Some new applications of micrococcal nuclease to the elucidation of the structure of nucleic acids

Monique De Meuron-Landolt, Michel Privat de Garilhe
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引用次数: 12

Abstract

In order to obtain more information on the specificity of micrococcal nuclease (EC 3.1.4.7), three series of substances were investigated:

  • 1.

    1. The series of polypyrimidine nucleotides terminated at both ends by phosphoryl groups obtained by controlled hydrolysis of DNA.

  • 2.

    2. Polythymidylic acids obtained by chemical synthesis.

  • 3.

    3. Three naturally occuring deoxyribonucleic acids.

Using catalytic amounts of highly purified enzyme, it was shown that tri- and tetranucleotides are attacked with the liberation of the 3′-terminal nucleoside and (or) nucleotide in a stepwise manner. With pentanucleotides, exonucleolytic and endonucleolytic mechanisms of hydrolysis occur at the same rate. The fact that the enzyme attacks preferentially thymine and adenine linkages has been confirmed by using deoxyribonucleic acids containing different adenine-thymine ratios.

微球菌核酸酶在核酸结构解析中的一些新应用
为了获得更多关于微球菌核酸酶(EC 3.1.4.7)特异性的信息,对三个系列物质进行了研究:由控制的dna水解得到的两端以磷酸基结尾的多嘧啶核苷酸序列。化学合成得到的聚胸苷酸。三种自然产生的脱氧核糖核酸。使用催化量的高纯度酶,表明三核苷酸和四核苷酸被3 '端核苷和(或)核苷酸的逐步解放所攻击。对于五核苷酸,水解的核外溶和核内溶机制以相同的速率发生。该酶优先攻击胸腺嘧啶和腺嘌呤键的事实已通过使用含有不同腺嘌呤-胸腺嘧啶比例的脱氧核糖核酸得到证实。
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