Fig. 2
From: Advances in research on maize lethal necrosis, a devastating viral disease
Schematic diagram of the gene expression strategy of maize chlorotic mottle virus (MCMV) and sugarcane mosaic virus (SCMV). a Genomic organization of MCMV. The heavy line indicates the genomic RNA and the thinner lines represent the subgenomic RNA1/2 (sgRNA1/2). The open reading frames (ORF) are marked as boxes on the genomic RNA and sgRNA1. The vertical lines (asterisks in orange) indicate the leaky stop codons leading to translational readthrough. The dashed line (P7b) represents a non-AUG start codon. CP, coat protein. b Genomic organization of SCMV. A single large polyprotein cleaved into ten mature proteins are listed within the smaller boxes that make up the ORF. P1 protease and HC-Pro release themselves from the polyprotein and other cleavages are processed by NIa-Pro. P3N-PIPO derives from frameshifting on the P3 cistron, and (A)n represents the poly(A) tail. CI, cylindrical inclusion; HC-Pro, helper-component protease; NIa-Pro, nuclear inclusion a-protease; NIb, nuclear inclusion b; PIPO, pretty interesting Potyviridae ORF; VPg, genome-linked viral protein