1887

Abstract

The genome of pineapple mealybug wilt-associated closterovirus-2 (PMWaV-2) was cloned from double-stranded RNA isolated from diseased pineapple and its sequence determined. The 3′-terminal 14861 nt of the single-stranded RNA genome contains ten open reading frames (ORFs) which, from 5′ to 3′, potentially encode a >204 kDa polyprotein containing papain-like protease, methyltransferase and helicase domains (ORF1a), a 65 kDa RNA-dependent RNA polymerase (ORF1b), a 5 kDa hydrophobic protein (ORF2), a 59 kDa heat shock protein 70 homologue (ORF3), a 46 kDa protein (ORF4), a 34 kDa coat protein (ORF5), a 56 kDa diverged coat protein (ORF6), a 20 kDa protein (ORF7), a 22 kDa protein (ORF8) and a 6 kDa protein (ORF9). A 132 nt untranslated region was present at the 3′ terminus of the genome. This genome organization is typical of the monopartite closteroviruses, including the putative +1 ribosomal frameshift allowing expression of ORF1b. Phylogenetic analysis revealed that within the family the mealybug-transmitted PMWaV-2 is more closely related to other mealybug-transmitted members than to those which are transmitted by aphids or whiteflies. Within this group, PMWaV-2 shares the greatest sequence identity with grapevine leafroll-associated virus-3, another mealybug-transmitted closterovirus.

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2001-01-01
2021-02-25
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