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Related Experiment Videos

Normal-mode analysis suggests protein flexibility modulation throughout RNA polymerase's functional cycle.

Adam Van Wynsberghe1, Guohui Li, Qiang Cui

  • 1Graduate Program in Biophysics and Department of Chemistry and Theoretical Chemistry Institute, University of Wisconsin, 1101 University Avenue, Madison, Wisconsin 53706, USA.

Biochemistry
|October 13, 2004
PubMed
Summary
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Bacterial RNA polymerase (RNAP) flexibility was studied using block normal-mode analyses. The beta and beta

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Structural Biology

Background:

  • Bacterial RNA polymerase (RNAP) is a crucial enzyme for gene transcription.
  • Understanding RNAP's domain-scale flexibility is essential for elucidating its functional mechanisms.
  • Previous studies have provided insights into RNAP structure but lacked comprehensive analysis of its dynamic flexibility across functional states.

Purpose of the Study:

  • To investigate the domain-scale flexibility of bacterial RNAP throughout its functional cycle.
  • To quantitatively assess atomic fluctuations in different RNAP functional states.
  • To correlate flexibility patterns with RNAP's mechanistic roles.

Main Methods:

  • Block normal-mode analyses (BNM) were performed on various RNAP functional states.

Related Experiment Videos

  • A molecular mechanics (MM) force field with physical interactions was employed.
  • Homology models were utilized, necessitating the MM force field over simpler models like the elastic network model (ENM).

    • Main Results:

    • Alpha and omega subunits were found to be rigid, consistent with their structural roles.
    • The beta subunit exhibited two highly mobile domains (beta1 and beta2) whose flexibility is modulated during the functional cycle.
    • The beta2 domain and the beta' subunit demonstrated significant flexibility into and out of the DNA binding cleft, energetically supporting proposed interactions with DNA.

    Conclusions:

    • The study quantitatively characterized the domain-scale flexibility of bacterial RNAP.
    • RNAP's flexibility, particularly in the beta and beta' subunits, is integral to its function.
    • The mobile 'crab claw' pincers formed by the beta and beta' subunits are validated by these findings.