Cleavage of insertion/deletion mismatches, flap and pseudo-Y DNA structures by deoxyinosine 3'-endonuclease from Escherichia coli.

The Journal of Biological Chemistry
M Yao, Y W Kow

Abstract

Deoxyinosine 3'-endonuclease, an Escherichia coli repair enzyme that recognizes and cleaves DNA containing deoxyinosine and base mismatches, can cleave heteroduplexes containing a hairpin or unpaired loop. These DNA structures, referred to as insertion/deletion mismatches (IDM), are abnormal intermediate structures generated during replication of repetitive DNA sequences. In addition, the enzyme also cleaved the 5'-single-stranded tails of flap and pseudo-Y DNA structures, suggesting that deoxyinosine 3'-endonuclease is a bacterial functional homologue of human FEN1 and yeast RTH1 nucleases. These biochemical properties suggest that deoxyinosine 3'-endonuclease might be important in the repair of IDM structures generated in lagging strand during DNA replication.

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