Electrophoretic evidence that single-stranded regions of one or more nucleotides dramatically increase the flexibility of DNA

Janine Bellio Mills, Julia Promisel Cooper, Paul J Hagerman

Research output: Contribution to journalArticle

73 Citations (Scopus)

Abstract

The influence of single-stranded nicks and gaps on the flexibility of DNA has been investigated by subjecting to gel electrophoresis sets of molecules containing single-stranded regions of defined position and length. The DNA molecules were produced by ligating together synthetic oligomers that contained either nicks or single-stranded gaps of 1-4 nucleotides; the oligomer repeat lengths were 20, 21, 22, 23, or 26 bp, in order to produce nicks or gaps that were either in- or out-of-phase with the helix repeat of DNA. Nick-containing DNA molecules displayed nearly normal electrophoretic behavior, with maximum reductions in gel mobility (41°C; 12% polyacrylamide gels) of approximately 10% for 230-bp molecules containing 10 nicks. In contrast, molecules containing gaps of 2-4 nucleotides demonstrated dramatic reductions in mobility, approaching one-half of the values of their full-duplex counterparts; molecules containing 1 -nucleotide gaps displayed intermediate behavior. The observed (relative) mobilities of molecules containing gaps of more than 1 nucleotide were remarkably insensitive to temperature and to the presence of magnesium ions in the electrophoresis buffer. The central conclusion of the current study is that single-stranded gaps represent points of swivel-like character, whereas nicks retain much of the rigid character of double-helical DNA.

Original languageEnglish (US)
Pages (from-to)1797-1803
Number of pages7
JournalBiochemistry
Volume33
Issue number7
StatePublished - 1994
Externally publishedYes

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Nucleotides
Molecules
DNA
Electrophoresis
Gels
Single-Stranded DNA Breaks
Oligomers
Magnesium
Buffers
Ions
Temperature

ASJC Scopus subject areas

  • Biochemistry

Cite this

Electrophoretic evidence that single-stranded regions of one or more nucleotides dramatically increase the flexibility of DNA. / Mills, Janine Bellio; Cooper, Julia Promisel; Hagerman, Paul J.

In: Biochemistry, Vol. 33, No. 7, 1994, p. 1797-1803.

Research output: Contribution to journalArticle

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