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