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J. Biol. Chem., Vol. 276, Issue 27, 25541-25548, July 6, 2001
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§,
,
,
,
From the To examine the interaction of mammalian base
excision repair (BER) enzymes with DNA intermediates formed during BER,
we used a novel photoaffinity labeling probe and mouse embryonic
fibroblast cellular extracts. The probe was formed in situ,
using an end-labeled oligonucleotide containing a synthetic abasic
site; this site was incised by apurinic/apyrimidinic endonuclease
creating a nick with 3'-hydroxyl and 5'-reduced sugar phosphate groups
at the margins, and then a dNMP carrying a photoreactive adduct was
added to the 3'-hydroxyl group. With near-UV light (312 nm) exposure of
the extract/probe mixture, six proteins were strongly labeled. Four of
these include poly(ADP-ribose) polymerase-1 (PARP-1) and the BER
participants flap endonuclease-1, DNA polymerase
Laboratory of Structural Biology, NIEHS,
National Institutes of Health,
Research Triangle Park, North Carolina 27709, the
§ Novosibirsk Institute of Bioorganic Chemistry, Siberian
Division of Russian Academy of Sciences, 630090 Novosibirsk, Russia,
and the ¶ Pacific Northwest National Laboratory,
Richland, Washington 99352
, and apurinic/apyrimidinic endonuclease. The amount of the probe
cross-linked to PARP-1 was greater than that cross-linked to the other
proteins. The specificity of PARP-1 labeling was examined using various competitor oligonucleotides and DNA probes with alternate structures. PARP-1 labeling was stronger with a DNA representing a BER intermediate than with a nick in double-stranded DNA. These results indicate that
proteins interacting preferentially with a photoreactive BER
intermediate can be selected from the crude cellular extract.
To whom correspondence should be addressed: Laboratory of
Structural Biology, NIEHS, National Institutes of Health, 111 T.W. Alexander Dr., Research Triangle Park, NC 27709. Tel.: 919-541-3267; Fax: 919-541-3592; E-mail: wilson5@niehs.nih.gov.
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