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. 1992 Apr 1;89(7):2723–2726. doi: 10.1073/pnas.89.7.2723

Specific binding of arginine to TAR RNA.

J Tao 1, A D Frankel 1
PMCID: PMC48734  PMID: 1557378

Abstract

A single arginine residue within the basic region of the human immunodeficiency virus Tat protein mediates specific binding of Tat peptides to a three-nucleotide bulge in TAR RNA. It has been proposed that arginine recognizes TAR by forming a network of hydrogen bonds with two structurally distinct phosphates, an interaction termed the "arginine fork." Here it is shown that L-arginine blocks the Tat peptide/TAR interaction, whereas L-lysine and analogs of arginine that remove specific hydrogen bond donors do not. Experiments using an L-arginine affinity column demonstrate that arginine and the Tat peptides bind to the same site in TAR. Modification of two phosphates located at the junction of the double-stranded stem and bulge and modification of two adenine N7 groups in base-paired regions of TAR interfere with specific arginine binding. The results emphasize the importance of RNA structure in RNA-protein recognition and provide methods to identify arginine-binding sites in RNAs.

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Selected References

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