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Related Experiment Videos

hMSH2 forms specific mispair-binding complexes with hMSH3 and hMSH6

S Acharya1, T Wilson, S Gradia

  • 1Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, PA 19107, USA.

Proceedings of the National Academy of Sciences of the United States of America
|November 26, 1996
PubMed
Summary
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Human mismatch repair proteins hMSH2, hMSH3, and hMSH6 form distinct complexes with overlapping DNA binding specificities. These findings illuminate mutation patterns in hereditary nonpolyposis colon cancer.

Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • The human MutS homologues (hMSH2, hMSH3, and hMSH6) are crucial for DNA mismatch repair.
  • Understanding their genetic and biochemical properties is essential for comprehending DNA repair mechanisms and associated diseases.

Purpose of the Study:

  • To characterize the genetic and biochemical properties of human MSH2, MSH3, and MSH6 proteins.
  • To investigate the complex formation and DNA binding specificities of these proteins.
  • To correlate these findings with mutation distributions in hereditary nonpolyposis colon cancer.

Main Methods:

  • Isolation and characterization of full-length hMSH6 cDNA and genomic locus.
  • Analysis of hMSH3 cDNA for variations.
  • Examination of tissue-specific expression patterns of hMSH2, hMSH3, and hMSH6.

Related Experiment Videos

  • Protein complex formation assays (homomultimer and heterodimer).
  • Mismatch nucleotide-binding specificity analysis of protein complexes.

    • Main Results:

    • The hMSH6 gene was mapped to chromosome 2p15-16 and found to have 10 exons.
    • hMSH3 cDNA exhibited variations, including a 27-bp deletion in some individuals.
    • hMSH2, hMSH3, and hMSH6 displayed similar tissue-specific expression.
    • hMSH2 formed complexes with hMSH3 and hMSH6, and also a homomultimer.
    • hMSH3 and hMSH6 did not form homomultimers or heterodimers with each other.
    • The hMSH2-hMSH3 and hMSH2-hMSH6 complexes demonstrated overlapping, but not identical, mismatch binding specificities.

    Conclusions:

    • The distinct protein complex formation and specific DNA binding properties of hMSH2, hMSH3, and hMSH6 contribute to the observed mutation patterns in hereditary nonpolyposis colon cancer.
    • These findings provide molecular insights into the functional diversity of human mismatch repair proteins.