The rice tungro spherical waikavirus polyprotein is cleaved into 7 proteins, including three capsid proteins, by the tungro spherical virus-type peptidase Pfam:PF12381. This family represents the capsid protein 1 [1,2].

1: Nucleotide sequence and genomic organization of rice tungro spherical virus. Shen P, Kaniewska M, Smith C, Beachy RN; Virology. 1993;193:621-630. PMID:8460478

2: Rice tungro spherical virus polyprotein processing: identification of a virus-encoded protease and mutational analysis of putative cleavage sites. Thole V, Hull R; Virology. 1998;247:106-114. PMID:9683576