Long-range interactions between transcription factors

Yan Mei Wang, Jonas O. Tegenfeldt, Jim Sturm, Robert H. Austin

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


We discuss a method for analysing the number of GFP-LacI fusion transcription factors bound to a construct of 256 contiguous LacI binding sites using photon bleaching statics. We show by using a combination of imaging of the construct in nanochannels, photon statistics and addition of IGFP that the binding coefficient of the LacI decreases with increasing occupation of the construct, with a binding coefficient of 10-6 M when only 15 of the 256 possible sites are occupied. We model this effect by assuming that the GFP-LacI dimer introduces elastic strain into the helix by generalized deformations, and that this strain propagates over distances at least as large as the persistence length.

Original languageEnglish (US)
Pages (from-to)1993-1999
Number of pages7
Issue number10
StatePublished - Oct 1 2005

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • Mechanics of Materials
  • Mechanical Engineering
  • Bioengineering
  • Electrical and Electronic Engineering
  • General Materials Science


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