DNA restriction and modification systems in Salmonella
Tóm tắt
Haploid hybrids between Salmonella typhimurium Hfr and Escherichia coli Fexercise two additive types of restriction and modification (SA and SB) on phage γ. System SA had been detected previously in S. typhimurium with phage L. Independent mutants in the SA and SB systems were isolated. P22- and P1-mediated transductions in S. typhimurium and in hybrids established that the genes governing these systems are independent but linked and situated counter-clockwise of serB on the map, in the order: pyrB-hsd
SA-hsd
SB-serB.
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