The Tomato Yellow Leaf Curl Virus Genome and Function of its Proteins
In the following, an overview on the genome organisation of tomato (yellow) leaf curl viruses will be presented. Also, a brief description of the biological functions of the viral proteins will be given. The nomenclature including acronyms for some TYLCV species was changed since their first description, in the following the ICTV-approved designations given in Stanley et al. (2005) are used. Most data referred to are derived from studies with Tomato yellow leaf curl virus (TYLCV) [GenBank acc. no. X15656] (Navot et al., 1991), Tomato yellow leaf curl Sardinia virus (TYLCSV) [X61153] (Kheyr-Pour et al., 1991), Tomato leaf curl virus (ToLCV) [S53251] (Dry et al., 1993), and Tomato leaf curl New Delhi virus (ToLCNDV) [U15015, U15017] (Padidam et al., 1995), a bipartite TYLCV species.
Tomato (yellow) leaf curl viruses belong to the genus Begomovirus within the family Geminiviridae. Most begomovirus species have a bipartite genome of two circular single-stranded (ss)DNA molecules, DNA-A (2.6–2.8 kbases) and DNA-B (2.5–2.8 kbases). Begomoviruses are transmitted by the whitefly Bemisia tabaci in a circulative and persistent manner. TYLCV and TYLCSV were the first begomoviruses proven to possess a single genomic DNA. Consequently, essential viral functions, otherwise encoded by DNA-B, have to be provided by proteins encoded by the single DNA of TYLCV, TYLCSV, ToLCV, and all other true monopartite tomato (yellow) leaf curl viruses.
KeywordsZinc Adenosine Oligomer Assure Thymidine
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