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影响鼠伤寒沙门氏菌中噬菌体BF23和大肠杆菌素敏感性的基因。

Genes affecting coliphage BF23 and E colicin sensitivity in Salmonella typhimurium.

作者信息

Guterman S K, Wright A, Boyd D H

出版信息

J Bacteriol. 1975 Dec;124(3):1351-8. doi: 10.1128/jb.124.3.1351-1358.1975.

Abstract

Rough strains of Salmonella typhimurium were sensitive to coliphage BF23. Spontaneous mutants resistant to BF23 (bfe) were isolated, and the trait was mapped using phage P1. The bfe gene in S. typhimurium was located between argF (66% co-transducible) and rif (61% co-transducible). The BF23-sensitive S. typhimurium strains were not sensitive to the E colicins. Cells of these rough strains absorbed colicin, as measured by loss of E2 or E3 killing units from colicin solutions and by specific adsorption of 125I-colicin E2 to bfe+ cells. Sensitivity to colicins E1, E2, and E3 was observed in a S. typhimurium strain carrying the F'8 gal+ episome. This episome complemented the tolB mutation of Escherichia coli. We conclude that the bfe+ protein satisfies requirements for adsorption of both phage BF23 and the E colicins. In addition, expression of a gene from E. coli, possibly tolB, is necessary for efficient E colicin killing of S. typhimurium.

摘要

鼠伤寒沙门氏菌粗糙菌株对大肠杆菌噬菌体BF23敏感。分离出了对BF23(bfe)具有抗性的自发突变体,并使用噬菌体P1对该性状进行了定位。鼠伤寒沙门氏菌中的bfe基因位于argF(共转导率66%)和rif(共转导率61%)之间。对BF23敏感的鼠伤寒沙门氏菌菌株对大肠杆菌素不敏感。通过大肠杆菌素溶液中E2或E3杀伤单位的损失以及125I-大肠杆菌素E2对bfe+细胞的特异性吸附来测定,这些粗糙菌株的细胞吸收了大肠杆菌素。在携带F'8 gal+附加体的鼠伤寒沙门氏菌菌株中观察到了对大肠杆菌素E1、E2和E3的敏感性。该附加体补充了大肠杆菌的tolB突变。我们得出结论,bfe+蛋白满足噬菌体BF23和大肠杆菌素吸附的要求。此外,大肠杆菌中一个可能是tolB的基因的表达对于大肠杆菌素有效杀死鼠伤寒沙门氏菌是必要的。

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