Expression of an Mg2+-dependent HIV-1 RNase H construct for drug screening

Richard V. Farias, Deborah A. Vargas, Andres E. Castillo, Beatriz Valenzuela, Marie L. Coté, Monica J. Roth, Oscar Leon

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5 Scopus citations


A single polypeptide of the HIV-1 reverse transcriptase that reconstituted Mg2+-dependent RNase H activity has been made. Using molecular modeling, the construct was designed to encode the p51 subunit joined by a linker to the thumb (T), connection (C), and RNase H (R) domains of p66. This p51-G-TCR construct was purified from the soluble fraction of an Escherichia coli strain, MIC2067(DE3), lacking endogenous RNase HI and HII. The p51-G-TCR RNase H construct displayed Mg2+-dependent activity using a fluorescent nonspecific assay and showed the same cleavage pattern as HIV-1 reverse transcriptase (RT) on substrates that mimic the tRNA removal required for second-strand transfer reactions. The mutant E706Q (E478Q in RT) was purified under similar conditions and was not active. The RNase H of the p51-G-TCR RNase H construct and wild type HIV-1 RT had similar Kms for an RNA-DNA hybrid substrate and showed similar inhibition kinetics to two known inhibitors of the HIV-1 RT RNase H.

Original languageEnglish (US)
Pages (from-to)4735-4741
Number of pages7
JournalAntimicrobial agents and chemotherapy
Issue number10
StatePublished - Oct 2011

All Science Journal Classification (ASJC) codes

  • Pharmacology
  • Pharmacology (medical)
  • Infectious Diseases


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