An E. coli B mutation, rpoB5081, that prevents growth of phage T4 strains defective in host DNA degradation.

An E. coli B mutation, rpoB5081, that prevents growth of phage T4 strains defective in host DNA degradation.
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大肠杆菌 B 突变 rpoB5081 可阻止宿主 DNA 降解缺陷的噬菌体 T4 菌株的生长。

DOI:
10.1111/j.1574-6968.1997.tb12760.x
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发表时间:
1997
影响因子:
2.1
通讯作者:
Ballard,DN
Ballard,DN
中科院分区:
生物学4区
文献类型:
--
作者:
Miller,ES;Shih,GC;Chang,SK;Ballard,DN

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AnE.分离出在37°C及以上限制T4 denA(DNA内切核酸酶II)突变体,但在所有检测温度下允许野生型T4的coliB Tab菌株EM 121。在42°C下,影响核酸代谢的其他突变体(T4 dexA、regA和W菌株)也受到限制。遗传分析显示,RNA聚合酶β亚基基因中的一个突变(rpoB 5081)足以限制alldenA突变体。rpoB 5081,连同第二个连锁突变,也需要限制其他T4突变体。coliK-12引起T4晚期蛋白合成延迟和DNA合成减少。因此,当宿主DNA降解减少时,T4 DNA合成和基因表达被therpoB 5081 β亚基损害。由于限制性T4突变体在典型的平板条件下不容易与野生型噬菌体区分,因此EM 121是筛选和定位T4 denA突变的重要宿主。
AnE. coliB Tab strain, EM121, was isolated that restricts T4denA(DNA endonuclease II) mutants at 37°C and above, but is permissive for wild-type T4 at all temperatures examined. At 42°C, other mutants affected in nucleic acid metabolism (T4dexA,regAanduvsWstrains) are also restricted. Genetic analysis revealed that one mutation (rpoB5081) in the RNA polymerase β subunit gene is sufficient for restricting alldenAmutants.rpoB5081, together with a second linked mutation, is also required for restricting the other T4 mutants.rpoB5081(P806S), previously shown to increase transcription termination inE. coliK-12, causes delayed synthesis of T4 late proteins and reduced DNA synthesis indenAinfections. Thus, T4 DNA synthesis and gene expression are impaired by therpoB5081β subunit when degradation of host DNA is reduced. Because the restricted T4 mutants are not readily distinguished from wild-type phage under typical plating conditions, EM121 is an important host for screening and mapping T4denAmutations.
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