Peptidase S39B, luteovirus (IPR000382)

Short name: Peptidase_S39B_luteovirus

Overlapping homologous superfamilies


Domain relationships



ORF2 of Potato leafroll virus (PLrV) encodes a polyprotein which is translated following a -1 frameshift. The polyprotein has a putative linear arrangement of membrane achor-VPg-peptidase-polmerase domains. The serine peptidase domain which is found in this group of sequences belongs to MEROPS peptidase family S39 (clan PA(S)). It is likely that the peptidase domain is involved in the cleavage of the polyprotein [PMID: 9714253].

The nucleotide sequence for the RNA of PLrV has been determined [PMID: 2732710, PMID: 2466700]. The sequence contains six large open reading frames (ORFs). The 5' coding region encodes two polypeptides of 28K and 70K, which overlap in different reading frames; it is suggested that the third ORF in the 5' block is translated by frameshift readthrough near the end of the 70K protein, yielding a 118K polypeptide [PMID: 2732710]. Segments of the predicted amino acid sequences of these ORFs resemble those of known viral RNA polymerases, ATP-binding proteins and viral genome-linked proteins. The nucleotide sequence of the genomic RNA of Beet western yellows virus (BWYV) has been determined [PMID: 3194229]. The sequence contains six long ORFs. A cluster of three of these ORFs, including the coat protein cistron, display extensive amino acid sequence similarity to corresponding ORFs of a second luteovirus: Barley yellow dwarf virus [PMID: 3194229].

GO terms

Biological Process

GO:0016032 viral process

Molecular Function

GO:0004252 serine-type endopeptidase activity

Cellular Component

GO:0016021 integral component of membrane

Contributing signatures

Signatures from InterPro member databases are used to construct an entry.