Purification and partial characterization of equine infectious anemia virus reverse transcriptase

Virology. 1991 Nov;185(1):387-94. doi: 10.1016/0042-6822(91)90786-b.


Previously we raised a rabbit monospecific antibody (C2003) against a synthetic peptide derived from a sequence within the C-terminal portion of the reverse transcriptase (RT) of the human immunodeficiency virus type 1 (HIV-1). This sequence is found to be conserved in the predicted amino acid sequence of a related lentivirus, the equine infectious anemia virus (EIAV). It was previously determined that the C2003 antibody could cross-react with native EIAV RT and directly inhibit the DNA polymerase activity of the enzyme. We have now fractionated EIAV RT by immunoaffinity chromatography with immobilized C2003 antibody. The procedure yielded an equimolar mixture of two proteins of 66 and 51 kDa associated with both DNA polymerase and RNase H activities. When the EIAV RT proteins were examined by in situ activity gel assays, polymerase activity was found to be principally associated with the 66-kDa component. The fidelity of DNA synthesis by EIAV RT was found to be equivalent to that of HIV-1 RT and lower than that of AMV RT. These observations indicate that the RTs of EIAV and HIV-1 share similar structural and functional properties.

Publication types

  • Comparative Study
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Amino Acid Sequence
  • Animals
  • Base Sequence
  • Cells, Cultured
  • Chromatography, Affinity
  • DNA Replication*
  • Fibroblasts
  • Genes, pol
  • HIV-1 / enzymology
  • HIV-1 / genetics
  • Horses
  • Infectious Anemia Virus, Equine / enzymology*
  • Infectious Anemia Virus, Equine / genetics
  • Kinetics
  • Molecular Sequence Data
  • RNA-Directed DNA Polymerase / genetics
  • RNA-Directed DNA Polymerase / isolation & purification*
  • RNA-Directed DNA Polymerase / metabolism
  • Ribonuclease H / isolation & purification
  • Ribonuclease H / metabolism
  • Sequence Homology, Nucleic Acid


  • RNA-Directed DNA Polymerase
  • Ribonuclease H