PMID: 9188162Jan 1, 1997Paper

An artificial HIV enhancer-binding peptide is dimerized by the addition of a leucine zipper

European Biophysics Journal : EBJ
N LiuR M Thomas

Abstract

A 42 residue artificial peptide that binds to the HIV-1 enhancers has been described previously. The specificity of interaction of the peptide with its target DNA sequence has been demonstrated by a variety of techniques. Naturally occurring regulatory proteins frequently bind to DNA as dimers, thereby increasing the strength and specificity of the interaction, the dimer interface often being provided by a leucine zipper type coiled coil. As a suitable binding site for this kind of system is located to the 5' end of the HIV enhancer region, it was decided to design and synthesize a fusion peptide that not only contained the DNA binding sequence of the original 42 residue peptide but also incorporated a leucine zipper based on that of the GCN4 transcriptional activator, that should, therefore, be capable of dimerizing. The resultant peptide, LZ66, has now been shown to be fully active in band shift and in vitro transcription assays and to exhibit about double the inhibitory activity of the parent 42 residue peptide. Preliminary CD measurements revealed that the peptide has a high alpha-helical content and that it adopts a stable conformation down to the low micromolar peptide concentration range. Sedimentation equilibrium studie...Continue Reading

Citations

May 30, 1998·Protein Science : a Publication of the Protein Society·N LiuR M Thomas
Mar 16, 2000·Proceedings of the National Academy of Sciences of the United States of America·P R MittlM G Grütter
Oct 29, 1998·Journal of Chromatography. B, Biomedical Sciences and Applications·H ChaoR S Hodges

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