Modification of adenine and cytosine derivatives with bromoacetaldehyde.
作者:KIKUKO KAYASUGA-MIKADO、TERUKO HASHIMOTO、TOMOE NEGISHI、KAZUO NEGISHI、HIKOYA HAYATSU
DOI:10.1248/cpb.28.932
日期:——
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。