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Journal of Bacteriology, March 2004, p. 1591-1597, Vol. 186, No. 6
0021-9193/04/$08.00+0     DOI: 10.1128/JB.186.6.1591-1597.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.

H Protein of Bacteriophage 16-3 and RkpM Protein of Sinorhizobium meliloti 41 Are Involved in Phage Adsorption

Department of Genetics and Molecular Biology, Faculty of Sciences, University of Pécs, H-7601 Pécs, Hungary

Received 4 August 2003/ Accepted 2 December 2003

The strain-specific capsular polysaccharide KR5 antigen of Sinorhizobium meliloti 41 is required both for invasion of the symbiotic nodule and for the adsorption of bacteriophage 16-3. In order to know more about the genes involved in these events, bacterial mutants carrying an altered phage receptor were identified by using host range phage mutants. A representative mutation was localized in the rkpM gene by complementation and DNA sequence analysis. A host range phage mutant isolated on these phage-resistant bacteria was used to identify the h gene, which is likely to encode the tail fiber protein of phage 16-3. The nucleotide sequences of the h gene as well as a host range mutant allele were also established. In both the bacterial and phage mutant alleles, a missense mutation was found, indicating a direct contact between the RkpM and H proteins in the course of phage adsorption. Some mutations could not be localized in these genes, suggesting that additional components are also important for bacteriophage receptor recognition.

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