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Related Experiment Videos

Human endogenous retrovirus K10 encodes a functional integrase

Y Kitamura1, T Ayukawa, T Ishikawa

  • 1Division of Molecular Genetics, National Institute of Health, Tokyo, Japan.

Journal of Virology
|May 1, 1996
PubMed
Summary

Human endogenous retrovirus K1O encodes a functional integrase enzyme. This integrase enzyme exhibits broad activity across different viral long terminal repeat (LTR) substrates, unlike other retroviral integrases.

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Area of Science:

  • Molecular Biology
  • Virology
  • Biochemistry

Background:

  • Human endogenous retroviruses (HERVs) are remnants of ancient retroviral infections in the human genome.
  • Retroviral integrase enzymes are crucial for viral replication, mediating the insertion of viral DNA into the host genome.
  • Understanding the function and specificity of HERV integrases can provide insights into viral evolution and potential therapeutic targets.

Purpose of the Study:

  • To clone and express a functional integrase enzyme from human endogenous retrovirus K1O (HERV-K1O).
  • To characterize the enzymatic activity and substrate specificity of the HERV-K1O integrase in vitro.
  • To compare the substrate specificity of HERV-K1O integrase with that of other known retroviral integrases.

Main Methods:

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  • Cloning of a DNA fragment encoding HERV-K1O integrase.
  • Expression of the integrase as a fusion protein with Escherichia coli maltose-binding protein.
  • In vitro enzymatic assays using double-stranded oligonucleotide substrates mimicking viral long terminal repeats (LTRs).
  • Testing activity on HERV-K1O, Rous sarcoma virus (RSV), and human immunodeficiency virus type 1 (HIV-1) LTR substrates.

    • Main Results:

    • The HERV-K1O integrase fusion protein demonstrated high activity in terminal cleavage and strand transfer on the HERV-K1O LTR substrate in the presence of Mn2+.
    • The HERV-K1O integrase exhibited activity on both Rous sarcoma virus and human immunodeficiency virus type 1 LTR substrates.
    • In contrast, Rous sarcoma virus and human immunodeficiency virus type 1 integrases showed activity only on their respective LTR substrates.

    Conclusions:

    • HERV-K1O encodes a functional integrase enzyme.
    • The HERV-K1O integrase possesses a relaxed substrate specificity, acting on LTRs from different retroviruses.
    • This finding has implications for understanding the evolutionary role of HERVs and the potential for cross-reactivity of retroviral enzymes.