Cited by 77HIV/AIDS drug development and treatmentHIV Research and TreatmentT-cell and Retrovirus Studies

Ribonuclease H: properties, substrate specificity and roles in retroviral reverse transcription

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Champoux, James J., Schultz, Sharon J.·2009·The FEBS Journal

Abstract

Retroviral reverse transcriptases possess both a DNA polymerase and an RNase H activity. The linkage with the DNA polymerase activity endows the retroviral RNases H with unique properties not found in the cellular counterparts. In addition to the typical endonuclease activity on a DNA/RNA hybrid, cleavage by the retroviral enzymes is also directed by both DNA 3′ recessed and RNA 5′ recessed ends, and by certain nucleotide sequence preferences in the vicinity of the cleavage site. This spectrum of specificities enables retroviral RNases H to carry out a series of cleavage reactions during reverse transcription that degrade the viral RNA genome after minus‐strand synthesis, precisely generate the primer for the initiation of plus strands, facilitate the initiation of plus‐strand synthesis and remove both plus‐ and minus‐strand primers after they have been extended.

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Crossref · 10.1111/j.1742-4658.2009.06909.x

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  • The polymerase-dependent ribonuclease H cleavage mode occurs during pauses in DNA synthesis and leaves nicks in the RNA as reverse transcriptase slides along it.

    “This mode is polymerase-dependent and occurs during pauses in DNA synthesis, leaving nicks in the RNA as RT slides along it [27,28].”

    From Retroviral RNase H: structure, mechanism, and inhibition (2021) · cites this paper as [28]

    The DNA 3′ end-directed cleavage section reports RNase H cleavage at pause sites during polymerization, and STEP 1 says this mode cleaves the RNA concomitantly with DNA synthesis, presumably at pause sites. These passages support intermittent RNA cleavage, but the paper hedges the timing and does not describe RT sliding along the RNA. (LLM, conf=0.86)

    Experimental — accuracy not yet measured
  • 5'-end RNA-directed cleavage is determined by the position of 5'-recessed RNA in the DNA polymerase active site and removes longer RNA fragments still base-paired to the minus DNA.

    “The 5'-end RNA-directed cleavage is determined by the position of the 5’-recessed RNA (from nicks) in the DNA polymerase active site and removes longer RNA fragments that remain base-paired to the minus DNA [26-28,52-54].”

    From Retroviral RNase H: structure, mechanism, and inhibition (2021) · cites this paper as [28]

    The “RNA 5' end-directed cleavage” section says reverse transcriptase binds a hybrid with a recessed RNA 5' end and cleaves the RNA about 13–19 nucleotides from that end; it proposes an interaction near the polymerase active site. But the same section explicitly says an RNA 5' end at a nick is not recognized for this cleavage mode by HIV-1 and M-MLV RNases H; a 2–3-nucleotide upstream gap permits it. The cited passages do not establish that this mode removes the longer fragments remaining paired to minus DNA. (LLM, conf=0.87)

    Experimental — accuracy not yet measured
  • RNase H enzymes are found across all three domains of life and in retroviruses such as HIV.

    “RNase H enzymes are found across all three domains of life, and they are present in other systems, including retroviruses (i.e. HIV)”

    From Ribonucleotide errors, RNase HII, and ribonucleotide excision repair (2026) · cites this paper as Champoux and Schultz 2009

    The Introduction identifies HIV-1 as a focus of the review, and Structure-function considerations discusses RNases H from bacteria and humans. These passages support the retroviral, bacterial, and eukaryotic examples, but the paper does not establish their presence across all three domains of life; the archaeal domain is not addressed. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • The two-metal-binding mechanism has been widely accepted based on structural and functional experiments.

    “Based on these structural and functional experiments, the two metal-binding mechanism has been widely accepted [27,28,30,31,63,64].”

    From Retroviral RNase H: structure, mechanism, and inhibition (2021) · cites this paper as [28]

    Experimental — accuracy not yet measured
  • Retroviral reverse transcriptases have three modes of RNA hydrolysis by ribonuclease H: 3'-end DNA-directed cleavage, 5'-end RNA-directed cleavage, and non-directed or internal cleavage.

    “Retroviral RTs, including HIV-1 RT and avian myeloblastosis virus (AMV) RT, which function as heterodimers, as well as M-MLV RT, which functions as a monomer, have three modes of RNA hydrolysis by RNH: 3'-end DNA directed cleavage, 5'-end RNA directed cleavage, and non-directed or internal cleavage [26-28,31,52-54].”

    From Retroviral RNase H: structure, mechanism, and inhibition (2021) · cites this paper as [28]

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Research works printed but not linked: 2

  1. [5]Telesnitsky A Goff SP Skalka AM Goff SP Reverse Transcriptase 1993 Plainview, New York Cold Spring Harbor Laboratory Press 49 83
  2. [80]Telesnitsky A Goff SP Coffin JM Hughes SH Varmus HE Retroviruses 1997 Plainview, NY Cold Spring Harbor Laboratory Press 121 160 21433342

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Authors
Champoux, J. J., & Schultz, S. J.
Affiliations
University of Washington (US)
Venue
The FEBS Journal
Publisher
Wiley
Published
2009-02-25
Volume
276
Issue
6
Pages
1506-1516
ISSN
  • 1742-464X (ISSN-L)
  • 1742-4658
OpenAlex
W1610099020
Cited by
77
References
104
Citations by year
2026: 3 · 2024: 1 · 2023: 3 · 2022: 3 · 2021: 5 · 2020: 4 · 2019: 4 · 2018: 8 · 2017: 4 · 2016: 4 · 2015: 5 · 2014: 1 · 2013: 8 · 2012: 9
FWCI
0.93
Type
journal article
Language
en
Open access
Locations
  • FEBS Journal (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Institutes of Health
  • National Cancer Institute (CA51605, R01CA051605, R37CA051605)
Topics
  • Health Sciences › Medicine › Infectious Diseases › HIV/AIDS drug development and treatment
  • Life Sciences › Immunology and Microbiology › Virology › HIV Research and Treatment
  • Life Sciences › Immunology and Microbiology › Immunology › T-cell and Retrovirus Studies
Keywords
RNase H, reverse transcriptase, substrate specificity, primer removal, viral RNA degradation
MeSH terms
Models, Molecular, Protein Conformation, Retroviridae, Structure-Activity Relationship, Substrate Specificity, Transcription, Genetic, Ribonuclease H, Biocatalysis

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