作者:Masahito SuiKo、Eiji Taniguchi、Kazuyuki Maekawa、Morifusa Eto
DOI:10.1080/00021369.1980.10864221
日期:1980.8
When DNA-dependent RNA polymerase from Ehrlich ascites tumor cells (E-cells) was directly incubated with 2-ethylsulfonyl-7-methyl-5H-1,3,4-thiadiazolo[3,2-a]pyrimidin-5-one (TPSO2-2) and dialyzed to remove the chemical, its transcriptive activity was suppressed. The inhibition of enzyme activity was not restored by the addition of substrates. TPSO2-2 alkylated alcohols in the presence of amines. An alkylthio derivative which had no repressing effect on E-cell propagation did not react with alcohols. TPSO2-2 showed a high inhibitory effect against “SH enzyme,” such as yeast alcohol dehydrogenase, but was scarcely inhibited by an alkylthio derivative. TPSO2-2 reacted with l-cysteine. It is presumed that the reactivity of the 2-position of 1,3,4-thiadiazolo[3,2-a]-pyrimidines is responsible for biological activity and that RNA polymerase is inactivated by the alkylation of the SH or OH group with TPSO2-2.
当将艾氏腹水瘤细胞(E-细胞)的 DNA 依赖性 RNA 聚合酶直接与 2-乙基磺酰基-7-甲基-5H-1,3,4-噻二唑并[3,2-a]嘧啶-5-酮(TPSO2-2)孵育并透析去除该化学物质时,其转录活性受到抑制。加入底物也无法恢复酶活性的抑制作用。TPSO2-2 在胺的存在下烷基化醇。一种对 E 细胞繁殖没有抑制作用的烷硫基衍生物不与醇类发生反应。TPSO2-2 对 "SH 酶"(如酵母醇脱氢酶)有很强的抑制作用,但对烷硫基衍生物几乎没有抑制作用。TPSO2-2 与 l-半胱氨酸发生反应。据推测,1,3,4-噻二唑并[3,2-a]-嘧啶的 2 位反应性是其生物活性的原因,RNA 聚合酶会因 TPSO2-2 的 SH 或 OH 基团烷基化而失活。