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J Bacteriol, April 1998, p. 1723-1728, Vol. 180, No. 7
0021-9193/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

The TolQRA Proteins Are Required for Membrane Insertion of the Major Capsid Protein of the Filamentous Phage f1 during Infection

Eva Marie Click and Robert E. Webster*

Department of Biochemistry, Duke University Medical Center, Durham, North Carolina 27710

Received 10 November 1997/Accepted 26 January 1998

Infection of Escherichia coli by the filamentous bacteriophage f1 is initiated by interaction of the end of the phage particle containing the gene III protein with the tip of the F conjugative pilus. This is followed by the translocation of the phage DNA into the cytoplasm and the insertion of the major phage capsid protein, pVIII, into the cytoplasmic membrane. DNA transfer requires the chromosomally encoded TolA, TolQ, and TolR cytoplasmic membrane proteins. By using radiolabeled phages, it can be shown that no pVIII is inserted into the cytoplasmic membrane when the bacteria contain null mutations in tolQ, -R and -A. The rate of infection can be varied by using bacteria expressing various mutant TolA proteins. Analysis of the infection process in these strains demonstrates a direct correlation between the rate of infection and the incorporation of infecting bacteriophage pVIII into the cytoplasmic membrane.

* Corresponding author. Mailing address: Department of Biochemistry, Box 3711, Duke University Medical Center, Durham, NC 27710. Phone: (919) 683-3005. Fax: (919) 684-8885. E-mail: webster{at}biochem.duke.edu.




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