Quaranjavirus

VIRION

Enveloped, spherical. The virions are 80-120 nm in diameter

GENOME

segmented ssRNA(-) linear genome, encapsidated by nucleoprotein (NP) Contains 6 segments coding for 6 proteins. Segments size range from 0.9 to 2.3 kb. Genome total size is about 10 Kb

GENE EXPRESSION

Viral RNA polymerase (PB1, PB2 and PA) transcribes one mRNA from each genome segment. Transcription is primed by cap snatching. mRNA are polyadenylated by the viral polymerase stuttering on a poly U track. Segment 6 mRNA can be alternatively spliced, giving rise to mRNA coding for M1 proteins.

REPLICATION

NUCLEUS

  1. Virus attaches to sialic acid receptor though GP protein and is endocytosed by clathrins in the host cell.
  2. endosome acidification induces fusion of virus membrane with the vesicle membrane; encapsidated RNA segments migrate to the nucleus.
  3. Transcription of genomic segments by the viral polymerase produces mRNAs that are capped and polyadenylated by the viral polymerase.
  4. Replication of genomic segments.
  5. High level of M1 protein induces genomes segments export from nucleus by NEP protein.
  6. Virus assembly and budding occurs at the plasma membrane.

Matching UniProtKB/Swiss-Prot entries

6 entries grouped by strain (browse by keywords)

6 entries

Quaranfil virus (isolate QrfV/Tick/Afghanistan/EG_T_377/1968) (QRFV)

Select_allDeselect_all
RDRP_QRFVE RNA-directed RNA polymerase catalytic subunit (EC 2.7.7.48)
NCAP_QRFVE Nucleoprotein (Nucleocapsid protein) (Protein N)
PB2_QRFVE Polymerase basic protein 2 (PB2)
PA_QRFVE Polymerase acidic protein (PA)
M1_QRFVE Probable matrix protein
ENV_QRFVE Envelope glycoprotein