Udaka S
J Bacteriol. 1966 Feb;91(2):617-21. doi: 10.1128/jb.91.2.617-621.1966.
Udaka, Shigezo (The Institute of Physical and Chemical Research, Komagome, Bunkyo-ku, Tokyo, Japan). Pathway-specific pattern of control of arginine biosynthesis in bacteria. J. Bacteriol. 91:617-621. 1966.-To compare control mechanisms of arginine biosynthesis in various bacteria, activities of several enzymes of the arginine pathway were measured in cells cultivated under repressed and partially derepressed conditions. Nineteen strains of bacteria tested appeared to have two types of pathways, closely related to each other. The partially derepressed levels of enzymes varied from bacterium to bacterium. The degree of inhibition of enzyme 2 (the second of eight enzymes concerned with arginine biosynthesis) and the repressibility of enzymes by arginine also appeared to vary from species to species. On the other hand, enzyme 2 was found to be the site of end-product inhibition only in the bacteria having a particular pathway. These results suggest that the bacteria have their own species-specific control mechanisms and that there is a pathway-specific pattern of control in arginine biosynthesis. The implications of the results are discussed from the viewpoint of evolution of control mechanisms.
uda ka,重三(日本东京文京区小宫町理化研究所)。细菌中精氨酸生物合成的途径特异性调控模式。《细菌学杂志》91:617 - 621。1966年。——为比较不同细菌中精氨酸生物合成的调控机制,在阻遏和部分去阻遏条件下培养的细胞中测量了精氨酸途径中几种酶的活性。测试的19种细菌菌株似乎有两种彼此密切相关的途径。酶的部分去阻遏水平因细菌而异。酶2(与精氨酸生物合成相关的八种酶中的第二种)的抑制程度以及精氨酸对酶的阻遏能力似乎也因物种而异。另一方面,仅在具有特定途径的细菌中发现酶2是终产物抑制的位点。这些结果表明细菌具有其自身物种特异性的调控机制,并且在精氨酸生物合成中存在途径特异性的调控模式。从调控机制进化的角度讨论了这些结果的意义。