Association between the herpes simplex virus-1 DNA polymerase and uracil DNA glycosylase

J Biol Chem. 2010 Sep 3;285(36):27664-72. doi: 10.1074/jbc.M110.131235. Epub 2010 Jul 2.

Abstract

Herpes simplex virus-1 (HSV-1) is a large dsDNA virus that encodes its own DNA replication machinery and other enzymes involved in DNA transactions. We recently reported that the HSV-1 DNA polymerase catalytic subunit (UL30) exhibits apurinic/apyrimidinic and 5'-deoxyribose phosphate lyase activities. Moreover, UL30, in conjunction with the viral uracil DNA glycosylase (UL2), cellular apurinic/apyrimidinic endonuclease, and DNA ligase IIIalpha-XRCC1, performs uracil-initiated base excision repair. Base excision repair is required to maintain genome stability as a means to counter the accumulation of unusual bases and to protect from the loss of DNA bases. Here we show that the HSV-1 UL2 associates with the viral replisome. We identified UL2 as a protein that co-purifies with the DNA polymerase through numerous chromatographic steps, an interaction that was verified by co-immunoprecipitation and direct binding studies. The interaction between UL2 and the DNA polymerase is mediated through the UL30 subunit. Moreover, UL2 co-localizes with UL30 to nuclear viral prereplicative sites. The functional consequence of this interaction is that replication of uracil-containing templates stalls at positions -1 and -2 relative to the template uracil because of the fact that these are converted into non-instructional abasic sites. These findings support the existence of a viral repair complex that may be capable of replication-coupled base excision repair and further highlight the role of DNA repair in the maintenance of the HSV-1 genome.

Publication types

  • Research Support, N.I.H., Extramural

MeSH terms

  • Catalytic Domain
  • DNA Repair
  • DNA Replication
  • DNA, Viral / biosynthesis
  • DNA, Viral / genetics
  • DNA-Directed DNA Polymerase / chemistry
  • DNA-Directed DNA Polymerase / isolation & purification
  • DNA-Directed DNA Polymerase / metabolism*
  • Genome, Viral / genetics
  • Herpesvirus 1, Human / enzymology*
  • Herpesvirus 1, Human / genetics
  • Herpesvirus 1, Human / physiology
  • Multienzyme Complexes / metabolism
  • Protein Binding
  • Protein Transport
  • Uracil-DNA Glycosidase / isolation & purification
  • Uracil-DNA Glycosidase / metabolism*
  • Virus Replication

Substances

  • DNA, Viral
  • Multienzyme Complexes
  • DNA synthesome
  • DNA-Directed DNA Polymerase
  • Uracil-DNA Glycosidase