 Mar;97(3):1431-6. doi: 10.1128/jb.97.3.1431-1436.1969.
Three strains of Escherichia coli with altered polynucleotide phosphorylase, Q7, Q13, and Q27, were isolated by screening clones from heavily mutagenized cultures for low levels of the enzyme. The three mutations were found to cotransduce with argG and asp, and the pnp locus which they define was mapped with respect to these loci. An explanation for the nonreciprocal cotransduction frequencies observed with asp is provided by the demonstration of an unlinked asp-suppressing locus.
通过从高度诱变的培养物中筛选低水平该酶的克隆,分离出了三株多核苷酸磷酸化酶发生改变的大肠杆菌菌株,即Q7、Q13和Q27。发现这三个突变与argG和asp共转导,并确定了它们所定义的pnp位点相对于这些位点的图谱。通过证明一个不连锁的asp抑制位点,对观察到的与asp的非相互共转导频率做出了解释。