The set of compounds investigated as substrates and inhibitors of bacterial cytidine aminohydrolase (EC 3.5.4.5) consists of cytidine analogues modified in the heterocyclic base or the sugar moiety and analogues of the similar type derived from l-(β-D-ribofuranosyl)-2-pyrimidone (I) and its isomers. The latter group of compounds includes also open-chain derivatives of neutral and acidic character. These compounds were prepared by novel synthetic procedures.
Minimum necessary conditions for the structure of an inhibitor of cytidine aminohydrolase from E. coli A 19 include: a heterocyclic system containing an Rf-N-CO-N(H) fragment of a basic character in which Rf denotes a β-D-aldopentafuranoside with a 3-hydroxy group of ribo-configuration; the 5-hydroxy group of the sugar moiety may bear a substituent, except a phosphomonoester function. The heterocyclic base may also bear substituents in positions other than α to the nucleoside bond which do not reduce substantially the basicity of the system and do not change the conformation of the nucleoside molecule.
研究作为细菌胞嘧啶氨水解酶(EC 3.5.4.5)底物和抑制剂的化合物集合包括在杂环碱基或糖基部分上修改的胞嘧啶类似物以及来源于l-(β-D-核糖呋喃苷)-2-嘧啶酮(I)及其异构体的类似物。后一组化合物还包括中性和酸性特性的开链衍生物。这些化合物是通过新颖的合成方法制备的。从大肠杆菌A 19的胞嘧啶氨水解酶的抑制剂结构的最低必要条件包括:含有基本性质的Rf-N-CO-N(H)片段的杂环系统,其中Rf表示带有核糖-构型的3-羟基的β-D-醛基五糖;糖基的5-羟基可能带有取代基,但不能是磷酸单酯功能团。杂环碱基还可能在不影响系统碱性和核苷酸键的构象的情况下,在核苷酸键的α位置以外带有取代基。