title: Restoration of mismatch repair to nuclear extracts of H6 colorectal tumor cells by a heterodimer of human MutL homologs.
abstract: Hypermutable H6 colorectal tumor cells are defective in strand-specific mismatch repair and bear defects in both alleles of the hMLH1 gene. We have purified to near homogeneity an activity from HeLa cells that complements H6 nuclear extracts to restore repair proficiency on a set of heteroduplex DNAs representing the eight base-base mismatches as well as a number of slipped-strand, insertion/deletion mispairs. This activity behaves as a single species during fractionation and copurifies with proteins of 85 and 110 kDa. Microsequence analysis demonstrated both of these proteins to be homologs of bacterial MutL, with the former corresponding to the hMLH1 product and the latter to the product of hPMS2 or a closely related gene. The 1:1 molar stoichiometry of the two polypeptides and their hydrodynamic behavior indicate formation of a heterodimer, which we have designated hMutL alpha. These observations indicate that interactions between members of the family of human MutL homologs may be restricted.
authors.affiliation: Department of Biochemistry, Duke University Medical Center, Durham, NC.
authors.forename: G M
authors.initials: GM
authors.lastname: Li
authors.forename: P
authors.initials: P
authors.lastname: Modrich
mesh_terms: D048868:Adaptor Proteins, Signal Transducing; D000251:Adenosine Triphosphatases; D000595:Amino Acid Sequence; D001426:Bacterial Proteins / Q000235:genetics / Q000378:metabolism*; D002352:Carrier Proteins; D002460:Cell Line; D002467:Cell Nucleus / Q000378:metabolism*; D002499:Centrifugation, Density Gradient; D002845:Chromatography; D002852:Chromatography, Ion Exchange; D015179:Colorectal Neoplasms; D004260:DNA Repair; D017886:Durapatite; D004926:Escherichia coli / Q000378:metabolism; D029968:Escherichia coli Proteins; D006367:HeLa Cells; D006801:Humans; D007700:Kinetics; D046911:Macromolecular Substances; D008969:Molecular Sequence Data; D000070957:MutL Protein Homolog 1; D000070956:MutL Proteins; D009363:Neoplasm Proteins / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism*; D009687:Nuclear Proteins; D017386:Sequence Homology, Amino Acid; D014407:Tumor Cells, Cultured
chemical_list: D048868:Adaptor Proteins, Signal Transducing; D001426:Bacterial Proteins; D002352:Carrier Proteins; D029968:Escherichia coli Proteins; C501486:MLH1 protein, human; D046911:Macromolecular Substances; C074770:MutL protein, E coli; D009363:Neoplasm Proteins; D009687:Nuclear Proteins; D017886:Durapatite; D000251:Adenosine Triphosphatases; D000070957:MutL Protein Homolog 1; D000070956:MutL Proteins