Zhang J J, Paulus H
Department of Metabolic Regulation, Boston Biomedical Research Institute, Massachusetts 02114.
J Bacteriol. 1990 Aug;172(8):4690-3. doi: 10.1128/jb.172.8.4690-4693.1990.
Strains of Bacillus subtilis deficient in aspartokinases II and III are unable to grow in the absence of lysine, methionine, and threonine, although they have normal levels of aspartokinase I (J.J. Zhang, F.M. Hu, N.Y. Chen, and H. Paulus, J. Bacteriol. 172:701-708, 1990). Revertants with the ability to grow in the absence of lysine and methionine had an altered aspartokinase I, which was insensitive to feedback inhibition by meso-diaminopimelate. This suggests that inhibition by meso-diaminopimelate limits the ability of aspartokinase I to function in amino acid biosynthesis.
枯草芽孢杆菌中缺乏天冬氨酸激酶II和III的菌株,即便天冬氨酸激酶I水平正常,在没有赖氨酸、蛋氨酸和苏氨酸的情况下也无法生长(J.J. Zhang、F.M. Hu、N.Y. Chen和H. Paulus,《细菌学杂志》172:701 - 708,1990年)。具有在没有赖氨酸和蛋氨酸的情况下生长能力的回复突变体,其天冬氨酸激酶I发生了改变,对中-二氨基庚二酸的反馈抑制不敏感。这表明中-二氨基庚二酸的抑制作用限制了天冬氨酸激酶I在氨基酸生物合成中发挥作用的能力。