Abstract
Many of the XbaI, EcoRI *, Kpnl, and BglII fragments of bacteriophage SPO1, accounting for about 65% of the genomic sequences, were cloned in Bacillus subtilis. Four of the EcoRI * fragments were specifically refractory to cloning in both Escherichia coli and B. subtilis, probably because of expression of deleterious genes carried on the SPO1 fragments. To permit complete identification of the regions cloned, the SPO1 restriction map has been extended to include the Xbal fragments and the previously unmapped KpnI fragments. Markers for 26 of the 39 known genes have been located on specific cloned fragments, permitting more precise determination of the positions of most of the genes. One cloned SPO1 fragment was inhibitory to SPO1 development.
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