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Related Experiment Videos

Dynamic association of trigger factor with protein substrates.

R Maier1, C Scholz, F X Schmid

  • 1Laboratorium für Biochemie, Universität Bayreuth, D-95440 Bayreuth, Germany.

Journal of Molecular Biology
|December 18, 2001
PubMed
Summary

Trigger factor, a ribosome-bound helper, aids protein folding by catalyzing prolyl isomerization. Its rapid binding and release minimize interference with fast-folding proteins, ensuring efficient protein folding.

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Area of Science:

  • Molecular Biology
  • Protein Folding
  • Biochemistry

Background:

  • Trigger factor is a ribosome-associated chaperone.
  • It possesses both protein chaperoning and prolyl isomerization activities.

Purpose of the Study:

  • To investigate the dual functions of trigger factor in protein folding.
  • To analyze the kinetics of trigger factor binding and its impact on protein conformational changes.

Main Methods:

  • In vitro protein folding assays.
  • Kinetic analysis of trigger factor-substrate protein interactions.
  • Comparison of trigger factor and DnaK binding mechanisms.

Main Results:

  • Trigger factor can retard in vitro folding of proteins with native prolyl isomers.

Related Experiment Videos

  • Rapid binding and release kinetics minimize trigger factor's adverse effects on folding.
  • Trigger factor exhibits nucleotide-independent binding, favoring catalytic activity.

    • Conclusions:

    • Trigger factor's interaction with substrate proteins is transient, allowing fast-folding proteins to escape.
    • Proteins with incorrect prolyl isomers can rebind trigger factor for further catalysis.
    • The synthetic lethality of DnaK and trigger factor disruption suggests complex interdependence in protein homeostasis.