Abstract
Reverse transcriptases (RTs) catalyze the multi-step process that converts the single-stranded viral RNA genome to double-stranded integration-competent DNA, a process that is essential for the proliferation of retroviruses and retrotransposons. The former are released from cells as infectious particles and include human immunodeficiency virus (HIV) and hepadnaviruses such as hepatitis B virus (HBV). In contrast, retrotransposons are restricted to intracellular proliferation cycle and are very common in eukaryotic genomes. The N-terminal DNA polymerase domain of RTs structurally resembles other nucleic acid polymerases and assumes the topology of a right hand, with subdomains designated fingers, palm, and thumb. RTs exhibit low fidelity and processivity and are capable of both intra- and intermolecular strand displacement synthesis. A distinguishing feature of RTs is the presence of a C-terminal ribonuclease H (RNase H) domain in enzymes from viruses and long terminal repeat (LTR)-containing retrotransposons. The general role of this domain is sequence-independent removal of RNA from the RNA/DNA hybrid intermediates of reverse transcription, although precise cleavage is also required to mediate key steps such as (+) strand primer selection and DNA strand transfer. In LTR retroelements the RNase H domain is located immediately following the thumb subdomain, while in retroviruses an RNase H-like “connection domain” devoid of catalytic activity is followed by the catalytically competent C-terminal RNase H domain. DNA polymerase and RNase H activities are coordinated, but RNA/DNA hybrid hydrolysis is significantly slower than nucleotide incorporation. Whether this reflects simultaneous or individual active site occupancy of the nucleic acid substrate remains controversial.
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Grice, S.F.J.L., Nowotny, M. (2014). Reverse Transcriptases. In: Murakami, K., Trakselis, M. (eds) Nucleic Acid Polymerases. Nucleic Acids and Molecular Biology, vol 30. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-39796-7_8
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