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Insertion mutagenesis of Escherichiacoli GroEL | JoVE Visualize

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Insertion mutagenesis of Escherichiacoli GroEL

Danielle Amatore¹, François Baneyx

¹Department of Chemical Engineering, Box 351750, University of Washington, Seattle 98195-1750, USA.

Biochemical and Biophysical Research Communications|February 27, 2003

View abstract on PubMed

Summary

Bacterial chaperonin GroEL folding and assembly were studied using insertion mutagenesis. Apical domain insertions caused degradation, while equatorial insertions showed varied tolerance, impacting protein folding and assembly.

Area of Science:

Molecular Biology
Protein Folding
Bacterial Proteins

Background:

Bacterial chaperonins like GroEL are essential for protein folding and assembly in vivo.
Understanding the in vivo folding and assembly mechanisms of GroEL is crucial for cellular function.

Purpose of the Study:

To investigate the effects of insertion mutagenesis on the in vivo folding and assembly of bacterial chaperonin GroEL.
To identify regions within GroEL that are critical for its stability, folding, and function.

Main Methods:

Insertion mutagenesis of the groEL gene using transposon ISlacZ/in.
Generation of GroEL-LacZ fusions and corresponding insertion mutants.
Analysis of protein stability, solubility, and chaperone activity of the mutants.

Main Results:

Apical domain insertion mutants (GroEL291, GroEL367) were degraded into fragments, with GroEL367 being soluble, suggesting apical domain completeness for folding.
An equatorial helix D insertion mutant (GroEL90) underwent complete degradation.
An equatorial insertion at position 34 (GroEL34) was tolerated but resulted in inefficient folding and a heptameric conformation.

Conclusions:

Proper isomerization of a nearly complete apical domain is necessary for efficient GroEL protomer folding.
The equatorial region of GroEL exhibits flexibility, tolerating insertions.
Mutations affecting GroEL structure impact its stability, folding efficiency, and chaperone activity.

Other Engineering

Granular Mechanics

Insertion Mutagenesis Of Escherichiacoli Groel