Abstract
A large plaque (LP) and a small plaque (SP) variant of PM2 bacteriophage were isolated from a mixture of the two plaque variants and were grown separately in the appropriate host bacterium,Alteromonas espejiana. They have remained pure for approximately one year from the original isolation. Restriction endonuclease analyses revealed differences in theHaeIII restriction profile between the two variants.HaeIII fragment 1 of the SP DNA was found to be smaller than the corresponding fragment from the LP variant DNA, whereas fragment 7 from the SP DNA was slightly larger than the same fragment from LP DNA. Electron microscopy of heteroduplexes formed between the DNAs from the two variants revealed that the deletion in fragment 1 mapped very close to the junction betweenHaeIII fragments 1 and 13 on the physical map of PM2 DNA. The difference in DNA length between the two variants results from addition or deletion mutations.
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Haidle, C.W., McKinney, S.H. & Robberson, D.L. PM2 bacteriophage plaque morphology mutants exhibit differences in DNA length and restriction endonuclease patterns. Current Microbiology 16, 315–320 (1988). https://doi.org/10.1007/BF01568538
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DOI: https://doi.org/10.1007/BF01568538