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Related Experiment Video

Updated: Jun 16, 2026

Stability and Structure of Bat Major Histocompatibility Complex Class I with Heterologous β2-Microglobulin

Stability and Structure of Bat Major Histocompatibility Complex Class I with Heterologous β₂-Microglobulin

Published on: March 10, 2021

MutLalpha and proliferating cell nuclear antigen share binding sites on MutSbeta.

Ravi R Iyer¹, Anna Pluciennik, Jochen Genschel

¹Department of Biochemistry, Duke University Medical Center, Durham, North Carolina 27710, USA.

The Journal of Biological Chemistry

|February 16, 2010

Summary

MutSbeta (MSH2-MSH3) interacts with PCNA, impacting DNA repair and disease. Its PCNA-binding motif is crucial for MutLalpha interaction and mismatch repair, revealing distinct mechanisms from MutSalpha.

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Measuring TCR-pMHC Binding In Situ using a FRET-based Microscopy Assay

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Published on: October 30, 2015

Area of Science:

Molecular Biology
Genetics
Biochemistry

Background:

MutSbeta (MSH2-MSH3) is involved in DNA repair and triplet repeat expansions linked to neurological disorders.
DNA repair proteins often interact with proliferating cell nuclear antigen (PCNA) through conserved motifs.
Understanding these interactions is key to deciphering DNA repair pathways and disease mechanisms.

Purpose of the Study:

To investigate the interaction between MutSbeta and PCNA.
To elucidate the role of the PCNA-binding motif of MutSbeta in protein complex formation and DNA repair.
To compare the mechanisms of MutSbeta and MutSalpha in DNA repair.

Main Methods:

Biochemical assays to determine MutSbeta-PCNA complex affinity and stoichiometry.
Conformational studies to analyze protein-protein association.
Site-directed mutagenesis to probe the function of the PCNA-binding motif.
In vitro assays to assess MutLalpha interaction and endonuclease activity.

Main Results:

MutSbeta forms a 1:1 complex with PCNA with high affinity (approx. 0.1 microM).
The PCNA-binding motif of MutSbeta is essential for MutLalpha interaction, MutLalpha endonuclease activation, and bidirectional mismatch repair.
PCNA competes with MutLalpha for MutSbeta binding, an interaction modulated by p21(CIP1).
Residues within the MutSbeta PCNA-binding motif mediate interactions with both PCNA and MutLalpha.

Conclusions:

The PCNA-binding motif of MutSbeta plays a dual role, mediating interactions with both PCNA and MutLalpha.
MutSbeta- and MutSalpha-mediated DNA repair pathways exhibit fundamental differences.
These findings provide insights into the regulation of DNA repair and the molecular basis of neurological diseases caused by triplet repeat expansions.