Five isolates of a new member of the family Closteroviridae, tentatively named blackcurrant
leafroll-associated virus 1 (BcLRaV-1), were identified in the currant. The 17-kb-long genome codes for
10 putative proteins. The replication-associated polyprotein has several functional domains, including
papain-like proteases, methyltransferase, Zemlya, helicase, and RNA-dependent RNA polymerase.
Additional open reading frames code for a small protein predicted to integrate into the host cell wall,
a heat-shock protein 70 homolog, a heat-shock protein 90 homolog, two coat proteins, and three proteins
of unknown functions. Phylogenetic analysis showed that BcLRaV-1 is related to members of the genus
Closterovirus, whereas recombination analysis provided evidence of intraspecies recombination.