Ganesan A T
J Bacteriol. 1979 Jul;139(1):270-9. doi: 10.1128/jb.139.1.270-279.1979.
In Bacillus subtilis the ability to take up deoxyribonucleic acid (DNA) and undergo genetic transformation may coincide with the induction of defective phage(s) and the expression of possibly related cryptic genes. A restriction-modification enzyme system appears to be expressed. Targets of the restriction activity on the DNA can be blocked my methylation catalyzed by the methyl transferase. It is shown that cellular DNA becomes progressively methylated and reaches the maxium level during the peak of competency. Deoxycytidine residues of both incoming donor and resident DNA are methylated. The possible participation of these enzymes in recombination and the general role of cryptic genes in inducible functions are discussed.
在枯草芽孢杆菌中,摄取脱氧核糖核酸(DNA)并进行遗传转化的能力可能与缺陷噬菌体的诱导以及可能相关的隐蔽基因的表达同时发生。一种限制修饰酶系统似乎被表达出来。DNA上限制活性的靶标可以被甲基转移酶催化的甲基化作用所阻断。结果表明,细胞DNA逐渐被甲基化,并在感受态高峰期达到最高水平。进入的供体DNA和宿主DNA的脱氧胞苷残基都被甲基化。讨论了这些酶在重组中的可能参与以及隐蔽基因在诱导功能中的一般作用。