Establishment of papillomavirus infection is enhanced by promyelocytic leukemia protein (PML) expression

Proc Natl Acad Sci U S A. 2004 Sep 28;101(39):14252-7. doi: 10.1073/pnas.0404229101. Epub 2004 Sep 21.

Abstract

Previous studies have suggested that most papillomaviruses enter the host cell via clathrin-dependent receptor-mediated endocytosis but have not addressed later steps in viral entry. To examine these events, we followed the localization of L2 and packaged DNA after entry of infectious virions or L1/L2 pseudovirions. Confocal microscopic analyses of HeLa cells showed a time-dependent uncoating of capsids in cytoplasmic vesicles and the accumulation of both L2 and viral DNA at distinct nuclear domains identified as nuclear domain 10 (ND10). Both L2 and the pseudogenome had a punctate distribution and localized to ND10 in promyelocytic leukemia protein (PML)-expressing cells, whereas L2 had a diffuse nuclear distribution in PML-/- cells. The number of pseudovirus-infected cells was an order of magnitude higher in the PML+ cells compared with the PML-/- cells, and viral genome transcription after infection with authentic bovine papillomavirus virions was similarly elevated in PML+ cells. The results identify a role for PML in the enhancement of viral infectivity in the early part of the life cycle. We propose a model in which L2 chaperones the viral genome to ND10 to efficiently initiate viral transcription.

MeSH terms

  • Animals
  • Bovine papillomavirus 1 / growth & development
  • Bovine papillomavirus 1 / pathogenicity
  • Bovine papillomavirus 1 / physiology*
  • Capsid Proteins / genetics
  • Capsid Proteins / metabolism
  • Cattle
  • Cell Nucleus / metabolism
  • Cell Nucleus / virology
  • DNA, Viral / genetics
  • DNA, Viral / metabolism
  • Gene Expression
  • HeLa Cells
  • Humans
  • Mice
  • Microscopy, Confocal
  • Neoplasm Proteins / biosynthesis*
  • Neoplasm Proteins / genetics
  • Neoplasm Proteins / metabolism
  • Nuclear Proteins / biosynthesis*
  • Nuclear Proteins / genetics
  • Nuclear Proteins / metabolism
  • Papillomavirus Infections / metabolism*
  • Promyelocytic Leukemia Protein
  • Pseudogenes / physiology
  • Recombinant Fusion Proteins / genetics
  • Recombinant Fusion Proteins / metabolism
  • Transcription Factors / biosynthesis*
  • Transcription Factors / genetics
  • Transcription Factors / metabolism
  • Transduction, Genetic
  • Tumor Suppressor Proteins
  • Zinc Fingers

Substances

  • Capsid Proteins
  • DNA, Viral
  • L2 protein, Bovine papillomavirus
  • Neoplasm Proteins
  • Nuclear Proteins
  • Pml protein, mouse
  • Promyelocytic Leukemia Protein
  • Recombinant Fusion Proteins
  • Transcription Factors
  • Tumor Suppressor Proteins
  • PML protein, human