Studies on Inhibition of Enzymatic Arginyltransfer Reaction.
作者:Koichi TAKAO、Toshihisa IGARASHI、Hironao OGISO、Kazuya UGATA、Akira SHIRAHATA、Keijiro SAMEJIMA
DOI:10.1248/cpb.46.1169
日期:——
Synthetic polyamines and various derivatives of aspartic acid and glutamic acid were examined in vitro for their inhibitory activity on arginyl-tRNA-protein transferase. All the polyamines tested showed non-specific activation or inhibition at 0.1 or 10 mM, respectively, suggesting an interaction of polyamines with tRNA. Of the newly prepared active site directed compounds including the inhibitory peptides so far reported, L-aspartic acid α-[(S)-(-)-naphthylethylamide] was found to inhibit the enzyme activity most potently with a slight substrate activity, whereas the R-isomer showed very weak inhibition, giving information on the active site of the enzyme.
体外研究了合成多胺以及天冬氨酸和谷氨酸的各种衍生物对精氨酰-tRNA-蛋白转移酶的抑制活性。所有测试的多胺在 0.1 或 10 mM 的浓度下分别显示出非特异性的激活或抑制作用,这表明多胺与 tRNA 之间存在相互作用。在新制备的活性位点定向化合物(包括迄今报道的抑制肽)中,发现 L-天冬氨酸 α-[(S)-(-)-萘乙基酰胺]对酶活性的抑制作用最强,且有轻微的底物活性,而 R-异构体的抑制作用很弱,从而提供了有关酶活性位点的信息。