Exodeoxyribonuclease 7 large subunit

UniProtKB accession:  P04994

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UniProtKB description:  Bidirectionally degrades single-stranded DNA into large acid-insoluble oligonucleotides, which are then degraded further into small acid-soluble oligonucleotides. It can degrade 3' or 5' ss regions extending from the termini of duplex DNA molecules and displaced ss regions. It can also excise thymine dimers in vitro (PubMed:4602029, PubMed:4602030, PubMed:22718974) (Probable). ssDNA-binding requires both subunits (PubMed:22718974). Required for production of the mature 5'-end of retron Ec78 or Ec83 msDNA. Overproduction of this subunit in the absence of an equivalent quantity of the small subunit is toxic, causing cell elongation and chromosome fragmentation or loss; its toxicity is mostly suppressed by RecA (PubMed:26626352).