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J Am Chem Soc. 2012 Sep 12;134(36):14734-7. doi: 10.1021/ja306864v. Epub 2012 Sep 4.

Rational design of proteolytically stable, cell-permeable peptide-based selective Mcl-1 inhibitors.

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Department of Chemistry, State University of New York at Buffalo, Buffalo, New York 14260-3000, USA.


Direct chemical modifications provide a simple and effective means to "translate" bioactive helical peptides into potential therapeutics targeting intracellular protein-protein interactions. We previously showed that distance-matching bisaryl cross-linkers can reinforce peptide helices containing two cysteines at the i and i+7 positions and confer cell permeability to the cross-linked peptides. Here we report the first crystal structure of a biphenyl-cross-linked Noxa peptide in complex with its target Mcl-1 at 2.0 Å resolution. Guided by this structure, we remodeled the surface of this cross-linked peptide through side-chain substitution and N-methylation and obtained a pair of cross-linked peptides with substantially increased helicity, cell permeability, proteolytic stability, and cell-killing activity in Mcl-1-overexpressing U937 cells.

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