金黄色葡萄球菌中I型限制修饰系统的生物学特性
Biological characteristics of a type I restriction-modification system in Staphylococcus aureus.
作者信息
Sjöström J E, Löfdahl S, Philipson L
出版信息
J Bacteriol. 1978 Mar;133(3):1144-9. doi: 10.1128/jb.133.3.1144-1149.1978.
Abstract
Two restriction-modification systems, S1 and S2, are present in Staphylococcus aureus RN450 (S. Iordanescu and M. Surdeanu, J. Gen. Microbiol., 96:277-281, 1976). System S2 affects phage multiplication after both infection and transfection. Unmodified plasmid and chromosomal DNAs are also not expressed following transduction and transformation into a restrictive host. Restricted phages are, however, capable of conferring phage-mediated competence, although the state of competence does not affect the restriction-modification system. The restricting activity of system S2 is inactivated by heat treatment of the cells. An enzymatic activity that restricts unmodified phage DNA in the presence of ATP, Mg2+, and S-adenosylmethionine was recovered from cell-free extracts of a strain RN450 derivative.
摘要
金黄色葡萄球菌RN450中存在两种限制修饰系统，即S1和S2（S. 约尔达内斯库和M. 苏尔德亚努，《普通微生物学杂志》，96:277 - 281, 1976）。系统S2在感染和转染后都会影响噬菌体繁殖。未修饰的质粒和染色体DNA在转导和转化进入限制宿主后也不表达。然而，受限噬菌体能够赋予噬菌体介导的感受态，尽管感受态状态不影响限制修饰系统。通过对细胞进行热处理可使系统S2的限制活性失活。从一株RN450衍生物的无细胞提取物中回收了一种在ATP、Mg2 +和S -腺苷甲硫氨酸存在下限制未修饰噬菌体DNA的酶活性。
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