Abstract
The bacteriophage Pa16, isolated from soil on Streptomyces albus G, was restricted when transferred from an alternative host back to S. albus G. Extracted unmodified Pa16 deoxyribonucleic acid was cleaved at a single site by a cell-free extract of S. albus G. Fractions cleaving Pal6 deoxyribonucleic acid contained the endonuclease SalI first described by J. Arrand, P. Myers, and R. J. Roberts (unpublished data). A mutant of S. albus G was isolated which was defective in both restriction and modification of Pal6. This mutant lacked SalI activity. It is concluded that SalI is the agent of restriction of Pal6 by S. albus G.
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