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PMID: 11429708 Published · ppublish English Journal Article Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, P.H.S.

HNPCC mutations in the human DNA mismatch repair gene hMLH1 influence assembly of hMutLalpha and hMLH1-hEXO1 complexes.

Oncogene ·Vol. 20 ·No. 27 ·2001-06-14 ·Pages 3590-5

Jäger AC, Rasmussen M, Bisgaard HC, Singh KK, Nielsen FC, Rasmussen LJ

Abstract

Hereditary nonpolyposis colorectal cancer (HNPCC) is a common inherited form of neoplasia caused by germline mutations in DNA mismatch repair (MMR) genes. MMR proteins have been reported to associate with several proteins, including the human exonuclease 1 (hEXO1). We report here novel HNPCC-hMLH1 mutant proteins (T117M, Q426X and 1813insA) in Danish HNPCC patients. We demonstrate that these mutant HNPCC-hMLH1 proteins are unable to form complexes with hEXO1 and hPMS2 in vivo. The results indicate that mutations found in HNPCC gene carriers disrupt hMLH1-hEXO1 complex formation and hMutLalpha heterodimer assembly essential for MMR activity.

MeSH Terms
Adaptor Proteins, Signal Transducing Adenosine Triphosphatases Amino Acid Sequence Amino Acid Substitution Bacterial Proteins/chemistry,metabolism Base Pair Mismatch Carrier Proteins Colorectal Neoplasms, Hereditary Nonpolyposis/genetics DNA Repair DNA Repair Enzymes DNA Transposable Elements DNA-Binding Proteins Denmark Escherichia coli Escherichia coli Proteins Exodeoxyribonucleases/metabolism Humans Mismatch Repair Endonuclease PMS2 Molecular Sequence Data MutL Protein Homolog 1 MutL Proteins Mutation Mutation, Missense Neoplasm Proteins/chemistry,genetics,metabolism Nuclear Proteins Recombinant Fusion Proteins/chemistry,metabolism Sequence Alignment Sequence Homology, Amino Acid Whites
Chemicals
Adaptor Proteins, Signal Transducing Bacterial Proteins Carrier Proteins DNA Transposable Elements DNA-Binding Proteins Escherichia coli Proteins MLH1 protein, human MutL protein, E coli Neoplasm Proteins Nuclear Proteins Recombinant Fusion Proteins EXO1 protein, human Exodeoxyribonucleases exodeoxyribonuclease I Adenosine Triphosphatases PMS2 protein, human Mismatch Repair Endonuclease PMS2 MutL Protein Homolog 1 MutL Proteins DNA Repair Enzymes
Authors & Affiliations
6 authors, click to expand affiliations / ORCID
Jäger A C
Department of Clinical Biochemistry, Rigshospitalet, DK-2100 Copenhagen, Denmark.
Rasmussen M
Bisgaard H C
Singh K K
Nielsen F C
Rasmussen L J
Article Info
Journal
Oncogene
Abbr.
Oncogene
ISSN
0950-9232
Published
2001-06-14
Pages
3590-5
Language
English
Region
England
NLM ID
8711562
Subset
IM
Grants
PHS HHS · R01 09714-02 · United States
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