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. 1978 Sep;27(3):725–737. doi: 10.1128/jvi.27.3.725-737.1978

Bacillus subtilis bacteriophages SP82, SPO1, and phie: a comparison of DNAs and of peptides synthesized during infection.

J M Lawrie, J S Downard, H R Whiteley
PMCID: PMC525860  PMID: 100607

Abstract

The genomes of Bacillus subtilis phages phie, SPO1, and SP82 were compared by DNA-DNA hybridization, analysis of DNA fragments produced by digestion with restriction endonucleases, comparison of the arrays of peptides synthesized during infection, and phage neutralization. DNA-DNA hybridization experiments indicated that about 78% of the SP82 DNA was homologous with SPO1 DNA, whereas 40% of the phie DNA was homologous to either SPO1 or SP82 DNA. Agarose gel electrophoresis was used to compare the molecular weights of DNA fragments produced by cleavage of SP82, SPO1, and phie DNAs with the restriction endonucleases Hae III, Sal I, Hpa II, and Hha I. Digestion of the DNAs with Hae III and Sal I produced only a few fragments, whereas digestion with Hpa II and Hha I yielded 29 to 40 fragments, depending on the DNA and the enzyme. Comparing the Hpa II fragments, 51% of the SP82 fragments had mobilities which matched those of SPO1 fragments, 32% of the SP82 fragments matched the phie fragments, and 34% of the SPO1 fragments matched the phie fragments. Comparing the Hha I digestion products, 62% of the SP82 fragments had mobilities matching the SPO1 fragments, 24% of the SP82 fragments matched the phie fragments, and 22% of the SPO1 fragments matched the phie fragments. Analysis of peptides by electrophoresis on one-dimensional sodium dodecyl sulfate-polyacrylamide slab gels showed that approximately 70 phage-specific peptides were synthesized in the first 24 min of each infection. With mobility and the intervals of synthesis as criteria, 66% of the different SP82 peptides matched the SPO1 peptides, 34% of the SP82 peptides matched the phie peptides, and 37% of the SPO1 peptides matched the phie peptides. Phage neutralization assays using antiserum to SP82 yielded K values of 510 for SP82, 240 for SPO1, and 120 for phie.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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