Abstract: Disclosed are p53 peptidomimetic macrocycles, each p53 peptidomimetic macrocycle comprising an i, i+4 olefin staple and a polypeptide tail covalently linked to the p53 peptidomimetic macrocycle; an i, i+7 olefin staple and a polypeptide tail covalently linked to the p53 peptidomimetic macrocycle; or, an i, i+7 di-alkyne staple and optionally a polypeptide tail covalently linked to the p53 peptidomimetic macrocycle; wherein the p53 peptidomimetic macrocycle comprises all D-configuration amino acids and the polypeptide tail comprises three to nine amino acids, each amino acid of the polypeptide tail independently having a D-configuration or an L-configuration. The p53 peptidomimetic macrocycles are protease resistant, cell permeable without inducing membrane disruption, and intracellularly activate p53 by binding MDM2 and MDMX, thereby antagonizing MDM2 and MDMX binding to p53.

Abstract: The crosslinked peptidomimetic macrocycles disclosed herein comprise an alkene or alkyne staple and a poly-amino acid C-terminal tail. These crosslinked peptidomimetic macrocycles have improved binding to MDM2 and MDMX (aka MDM4), are protease resistant, cell permeable without inducing membrane disruption, and intracellularly activate p53 by binding MDM2 and MDMX thereby antagonizing MDM2 and MDMX binding to p53. These peptidomimetic macrocycles may be useful in anticancer therapies, particularly in combination with chemotherapy or radiation therapy.

Abstract: The specific molecular basis of the interaction between talin and integrin ?3 has been defined. This specific interaction provides a new therapeutic target; agents that can disrupt this specific interaction should be useful therapeutic agents for a number of significant diseases and conditions including inflammation, heart disease, including myocardial infarction, and tumor metastasis. The present invention includes a chimeric peptide that has high affinity for talin, muteins of talin and integrin ?3 as well as screening methods for agents that can disrupt the interaction between talin and integrin ?3.