Base-unpaired regions in supercoiled replicative form DNA of coliphage M13

S. Dasgupta, D. P. Allison, C. E. Snyder, S. Mitra

Research output: Contribution to journalArticlepeer-review

27 Scopus citations


Superhelical covalently closed circular replicative form DNA (RF I) of coliphage M13 appears as a relaxed molecule that has a base-unpaired region in the form of a bubble (100 to 200 base pairs long) seen in electron micrographs when spread in the presence of formaldehyde and formamide or after pretreatment with glyoxal. S1 endonuclease, specific for single-stranded DNA, converts superhelical M13 RF I DNA, but not nonsuperhelical M13 RF I to a significant extent, into unit-length linear molecules by sequential nicking of two strands. The locations of S1 nuclease-susceptible sites and glyoxal-fixed base-unpaired regions were both related to the five A-T-rich regions in M13 RF DNA. While S1 nuclease does not show preference for any of these sites, glyoxal-fixed bubbles occur predominantly at the major A-T-rich region in M13 RF DNA.

Original languageEnglish (US)
Pages (from-to)5916-5923
Number of pages8
JournalJournal of Biological Chemistry
Issue number16
StatePublished - 1977

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology


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