Sammanfattning

Potato mop-top virus (PMTV) produces a defective RNA (D RNA) encompassing the 5'-terminal 479 nucleotides (nt) and 3'-terminal 372 nt of RNA-TGB (where TGB is triple gene block). The mechanism that controls D RNA biogenesis and the role of D RNA in virus accumulation was investigated by introducing deletions, insertions, and point mutations into the sequences of the open reading frames (ORFs) of TGB1 and the 8-kilodalton (8K) protein that were identified as required for efficient production of the D RNA. Transient expression of RNA-TGB in the absence of RNA-Rep (which encodes the replicase) did not result in accumulation of D RNA, indicating that its production is dependent on PMTV replication. The D RNA could be eliminated by disrupting a predicted minus-strand stem-loop structure comprising complementary sequences of the 5' TGB1 ORF and the 3' 8K ORF, suggesting intramolecular template switching during positive-strand synthesis as a mechanism for the D RNA biogenesis. Virus accumulation was reduced when the 8K ORF was disrupted but D RNA was produced. Conversely, the virus accumulated at higher titers when the 8K ORF was intact and D RNA production was blocked. These data demonstrate that the D RNA interferes with virus infection and therefore should be referred to as a defective interfering RNA (DI RNA). The 8K protein was shown to be a weak silencing suppressor. This study provides an example of the interplay between a pathogen and its molecular parasite where virus accumulation was differentially regulated by the 8K protein and DI RNA, indicating that they play antagonistic roles and suggesting a mechanism by which the virus can attenuate replication, decreasing viral load and thereby enhancing its efficiency as a parasite.

Publicerad i

Journal of Virology
2013, Volym: 87, nummer: 11, sidor: 6091-6103
Utgivare: AMER SOC MICROBIOLOGY

SLU författare

• Lukhovitskaya, Nina

  • Institutionen för växtbiologi, Sveriges lantbruksuniversitet
    

• Savenkov, Eugene

  • Institutionen för växtbiologi, Sveriges lantbruksuniversitet
    

UKÄ forskningsämne

Växtbioteknologi
Jordbruksvetenskap
Utvecklingsbiologi


Publikationens identifierare

DOI: https://doi.org/10.1128/JVI.03322-12

Permanent länk till denna sida (URI)

https://res.slu.se/id/publ/52658