Gel electrophoretic analysis of bacteriophage assembly intermediates in bacteriophage plaques.

P. Serwer, S. J. Hayes, R. H. Watson, S. A. Khan

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

To increase the efficiency with which the phenotype of bacteriophage mutants is determined by gel electrophoresis, procedures are developed here for the preparation of the contents of bacteriophage plaques for gel electrophoresis. During the formation of plaques, the plaque-supporting upper layer gel is changed from the traditional agar gel to a gel made of a mixture of low-melt agaroses; the lower layer gel is eliminated. To extract particles from plaques, the plaque-supporting gel is disintegrated by both shaking and raising the temperature to 39-43 degrees C. During shaking, the gel is broken to domains that are 5-30 microns in diameter. After extraction, the contents of plaques are subjected to two electrophoretic analyses: (1) Nondenaturing agarose gel electrophoresis is performed after treatment with DNase. This procedure reveals both mature bacteriophage and immature capsids. (2) Nondenaturing agarose gel electrophoresis is performed after release of DNA from DNase-treated capsids. This latter procedure reveals both completely packaged (mature length) DNA and incompletely packaged (shorter than mature length) DNA. The amount of mature length DNA released per 2-3 mm plaque is 10-60 ng. In agreement with results previously obtained in liquid culture, most incompletely packaged DNA has the right, but not the left, mature T7 DNA end.

Original languageEnglish (US)
Pages (from-to)211-217
Number of pages7
JournalApplied and theoretical electrophoresis : the official journal of the International Electrophoresis Society
Volume4
Issue number4
StatePublished - 1995

ASJC Scopus subject areas

  • Medicine(all)

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