Abstract:
:The E. coli single-stranded binding protein (SSB) has been demonstrated in vitro to be involved in a number of replicative, DNA renaturation, and protective functions. It was shown previously that SSB can interact with exonuclease I to stimulate the hydrolysis of single-stranded DNA. We demonstrate here that E. coli SSB can also enhance the DNA deoxyribophosphodiesterase (dRpase) activity of exonuclease I by stimulating the release of 2-deoxyribose-5-phosphate from a DNA substrate containing AP endonuclease-incised AP sites, and the release of 4-hydroxy-2-pentenal-5-phosphate from a DNA substrate containing AP lyase-incised AP sites. E. coli SSB and exonuclease I form a protein complex as demonstrated by Superose 12 gel filtration chromatography. These results suggest that SSB may have an important role in the DNA base excision repair pathway.
journal_name
Nucleic Acids Resjournal_title
Nucleic acids researchauthors
Sandigursky M,Franklin WAdoi
10.1093/nar/22.2.247subject
Has Abstractpub_date
1994-01-25 00:00:00pages
247-50issue
2eissn
0305-1048issn
1362-4962journal_volume
22pub_type
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