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Related Experiment Video

Updated: Jul 6, 2026

Characterization of Multi-subunit Protein Complexes of Human MxA Using Non-denaturing Polyacrylamide Gel-electrophoresis

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Published on: October 28, 2016

Gadd45 beta forms a homodimeric complex that binds tightly to MKK7.

Laura Tornatore¹, Daniela Marasco, Nina Dathan

¹Dipartimento delle Scienze Biologiche, Istituto di Biostrutture e Bioimmagini (IBB), CNR, via Mezzocannone, 16, 80134, Napoli, Italy.

Journal of Molecular Biology

|March 18, 2008

Summary

Growth arrest and DNA damage-inducible (Gadd45) beta proteins are alpha-helical and form dimers in solution. These dimers create a surface for MKK7 binding, suggesting a larger complex involved in apoptosis resistance.

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Published on: January 12, 2024

Area of Science:

Molecular Biology
Cellular Biology
Biochemistry

Background:

Gadd45 proteins (growth arrest and DNA damage-inducible factors) regulate crucial cellular processes like cell-cycle control, DNA stability, and apoptosis.
Gadd45 beta is implicated in NF-kappaB-mediated apoptosis resistance by inactivating MKK7, the JNK activator.

Purpose of the Study:

To investigate the structural properties of Gadd45 beta in solution.
To elucidate the dimerization interface of Gadd45 beta.
To understand the structural basis of Gadd45 beta interactions with MKK7.

Main Methods:

Circular dichroism spectroscopy to determine secondary structure.
Analytical ultracentrifugation to assess oligomerization state.
Structural predictions and analysis of protein-protein interactions.

Main Results:

Gadd45 beta is predominantly an alpha-helical protein in solution.
Gadd45 beta forms non-covalent dimers, not higher-order oligomers.
Dimerization involves antiparallel helix 1 and helix 5, forming a surface distinct from MKK7 binding.
A complex involving MKK7-Gadd45 beta:Gadd45 beta-MKK7 tetrameric units is suggested.

Conclusions:

Gadd45 beta's dimeric structure contributes to its function in apoptosis resistance.
The distinct dimerization and MKK7-binding surfaces suggest complex regulatory mechanisms.
Further structural studies are warranted to fully understand the MKK7-Gadd45 beta complex.