Recent highlights from atomic force microscopy of DNA

J Biomol Struct Dyn. 2000:17 Suppl 1:271-5. doi: 10.1080/07391102.2000.10506631.

Abstract

Abstract Seven recent highlights are presented from atomic force microscopy (AFM) of DNA in this lab. The first two involve advances in the observation of enzymatic reactions in near-physiological solutions. E. coli RNA polymerase was observed to process along its DNA template in a series of time-lapse images [S. Kasas, et al., Biochemistry 36, 461 (1997)], and a new small-cantilever atomic force microscope (AFM) imaged DNA degradation by DNase I at rates as fast as two seconds per image. The next five highlights involve structural observations of DNA and DNA-protein complexes, including DNA condensed for gene delivery, sequence-dependent DNA condensation, an AFM assay for RNA polymerase, and AFM evidence for a yeast kinetochore complex that may be involved in holding together sister chromatids during cell division.

MeSH terms

  • DNA / chemistry
  • DNA-Directed RNA Polymerases / metabolism
  • Escherichia coli* / metabolism
  • Microscopy, Atomic Force*

Substances

  • DNA
  • DNA-Directed RNA Polymerases