Bromoacetaldehyde reacted with adenosine 5'-phosphate and cytidine more rapidly than chloroacetaldehyde to give 1, N6-ethenoadenosine 5'-phosphate and 3, N4-ethenocytidine, respectively. The pH-dependence of the rates of these reactions was similar to that of the chloroacetaldehyde modifications reported in the literature ; i.e. the reactions proceed smoothly in the pH range of 5 to 7. When applied to polynucleotides, bromoacetaldehyde reacted with adenine and cytosine residues located in single-stranded regions but not with those in double-stranded regions. Guanosine 5'-phosphate reacted with bromoacetaldehyde at pH 7 but only very slowly at pH 5. Bromoacetaldehyde may be useful as a more reactive subtitute for chloroacetaldehyde. Bromoacetaldehyde showed little mutagenic activity when assayed on Salmonella typhymurium TA 100.
溴乙醛与
腺苷5'-
磷酸和
胞苷的反应速率比
氯乙醛更快,分别生成1,N6-
乙烯基腺苷5'-
磷酸和3,N4-
乙烯基胞苷。这些反应的pH依赖性与文献中报道的
氯乙醛修饰反应相似;即反应在pH 5至7的范围内顺利进行。当应用于多聚核苷酸时,
溴乙醛与位于单链区域的
腺嘌呤和
胞嘧啶残基发生反应,而不与双链区域的这些残基反应。
鸟苷5'-
磷酸在pH 7时与
溴乙醛反应,但在pH 5时仅非常缓慢地反应。
溴乙醛可能作为
氯乙醛的一个更具反应活性的替代品。在检测于鼠伤寒沙门氏菌TA 100时,
溴乙醛显示出很低的诱变活性。