Helical cyclic pentapeptides constrain HIV-1 Rev peptide for enhanced RNA binding |
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Authors: | Rosemary S. Harrison,Nicholas E. ShepherdHuy N. Hoang,René e L. BeyerGloria Ruiz-Gó mez,Michael J. KelsoW. Mei Kok,Timothy A. HillGiovanni Abbenante,David P. Fairlie |
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Affiliation: | Division of Chemistry and Structural Biology, Institute for Molecular Bioscience, The University of Queensland, Brisbane, Queensland 4072, Australia |
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Abstract: | HIV-1 Rev is a 116 residue transporter protein that enters the host cell nucleus and uses its 17 amino acid segment (Rev34–50) to bind and capture a specific piece of RNA, the Rev Response Element (RRE), for transport to the cytoplasm. This is critical for HIV replication. In isolation, Rev34–50 shows negligible structure in water, but is alpha helical in a mixture of water and 2,2,2-trifluoroethanol (TFE) or when bound to RRE. Here we report that helix-constrained cyclic pentapeptides, either appended to the N-terminus or incorporated within Rev34–50, are efficient helix nucleators in water. They induce up to 90% alpha helicity for isolated Rev peptides in water and confer high RNA-binding affinity. |
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Keywords: | Cyclic peptide Alpha helix HIV-1 Rev RNA Helix induction |
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