Abstract
A nucleic acid binding protein (NBP) derived from the gag gene of retroviruses that is thought to interact with genomic RNA in virion cores, contains a highly conserved arrangement of cysteine residues. A search of available nucleic acid and protein sequences has revealed that the motif CysX2CysX4HisX4Cys (NBPcys) is invarient in all replication competent retroviruses, a Syrian hamster intracisternal A-particle gene, the Drosophila retrotransposon copia and in cauliflower mosaic virus (CaMV). In each case, NBPcys is located in that part of the 'gag-pol' region just preceding a conserved protease amino acid sequence. This is of special significance for CaMV as NBPcys is in the coat protein gene (ORF IV) upstream of the putative reverse transcriptase gene (ORF V) and demonstrates that the gag-pol arrangement of reverse transcribing elements is preserved in CaMV. Moreover, CaMV differs from all other known NBPcys-containing elements in that it packages a DNA genome in virions.
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Selected References
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