Subunits of human replication protein A are crosslinked by photoreactive primers synthesized by DNA polymerases

Nucleic Acids Res. 1998 Jan 15;26(2):602-7. doi: 10.1093/nar/26.2.602.


Human replication protein A (huRPA) is a multisubunit protein which is involved in DNA replication, repair and recombination processes. It exists as a stable heterotrimer consisting of p70, p32 and p14 subunits. To understand the contribution of huRPA subunits to DNA binding we applied the photoaffinity labeling technique. The photoreactive oligonucleotide was synthesized in situ by DNA polymerases. 5-[N-(2-nitro-5-azidobenzoyl)-trans -3-aminopropenyl-1]deoxyuridine-5'-triphosphate (NABdUTP) was used as substrate for elongation of a radiolabeled primer logical ortemplate either by human DNA polymerase alpha primase (polalpha), human DNA polymerase beta (polbeta) or Klenow fragment of Escherichia coli DNA polymerase I (KF). The polymerase was incubated with NABdUTP and radiolabeled primer-template in the presence or absence of huRPA. The reaction mixtures were then irradiated with monochromatic UV light (315 nm) and the crosslinked products were separated by SDS-PAGE. The results clearly demonstrate crosslinking of the huRPA p70 and p32 subunits with DNA. The p70 subunit appears to bind to the single-stranded part of the DNA duplex, the p32 subunit locates near the 3'-end of the primer, while the p14 subunit locates relatively far from the 3'-end of the primer. This approach opens new possibilities for analysis of huRPA loading on DNA in the course of DNA replication and DNA repair.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Azides / chemistry*
  • Azides / metabolism
  • Cross-Linking Reagents*
  • DNA / chemistry
  • DNA Polymerase I / metabolism
  • DNA Polymerase beta / metabolism
  • DNA, Single-Stranded / chemistry
  • DNA-Binding Proteins / chemistry*
  • DNA-Directed DNA Polymerase / metabolism*
  • Escherichia coli / enzymology
  • Humans
  • Molecular Structure
  • Photoaffinity Labels / chemical synthesis
  • Photoaffinity Labels / chemistry*
  • Photochemistry
  • Replication Protein A
  • Templates, Genetic
  • Ultraviolet Rays
  • Uridine Triphosphate / analogs & derivatives*
  • Uridine Triphosphate / chemistry
  • Uridine Triphosphate / metabolism


  • 5-(N-(2-nitro-5-azidobenzoyl)-3-aminopropen-1-yl)deoxyuridine-5'-triphosphate
  • Azides
  • Cross-Linking Reagents
  • DNA, Single-Stranded
  • DNA-Binding Proteins
  • Photoaffinity Labels
  • RPA1 protein, human
  • Replication Protein A
  • DNA
  • DNA Polymerase I
  • DNA Polymerase beta
  • DNA-Directed DNA Polymerase
  • Uridine Triphosphate