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July 12, 2000Biochemistry

Determinants of Mg2+-Dependent Activities of Recombinant Human Immunodeficiency Virus Type 1 Integrase

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Authors

HLHervé LehPBPriscille BrodinJBJulien Bischerour

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Overview

In vitro analysis demonstrates that tetrameric self-assembly enables magnesium-dependent activity in recombinant HIV-1 integrase, indicating that quaternary structure is critical for viral function.

Key Points

  • To examine how the oligomeric self-assembly state of recombinant HIV-1 integrase governs its physiologically relevant magnesium-dependent catalytic activity and DNA binding.
  • Compared three recombinant HIV-1 integrase preparations: detergent-purified monomers [IN(CHAPS)], detergent-dialyzed mixtures [IN(dial)], and detergent-free tetramers [IN(zn)].
  • Characterized self-assembly states and evaluated catalytic activity alongside DNA-binding capacity in the presence of magnesium or manganese cofactors.
  • Tetrameric IN(zn) displayed strong magnesium-dependent catalytic activity, whereas monomeric IN(CHAPS) was completely inactive with magnesium, and IN(dial) showed intermediate activity.
  • All three integrase preparations exhibited comparable manganese-dependent catalytic activity, showing that manganese-driven catalysis does not depend on higher-order oligomerization.
  • Tetrameric integrase bound target DNA efficiently with either magnesium or manganese, whereas monomeric integrase strictly required manganese for DNA binding.

Cite This Study

Leh et al. (2000) studied this question.

synapsesocial.com/papers/6a835f67dfd29b4838caa201https://doi.org/10.1021/bi000398b
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