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The yeast Ty3 retrotransposon contains a 5′–3′ bipartite primer‐binding site and encodes nucleocapsid protein NCp9 functionally homologous to HIV‐1 NCp7
Author(s) -
Gabus Caroline,
Ficheux Damien,
Rau Michael,
Keith Gérard,
Sandmeyer Suzanne,
Darlix JeanLuc
Publication year - 1998
Publication title -
the embo journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 7.484
H-Index - 392
eISSN - 1460-2075
pISSN - 0261-4189
DOI - 10.1093/emboj/17.16.4873
Subject(s) - retrotransposon , biology , primer (cosmetics) , genetics , primer binding site , homologous chromosome , human immunodeficiency virus (hiv) , yeast , long terminal repeat , reverse transcriptase , genome , virology , gene , transposable element , polymerase chain reaction , chemistry , organic chemistry
Retroviruses, including HIV‐1 and the distantly related yeast retroelement Ty3, all encode a nucleoprotein required for virion structure and replication. During an in vitro comparison of HIV‐1 and Ty3 nucleoprotein function in RNA dimerization and cDNA synthesis, we discovered a bipartite primer‐binding site (PBS) for Ty3 composed of sequences located at opposite ends of the genome. Ty3 cDNA synthesis requires the 3′ PBS for primer tRNA i Met annealing to the genomic RNA, and the 5′ PBS, in cis or in trans , as the reverse transcription start site. Ty3 RNA alone is unable to dimerize, but formation of dimeric tRNA i Met bound to the PBS was found to direct dimerization of Ty3 RNA–tRNA i Met . Interestingly, HIV‐1 nucleocapsid protein NCp7 and Ty3 NCp9 were interchangeable using HIV‐1 and Ty3 RNA template–primer systems. Our findings impact on the understanding of non‐canonical reverse transcription as well as on the use of Ty3 systems to screen for anti‐NCp7 drugs.