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1997:
Jacquot E; Keller M; Yot P
A short basic domain supports a nucleic acid-binding activity in the rice tungro bacilliform virus open reading frame 2 product.
Virology 1997;
239(
2):.
Little is known about the features of badnavirus open reading frame 2 products (P2). So far, no consensus functional domain has been found in these proteins. However, they all have in common at their C-terminus amino acids which may have the capacity to bind nucleic acids. Such capacity has already been established for cacao swollen shoot virus protein P2. We have looked for such a binding capacity of rice tungro bacilliform virus (RTBV) ORF 2 product. For this purpose, the protein was expressed as full-length or truncated versions in Escherichia coli. When used in nucleic acid-binding assays, complete RTBV P2 was shown to bind both DNA and RNA. This property may be related to a basic sequence, PPKKGIKRKYPA, localized at its C-terminus. Mutations were introduced into this sequence and revealed that four of the five basic residues, including a crucial lysine, are required for the binding to nucleic acids. Moreover, this sequence can confer binding capacity when it is fused to the N-terminus of nonbinding proteins.
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