Human exonuclease I interacts with the mismatch repair protein hMSH2.
DNA mismatch repair (MMR) plays a vital role in the faithful replication of DNA, and its inactivation leads to a mutator phenotype that has been associated with the common cancer susceptibility syndrome Hereditary Non-Polyposis Colorectal Cancer (HNPCC). Here, we report on a novel human exonuclease (hExoI) that is related to the yeast exonuclease 1. The hExoI cDNA comprises 2541 bp, which code for a Mr 94,000 protein that appears to be highly expressed in testis tissue and at very low levels in other tissues. The hExoI gene has 14 exons and is located on chromosome 1q43, as determined by fluorescence in situ hybridization and radiation hybrid mapping. hExoI was found to interact strongly with the human MMR protein hMSH2, suggesting its involvement in the MMR process and/or DNA recombination.
Schmutte
C
C
Department of Microbiology and Immunology, Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, Pennsylvania 19107, USA. cschmuttt@hendrix.jci.tju.edu
Marinescu
R C
RC
Sadoff
M M
MM
Guerrette
S
S
Overhauser
J
J
Fishel
R
R
D000595:Amino Acid Sequence; D001483:Base Sequence; D002874:Chromosome Mapping; D004260:DNA Repair; D045643:DNA Repair Enzymes; D004268:DNA-Binding Proteins; D005090:Exodeoxyribonucleases / Q000235:genetics / Q000378:metabolism*; D006801:Humans; D008969:Molecular Sequence Data; D051718:MutS Homolog 2 Protein; D016133:Polymerase Chain Reaction; D011518:Proto-Oncogene Proteins / Q000378:metabolism*
D004268:DNA-Binding Proteins; D011518:Proto-Oncogene Proteins; C114331:EXO1 protein, human; D005090:Exodeoxyribonucleases; C028450:exodeoxyribonuclease I; C497172:MSH2 protein, human; D051718:MutS Homolog 2 Protein; D045643:DNA Repair Enzymes