Ampelovirus

VIRION

Non-enveloped, flexuous and exceptionally long, filamentous particles about 1400-2200 nm in length and 10-13 nm in diameter. The virion body is assembled by the major capsid protein (CP) and the tail by the minor capsid protein (CPm).

GENOME

Linear, ssRNA(+) genome of 16.9 to 17.9 kb. 3’ terminus has no poly(A) tract and the 5’ terminus probably has a methylated nucleotide cap. Encodes 13 proteins.

GENE EXPRESSION

The virion RNA is infectious and serves as both the genome and viral messenger RNA. ORF1a and ORF1ab protein (containing RdRp) are produced by ribosomal frameshifting. Other ORFs are translated from a set of nested 3’ co-terminal subgenomic RNAs.

REPLICATION

CYTOPLASMIC

  1. Virus penetrates into the host cell.
  2. Uncoating, and release of the viral genomic RNA into the cytoplasm.
  3. The viral RNA is translated into a processed ORF1 polyprotein to yield the replication proteins.
  4. Replication occurs in viral factories. A dsRNA genome is synthesized from the genomic ssRNA(+).
  5. The dsRNA genome is transcribed/replicated thereby providing viral mRNAs/new ssRNA(+) genomes.
  6. Subgenomic RNA translation gives rise to the other viral proteins.
  7. Assembly of new virus particles.
  8. Viral movement proteins mediate virion cell-to-cell transfer.

Matching UniProtKB/Swiss-Prot entries

13 entries grouped by strain (browse by keywords)

13 entries

Grapevine leafroll-associated virus 3 (isolate United States/NY1) (GLRaV-3) (Grapevine leafroll-associated closterovirus (isolate 109)) reference strain

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CAPSD_GLRV3Capsid protein (CP) (Coat protein)
CPM_GLRV3Minor capsid protein (CPm)
MVP1_GLRV3Movement protein Hsp70h (Heat shock protein 70 homolog) (Hsp70h)
MVP2_GLRV3Movement protein p5 (5 kDa protein) (Protein P5)
P20A_GLRV3Protein P20A (19.6 kDa protein)
P20B_GLRV3Protein P20B (19.7 kDa protein)
P21_GLRV3Protein P21 (21 kDa protein)
P4_GLRV3Protein P4 (4 kDa protein)
P55_GLRV3Protein P55
P6_GLRV3Uncharacterized 6 kDa protein (p6)
P7_GLRV3Protein P7 (7 kDa protein)
R1AB_GLRV3Replicase polyprotein 1ab
R1A_GLRV3Replicase protein 1a