Recombinant Human Exonuclease 1 (EXO1), Truncated

Uniprot Id

Q9UQ84

Target Species

Human

Target Name

EXO1

Target Full Name

Exonuclease 1

Target Function

5'->3' double-stranded DNA exonuclease which may also possess a cryptic 3'->5' double-stranded DNA exonuclease activity. Functions in DNA mismatch repair (MMR) to excise mismatch-containing DNA tracts directed by strand breaks located either 5' or 3' to the mismatch. Also exhibits endonuclease activity against 5'-overhanging flap structures similar to those generated by displacement synthesis when DNA polymerase encounters the 5'-end of a downstream Okazaki fragment. Required for somatic hypermutation (SHM) and class switch recombination (CSR) of immunoglobulin genes. Essential for male and female meiosis.

Target Subcellular Location

Nucleus. Note=Colocalizes with PCNA to discrete nuclear foci in S-phase.

Target Protein Families

XPG/RAD2 endonuclease family, EXO1 subfamily

Target Tissue Specificity

Highly expressed in bone marrow, testis and thymus. Expressed at lower levels in colon, lymph nodes, ovary, placenta, prostate, small intestine, spleen and stomach.

Target Synonyms

exo1; EXO1_HUMAN; ExoI; Exonuclease 1; Exonuclease I; Exonuclease1; HEX1; hExo I; hExo1; hExoI; Rad2 nuclease family member homolog of S. cerevisiae exonuclease 1

Target Background

This gene encodes a protein with 5' to 3' exonuclease activity as well as an RNase H activity. It is similar to the Saccharomyces cerevisiae protein Exo1 which interacts with Msh2 and which is involved in mismatch repair and recombination. Alternative splicing of this gene results in three transcript variants encoding two different isoforms.