A polymerase-site-jumping model for strand transfer during DNA synthesis by reverse transcriptase.

Area of Science:

• Molecular Biology
• Virology
• Biochemistry

Background:

• Reverse transcription involves obligatory strand transfers at viral genome ends.
• Multiple strand transfers also occur within internal regions during viral DNA synthesis.

Purpose of the Study:

• To propose a model for processive DNA synthesis by reverse transcriptase.
• To elucidate the mechanism of inter- and intramolecular strand transfers during minus DNA synthesis.

Main Methods:

• Development of a model for DNA synthesis mediated by reverse transcriptase.
• Analytical studies on strand transfer efficiency and negative interference.
• Investigating the role of polymerase and RNase H rates.

Main Results:

• A two-step mechanism for strand transfer is presented: nascent DNA annealing and polymerase active site jumping.
• The model explains strand transfer promotion by pausing and deletions.
• Analytical studies align theoretical results with experimental data.

Conclusions:

• The proposed model provides a framework for understanding reverse transcriptase-mediated strand transfers.
• The study offers insights into factors influencing replication fidelity and genetic variation in viruses.