噬菌体T7在鼠伤寒沙门氏菌中的生长
Growth of coliphage T7 in Salmonella typhimurium.
作者信息
Brunovskis I, Burns R O
出版信息
J Virol. 1973 May;11(5):621-9. doi: 10.1128/JVI.11.5.621-629.1973.
Abstract
A mutant of Salmonella typhimurium was found to be sensitive to killing by coliphage T7 because of an alteration in its surface properties. However, the infections were abortive and studies with (32)P-labeled T7 grown in Escherichia coli B (T7.B) indicated that the phage DNA was restricted by S. typhimurium. When a mutant T7 which survived the restriction and produced plaques on Salmonella (T7.S) was passed through one cycle of growth in E. coli B, its ability to grow in Salmonella was lost, indicating that host-controlled restriction and modification are operative in this system. Restrictionless S. typhimurium mutants were isolated that permit the growth of not only T7.S but also T7.B and coliphage T3. The physiology of T7 production in the restrictionless host is nearly identical to that in Escherichia coli.
摘要
发现鼠伤寒沙门氏菌的一个突变体对大肠杆菌噬菌体T7的杀伤敏感，原因是其表面特性发生了改变。然而，感染是流产性的，对在大肠杆菌B（T7.B）中生长的（32）P标记的T7的研究表明，噬菌体DNA受到鼠伤寒沙门氏菌的限制。当一个在限制中存活并能在沙门氏菌上形成噬菌斑的突变体T7（T7.S）在大肠杆菌B中传代培养一个周期后，其在沙门氏菌中生长的能力丧失，这表明宿主控制的限制和修饰在该系统中起作用。分离出了无限制的鼠伤寒沙门氏菌突变体，其不仅允许T7.S生长，还允许T7.B和大肠杆菌噬菌体T3生长。在无限制宿主中T7产生的生理学与在大肠杆菌中几乎相同。
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