Abstract
We have constructed lambda/SPP1 hybrid phages by in vitro ligation of EcoRI fragments of the Bacillus subtilis phage SPP1 DNA to a lambdoid bacteriophage vector. EcoRI digestion of SPP1 generated 15 DNA fragments of which 13 could be cloned. The SPP1 DNA of such hybrids was stably maintained and replicated in Escherichia coli, as indicated by marker rescue experiments in B. subtilis. EcoRI fragment 1 of SPP1 could not be cloned although subfragments of fragment 1 resulting from spontaneous deletions which occurred during the cloning regime were consistently obtained. A region within EcoRI fragment 1 responsible for its incompatibility with replication in E. coli was defined by these experiments.
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