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Related Experiment Videos

High-affinity interaction of human immunodeficiency virus type-1 reverse transcriptase with partially complementary

O D Zakharova1, L Tarrago-Litvak, G Maksakova

  • 1Novosibirsk Institute of Bioorganic Chemistry, Siberian Division of the Russian Academy of Sciences, Russia.

European Journal of Biochemistry
|November 1, 1995
PubMed
Summary

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Human immunodeficiency virus type-1 (HIV-1) reverse transcriptase shows less discrimination against mismatched primers compared to other polymerases. It interacts with the 5

Area of Science:

  • Molecular Biology
  • Virology
  • Enzymology

Background:

  • Human immunodeficiency virus type-1 (HIV-1) reverse transcriptase is a key enzyme in viral replication.
  • Understanding primer-template interactions is crucial for studying reverse transcription.
  • HIV-1 reverse transcriptase exhibits unique substrate specificities compared to other polymerases.

Purpose of the Study:

  • To compare the kinetic parameters (Km and Vmax) of HIV-1 reverse transcriptase with various primer types.
  • To investigate the enzyme's discrimination efficiency between matched and mismatched primers.
  • To explore potential alternative binding sites for primers and tRNA on HIV-1 reverse transcriptase.

Main Methods:

  • Enzymatic assays measuring polymerization kinetics (Km and Vmax) with different oligonucleotide primers.

Related Experiment Videos

  • Analysis of primer extension efficiency based on complementarity to a template.
  • Crosslinking experiments using a platinum derivative to identify enzyme-tRNA interactions.

    • Main Results:

    • HIV-1 reverse transcriptase did not elongate non-complementary primers unless they had a complementary residue or abasic unit at the 3' end.
    • Discrimination against mismatched primers was most effective when mismatches were at the second or third position from the 3' end.
    • Discrimination efficiency was 1-1.5 orders of magnitude lower than in other DNA polymerases and avian myeloblastosis virus reverse transcriptase.
    • Specific oligonucleotide structures showed higher affinity, suggesting additional enzyme contacts with the 5'-end region of non-complementary primers.
    • The p66 subunit of HIV-1 reverse transcriptase can crosslink to the 5' end of tRNA(3Lys), indicating an additional interaction site.

    Conclusions:

    • HIV-1 reverse transcriptase exhibits weaker discrimination against mismatched primers compared to other polymerases.
    • The enzyme may form additional contacts with the 5'-end of non-complementary primers.
    • Beyond the canonical 3'-end binding site, the 5' end of the natural primer tRNA(3Lys) interacts with a specific site on HIV-1 reverse transcriptase.