Strand transfer events during HIV-1 reverse transcription

Area of Science:

• Molecular Biology
• Virology
• Biochemistry

Background:

• Retroviruses, including HIV-1, replicate via reverse transcription, converting RNA to DNA.
• Reverse transcriptase (RT) possesses DNA polymerase and RNase H activities essential for this process.
• Strand transfer mechanisms are critical for completing reverse transcription and generating double-stranded DNA.

Purpose of the Study:

• To elucidate the mechanisms of strand transfer during retroviral reverse transcription.
• To understand the role of reverse transcriptase and nucleocapsid protein in facilitating strand transfer.
• To explore how strand transfers contribute to viral recombination and genetic diversity.

Main Methods:

• Analysis of reverse transcriptase (RT) activities, including DNA polymerase and RNase H.
• Investigation of the function of viral nucleocapsid protein (NC) in promoting strand exchange.
• Examination of the biochemical features of strand transfer reactions, including one-step and multi-step processes.

Main Results:

• Strand transfer involves RNase H removing RNA segments to allow DNA strand annealing.
• Nucleocapsid protein (NC) facilitates strand exchange, promoting efficient transfer.
• Recombination strand transfers between co-packaged RNA genomes generate viral progeny with diverse genetic structures.

Conclusions:

• Strand transfers are fundamental to retroviral reverse transcription, enabling the synthesis of double-stranded DNA.
• The interplay between RT, RNase H, and NC is vital for efficient strand transfer and viral replication.
• Viral recombination, driven by strand transfers, enhances viral adaptability against host immunity and therapies.