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).



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.


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.



  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

P4_GLRV3 Protein P4 (4 kDa protein)
MVP1_GLRV3 Movement protein Hsp70h (Heat shock protein 70 homolog) (Hsp70h)
P20A_GLRV3 Protein P20A (19.6 kDa protein)
P55_GLRV3 Protein P55
P6_GLRV3 Uncharacterized 6 kDa protein (p6)
R1AB_GLRV3 Replicase polyprotein 1ab [Cleaved into: Leader protease (L-Pro) (EC 3.4.22.-) (Papain-like cysteine ...
P7_GLRV3 Protein P7 (7 kDa protein)
R1A_GLRV3 Replicase protein 1a [Cleaved into: Leader protease (L-Pro) (EC 3.4.22.-) (Papain-like cysteine ...
P21_GLRV3 Protein P21 (21 kDa protein)
P20B_GLRV3 Protein P20B (19.7 kDa protein)
CAPSD_GLRV3 Capsid protein (CP) (Coat protein)
CPM_GLRV3 Minor capsid protein (CPm)
MVP2_GLRV3 Movement protein p5 (5 kDa protein) (Protein P5)