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J. Virol., Mar 1995, 1951-1954, Vol 69, No. 3
Copyright © 1995, American Society for Microbiology

Capped nonviral sequences at the 5' end of the mRNAs of rice hoja blanca virus RNA4

BC Ramirez, D Garcin, LA Calvert, D Kolakofsky and AL Haenni
Institut Jacques Monod, Paris, France.

Subgenomic RNAs of both polarities corresponding to rice hoja blanca virus (RHBV) ambisense RNA4 were detected in RHBV-infected rice tissues. Total RNA extracted from RHBV-infected and noninfected rice tissues and RNA4 purified from RHBV ribonucleoprotein particles were used as templates for primer extension studies. The RNAs extracted from RHBV-infected tissues contain a population of RNA molecules with 10 to 17 nonviral nucleotides at their 5' end. The RNA-cDNA hybrids resulting from primer extension of such RNA molecules were specifically immunoselected with anti-cap antibodies, indicating that the subgenomic RNAs are capped and probably serve as mRNAs and that the additional nucleotides at their 5' end possibly derive from host mRNAs via a cap- snatching mechanism.


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