Physical nature of bacterial cytoplasm

Phys Rev Lett. 2006 Mar 10;96(9):098102. doi: 10.1103/PhysRevLett.96.098102. Epub 2006 Mar 10.

Abstract

We track the motion of individual fluorescently labeled mRNA molecules inside live E. coli cells. We find that the motion is subdiffusive, with an exponent that is robust to physiological changes, including the disruption of cytoskeletal elements. By modifying the parameters of the RNA molecule and the bacterial cell, we are able to examine the possible mechanisms that can lead to this unique type of motion, especially the effect of macromolecular crowding. We also examine the implications of anomalous diffusion on the kinetics of bacterial gene regulation, in particular, how transcription factors find their DNA targets.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Capsid Proteins / chemistry
  • Capsid Proteins / metabolism
  • Cytoplasm / chemistry*
  • Cytoplasm / metabolism*
  • DNA, Bacterial / chemistry
  • DNA, Bacterial / metabolism
  • Escherichia coli / chemistry*
  • Escherichia coli / genetics
  • Escherichia coli / metabolism*
  • Fluorescent Dyes / chemistry
  • Gene Expression Regulation, Bacterial
  • Levivirus / chemistry
  • Levivirus / metabolism
  • RNA, Messenger / chemistry
  • RNA, Messenger / metabolism
  • Transcription Factors / chemistry
  • Transcription Factors / metabolism

Substances

  • Capsid Proteins
  • DNA, Bacterial
  • Fluorescent Dyes
  • RNA, Messenger
  • Transcription Factors