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It was previously shown that, unlike the type member of the genus Tobamovirus (TMV U1), a crucifer-infecting tobamovirus (crTMV) contains a 148 nt internal ribosome entry site (IRES)(CP,148)(CR) upstream of the coat protein (CP) gene. Here, viral vectors with substitutions in the stem-loop (SL) region of CP subgenomic promoters (TMV U1-CP-GFP/SL-mut and crTMV-CP-GFP/SL-mut) were constructed and the levels of CP synthesis in agroinoculation experiments were compared. No CP-GFP (green fluorescent protein) synthesis was detected in Nicotiana benthamiana leaves inoculated with TMV U1-CP-GFP/SL-mut, whereas a small amount of CP-GFP synthesis was obtained in crTMV-CP-GFP/SL-mut-injected leaves. Northern blots proved that both promoters were inactive. It could be hypothesized that IRES-mediated early production of the CP by crTMV is needed for realization of its crucifer-infecting capacity.

An internal ribosome entry site located upstream of the crucifer-infecting tobamovirus coat protein (CP) gene can be used for CP synthesis in vivo