PMID: 7543471Aug 1, 1995Paper

Gene 19 of plasmid R1 is required for both efficient conjugative DNA transfer and bacteriophage R17 infection

Journal of Bacteriology
M BayerG Högenauer

Abstract

F-like plasmids require a number of genes for conjugation, including tra operon genes and genes traM and traJ, which lie outside the tra operon. We now establish that a gene in the "leading region," gene 19, provides an important function during conjugation and RNA phage infection. Mutational inactivation of gene 19 on plasmid R1-16 by introduction of two nonpolar stop codons results in a 10-fold decrease in the conjugation frequency. Furthermore, infection studies with the male-specific bacteriophage R17 revealed that the phage is not able to form clear plaques in Escherichia coli cells carrying an R1-16 plasmid with the defective copy of gene 19. The total number of cells infected by phage R17 is reduced by a factor of 10. Both the conjugation- and infection-attenuated phenotypes caused by the defective gene 19 can be complemented in trans by introducing gene 19 alleles encoding the wild-type protein. Restoration of the normal phenotypes is also possible by introduction of the pilT gene encoded by the unrelated IncI plasmid R64. Our functional studies and similarities of protein 19 to proteins encoded by other DNA transfer systems, as well as the presence of a conserved motif in all of these proteins (indicative for a putativ...Continue Reading

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