Interruption-deficient Mutants of Bacteriophage T5. II. Properties of a Mutant Lacking a Specific Interruption

Overview

Journal J Virol

Publisher American Society for Microbiology

Date 1979 Feb 1

PMID 430607

Citations 5

Authors

S G Rogers

N V Hamlett

M Rhoades

Affiliations

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Abstract

An examination was made of the properties of T5HA4, a mutant of bacteriophage T5 that lacks the single-chain interruption that occurs at 7.9% from the left end of the genome. The DNAs of T5HA4 and the wild type were compared by electrophoresis in agarose gels of both single-stranded fragments produced by denaturation and duplex fragments generated by sequential treatment with exonuclease III and SI nuclease. These studies demonstrated that T5HA4 also lacks an interruption that occurs at 99.6% in wild-type DNA. The interruptions at 7.9 and 99.6% therefore occur within the 8.3% of T5 DNA that is terminally repetitious. Evidence on the location of other interruptions within the terminal repetition was also obtained. Analysis of T5HA4 with a restriction endonuclease indicated that the interruption deficiency is not due to a deletion or addition mutation. The injection of T5HA4 DNA into a host bacterium was found to occur, as with the wild type, in a two-step manner. The interruption at 7.9% is therefore not required for stopping DNA transfer after the initial 8% segment has been injected.

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