Single-Molecule Studies of ssDNA-Binding Proteins Exchange

Olivia Yang, Taekjip Ha

Research output: Chapter in Book/Report/Conference proceedingChapter

5 Scopus citations


Single-stranded DNA-binding protein (SSB) is important not only for the protection of single-stranded DNA (ssDNA) but also for the recruitment of other proteins for DNA replication, recombination, and repair. The interaction of SSB with ssDNA is highly dynamic as it exists as an intermediate during cellular processes that unwind dsDNA. It has been proposed that SSB redistributes itself among multiple ssDNA segments, but transient intermediates are difficult to observe in bulk experiments. We can use single-molecule FRET microscopy to observe intermediates of the transfer of a single Escherichia coli SSB from one ssDNA strand to another or exchange of one SSB for another on a single ssDNA in real time. This single-molecule approach can be further applicable to understand relative binding affinities and competitive dynamics for other SSBs and variants across various systems.

Original languageEnglish (US)
Title of host publicationMethods in Enzymology
PublisherAcademic Press Inc.
Number of pages15
StatePublished - 2018

Publication series

NameMethods in Enzymology
ISSN (Print)0076-6879
ISSN (Electronic)1557-7988


  • Competition
  • Exchange
  • FRET
  • Replacement
  • SSB
  • Single molecule
  • Transfer
  • ssDNA

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology


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