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J Virol. Oct 1985; 56(1): 40–48.
PMCID: PMC252466

Mapping the genes in the terminal redundancy of bacteriophage SPO1 with restriction endonucleases.

Abstract

Although most early transcription from SPO1, a lytic DNA bacteriophage of Bacillus subtilis, is specified by the 12.6-kilobase region of the terminal redundancy, early genes from this region have not been identified by standard genetic means. We mapped genes to DNA regions of the SPO1 terminal redundancy by analyzing in vitro protein synthesis from isolated SPO1 restriction fragments in an Escherichia coli-coupled transcription-translation cell-free system. DNA from the terminal redundancy directs the synthesis in vitro of eleven proteins, e3, e4, e6, e7, e9, e12, e15, e16, e18, e20, and e21, which correspond in mobility on sodium dodecyl sulfate-polyacrylamide gels with authentic SPO1 early proteins. From their mapped positions on the DNA, genes were positioned downstream from most, but not all, of the twelve early promoter regions identified in vitro in the terminal redundancy. The temporal patterns of early protein synthesis in vivo suggest a differential turning on and off of early promoters in the terminal redundancy. Both in vivo and in vitro evidence suggests the existence of previously unidentified early promoter regions upstream from the genes for e6 and e4 as well as a middle promoter region upstream from the gene for e16.

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