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Molecular and Cellular Biology, August 2002, p. 5938-5945, Vol. 22, No. 16
0270-7306/02/$04.00+0     DOI: 10.1128/MCB.22.16.5938-5945.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Molecular Anatomy of the Human Excision Nuclease Assembled at Sites of DNA Damage

Joyce T. Reardon1 and Aziz Sancar1*

Department of Biochemistry and Biophysics, University of North Carolina School of Medicine, Chapel Hill, North Carolina 275991

Received 12 April 2002/ Returned for modification 20 May 2002/ Accepted 23 May 2002

Human nucleotide excision repair is initiated by six repair factors (XPA, RPA, XPC-HR23B, TFIIH, XPF-ERCC1, and XPG) which sequentially assemble at sites of DNA damage and effect excision of damage-containing oligonucleotides. We here describe the molecular anatomy of the human excision nuclease assembled at the site of a psoralen-adducted thymine. Three polypeptides, primarily positioned 5' to the damage, are in close physical proximity to the psoralen lesion and thus are cross-linked to the damaged DNA: these proteins are RPA70, RPA32, and the XPD subunit of TFIIH. While both XPA and XPC bind damaged DNA and are required for XPD cross-linking to the psoralen-adducted base, neither XPA nor XPC is cross-linked to the psoralen adduct. The presence of other repair factors, in particular TFIIH, alters the mode of RPA binding and the position of its subunits relative to the psoralen lesion. Based on these results, we propose that RPA70 makes the initial contact with psoralen-damaged DNA but that within preincision complexes, it is RPA32 and XPD that are in close contact with the lesion.

* Corresponding author. Mailing address: Department of Biochemistry and Biophysics, Mary Ellen Jones Bldg, CB# 7260, University of North Carolina School of Medicine, Chapel Hill, NC 27599-7260. Phone: (919) 962-0115. Fax: (919) 843-8627. E-mail: aziz_sancar{at}med.unc.edu.

Molecular and Cellular Biology, August 2002, p. 5938-5945, Vol. 22, No. 16
0022-538X/02/$04.00+0     DOI: 10.1128/MCB.22.16.5938-5945.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.



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