Fig. 1.
Genome organizations of selected plant viruses with cap-independent translation elements. Bold black bars beneath genomes indicate location of cap-independent translation element. Gray bars indicate upstream sites with which 3′ elements interact. Double-headed arrows indicate positions of polyprotein cleavage on TEV and CPMV. Positions of ORFs are indicated in boxes above the RNA genome. For simplicity, only replication proteins, capsid proteins, and those proteins mentioned in the text are shown. RdRP: RNA dependent RNA polymerase; CP: coat protein; LCP: large coat protein; SCP: small coat protein; MP: movement protein. MP and CP ORFs of tobamoviruses are translated from subgenomic RNAs (not shown) as discussed in text.