Click Chemistry-Based Two-Component System for Efficient Inhibition of Human Immunodeficiency Virus (HIV) Reverse...

Area of Science:

• Biochemistry
• Molecular Biology
• Medicinal Chemistry

Background:

• DNA polymerases are crucial enzymes involved in DNA replication and repair.
• Developing targeted inhibitors for enzymes like human immunodeficiency virus (HIV) reverse transcriptase (RT) is vital for antiviral therapies.
• Copper-free click chemistry offers a versatile tool for molecular synthesis and bioconjugation.

Purpose of the Study:

• To synthesize and evaluate novel deoxythymidine triphosphate (dTTP) analogues for copper-free click chemistry.
• To investigate the inhibitory effects of these dTTP analogues on the activity of DNA polymerases, particularly HIV RT.
• To explore the potential of these analogues as a new class of in vivo inhibitors.

Main Methods:

• Synthesis of two specific dTTP analogues designed for copper-free click chemistry.
• In vitro assays to measure the activity of DNA polymerases in the presence of the synthesized analogues.
• Comparative analysis of the inhibitory effects against HIV RT compared to conventional inhibitors like azidothymidine.

Main Results:

• The synthesized dTTP analogues were successfully incorporated into DNA via click chemistry in polymerase active sites.
• Both analogues together suppressed human immunodeficiency virus (HIV) reverse transcriptase (RT) activity by up to 93%.
• The observed inhibition was not overcome by excess primer-template, distinguishing it from azidothymidine's mechanism.

Conclusions:

• Novel dTTP analogues enable copper-free click chemistry within DNA polymerase active sites.
• These analogues demonstrate potent and distinct inhibition of HIV RT activity.
• The findings suggest a promising new avenue for developing effective in vivo inhibitors of HIV RT and other DNA polymerases.