Improved NYVAC-based vaccine vectors

PLoS One. 2011;6(11):e25674. doi: 10.1371/journal.pone.0025674. Epub 2011 Nov 9.


While as yet there is no vaccine against HIV/AIDS, the results of the phase III Thai trial (RV144) have been encouraging and suggest that further improvements of the prime/boost vaccine combination of a poxvirus and protein are needed. With this aim, in this investigation we have generated derivatives of the candidate vaccinia virus vaccine vector NYVAC with potentially improved functions. This has been achieved by the re-incorporation into the virus genome of two host range genes, K1L and C7L, in conjunction with the removal of the immunomodulatory viral molecule B19, an antagonist of type I interferon action. These novel virus vectors, referred to as NYVAC-C-KC and NYVAC-C-KC-ΔB19R, have acquired relevant biological characteristics, giving higher levels of antigen expression in infected cells, replication-competency in human keratinocytes and dermal fibroblasts, activation of selective host cell signal transduction pathways, and limited virus spread in tissues. Importantly, these replication-competent viruses have been demonstrated to maintain a highly attenuated phenotype.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Apoptosis / genetics
  • Apoptosis / physiology
  • Cell Cycle / genetics
  • Cell Cycle / physiology
  • Cells, Cultured
  • Female
  • Genetic Vectors / genetics*
  • HIV Envelope Protein gp120 / genetics
  • Humans
  • Mice
  • Mice, Inbred BALB C
  • Polymerase Chain Reaction
  • Pregnancy
  • Signal Transduction / genetics
  • Viral Proteins / genetics
  • Viral Vaccines / genetics*
  • Viral Vaccines / immunology*
  • Virus Replication / genetics
  • Virus Replication / physiology


  • HIV Envelope Protein gp120
  • NYVAC vaccine
  • Viral Proteins
  • Viral Vaccines
  • gp120 protein, Human immunodeficiency virus 1