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Members of this family have small genomes, composed of one or two DNA molecules of less than 3 Kb each, in which the use of coding space is optimized by bidirectional and partially overlapping open reading frames (ORFs): in one <3 Kb molecule, geminiviruses contain up to 7 ORFs, with a known maximum of 8 viral proteins per virus. This family includes nine genera, based on host range, insect vector, and genome structure: Becurtovirus, Begomovirus, Curtovirus, Eragrovirus, Mastrevirus, Topocuvirus, Turncurtovirus, Capulavirus, and Grablovirus 3 most species described to date belong to the genus Begomovirus. Geminiviruses are a family of plant viruses with circular, single-stranded (ss) DNA genomes causing devastating diseases in crops around the globe. Nevertheless, higher numbers of virus-encoded proteins might enable more sophisticated infection mechanisms, and therefore maximization of the coding space would be expected to be an advantage to the pathogen. Most viruses have small genome sizes, with the concomitant limitation in coding capacity in order to overcome the restrictions imposed by their reduced proteome, viruses have evolved to encode multifunctional proteins that efficiently target hub proteins in their host cells (reviewed in 1, 2). Viruses are intracellular parasites that heavily rely on the host cell machinery to complete their infectious cycle. These results imply that the repertoire of geminiviral proteins can be expanded, and that getting a comprehensive overview of the molecular plant-geminivirus interactions will require the detailed study of small ORFs so far neglected.
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We prove that the largest of these additional ORFs, which we name V3, is required for full viral infection, and that the V3 protein localizes in the Golgi apparatus and functions as an RNA silencing suppressor. Using tomato yellow leaf curl virus, we demonstrate that some of these small ORFs are expressed during the infection, and that the encoded proteins display specific subcellular localizations. Here, we show that geminiviral genomes contain additional ORFs. Geminivirus-encoded proteins are traditionally identified by applying a 10-kDa arbitrary threshold however, it is increasingly clear that small proteins play relevant roles in biological systems, which calls for the reconsideration of this criterion. Key Answers Traveller Workbook .Geminiviruses are plant viruses with limited coding capacity.
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