Legrain C, Stalon V, Glansdorff N
J Bacteriol. 1976 Oct;128(1):35-8. doi: 10.1128/jb.128.1.35-38.1976.
Among the Enterobacteriaceae, Escherichia coli K-12 is the only strain known to have two structural genes (argF and argI) for ornithine carbamoyltransferase. The two gene products interact to form a family of four functional isoenzymes, respectively designated FFF, FFI, FII, and III. The FFF and III isoenzymes exhibit nearly identical kinetic parameters in the conditions applied. FFF is more thermolabile than III; this allows the straightforward characterization of new transducing phages carrying either argF or argI. The bearing of the available information regarding ornithine carbamoyltransferase isoenzymes on the evolution of the ancestral E. coli chromosome is reconsidered.
在肠杆菌科细菌中,大肠杆菌K-12是已知唯一具有鸟氨酸氨甲酰基转移酶两个结构基因(argF和argI)的菌株。这两种基因产物相互作用形成一个由四种功能性同工酶组成的家族,分别命名为FFF、FFI、FII和III。在应用的条件下,FFF和III同工酶表现出几乎相同的动力学参数。FFF比III更不耐热;这使得携带argF或argI的新型转导噬菌体能够直接被鉴定。本文重新审视了关于鸟氨酸氨甲酰基转移酶同工酶的现有信息对祖先大肠杆菌染色体进化的影响。