Cited by 90Chromosomal and Genetic VariationsRNA and protein synthesis mechanismsT-cell and Retrovirus Studies

Unusual priming mechanism of RNA-directed DNA synthesis in copia retrovirus-like particles of Drosophila

Kikuchi, Yo, Ando, Yumiko, Shiba, Tadayoshi·1986·Nature

Abstract

Drosophila cells contain virus-like particles (VLPs) containing 5 kilobases (kb) of RNA (VLP H-RNA) homologous to the transposable element copia. The identity between VLP H-RNA and copia DNA has previously been confirmed at the nucleotide sequence level and reverse transcriptase activity is also detected in the VLPs. These results suggest that VLPs and copia are derivatives of viral particle and provirus forms, respectively, of the copia retrovirus-like particle. If the copia retrovirus-like particle replicates by a mechanism similar to the mechanism of vertebrate retroviral replication, a cellular transfer RNA would prime synthesis of the first DNA strand. We show that this is indeed so but that copia retrovirus-like particle has a novel type of priming mechanism; the first DNA extension does not start from the 3' end of a tRNA, but from an internal site (two nucleotides after the anticodon loop) of the Drosophila initiator methionine tRNA (tRNAMeti).

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Crossref · 10.1038/323824a0

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22 of 22 references verified0 citation errors · 0 not checkable

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  • Some retrotransposons require a tRNA molecule to initiate reverse transcription.

    “Some retrotransposons also require a tRNA molecule to initiate reverse transcription (12)(13)(14).”
  • tRNA i Met-primed reverse transcription is conserved among many LTR retrotransposons, including copia from Drosophila melanogaster, Tp1 and Tp2 from Physarum polycephalum, and Saccharomyces cerevisiae Ty5.

    “tRNA i Met -primed reverse transcription is conserved among many LTR retrotransposons, including the copia retrovirus-like particle from Drosophila melanogaster (12), Tp1 and Tp2 from the slime mold Physarum polycephalum (13), and Saccharomyces cerevisiae Ty5 (14).”
  • In copia from D. melanogaster and Ty5 from S. cerevisiae, reverse transcription initiation requires a processed 5' fragment of tRNA i Met.

    “In contrast, copia from D. melanogaster and Ty5 from S. cerevisiae, reverse transcription initiation requires a processed 5Ј fragment of tRNA i Met (12,14).”
  • LysRS and IleRS are packaged in HIV-1 virions.

    “| Packaged in HIV-1 virion | LysRS a , IleRS a | 12, 128 |”

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Authors
Kikuchi, Y., Ando, Y., & Shiba, T.
Affiliations
Kitasato University (JP)
Venue
Nature
Published
1986-10-30
Volume
323
Issue
6091
Pages
824-826
ISSN
  • 0028-0836 (ISSN-L)
  • 1476-4687
OpenAlex
W2060825841
Cited by
90
References
22
Citations by year
2026: 1 · 2024: 1 · 2023: 1 · 2020: 1 · 2019: 1 · 2018: 2 · 2014: 1 · 2013: 1 · 2012: 1
FWCI
5.50
Type
journal article
Language
en
Open access
closed
Locations
  • Nature (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Agricultural and Biological Sciences › Plant Science › Chromosomal and Genetic Variations
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA and protein synthesis mechanisms
  • Life Sciences › Immunology and Microbiology › Immunology › T-cell and Retrovirus Studies
Keywords
RNA-directed DNA synthesis, reverse transcription, tRNA primer, transposable elements, provirus, viral replication, Drosophila
MeSH terms
Animals, Base Sequence, DNA Replication, Drosophila, Nucleic Acid Conformation, Repetitive Sequences, Nucleic Acid, Retroviridae, RNA, Virion

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