Histidine N(τ)-cyclized macrocycles as a new genre of polo-like kinase 1 polo-box domain-binding inhibitors

BIOORGANIC & MEDICINAL CHEMISTRY LETTERS

卷:28

Article

Hymel, David¹  Grant, Robert A.²  Tsuji, Kohei¹  Yaffe, Michael B.²  Burke, Terrence R., Jr.¹ 

[1] Natl Canc Inst Frederick, Ctr Canc Res, Chem Biol Lab, Frederick, MD 21702 USA

[2] MIT, Dept Biol & Biol Engn, Cambridge, MA 02139 USA

关键词: Plk1 polo-box domain;    Protein-protein interaction;    Macrocyclic peptide mimetic;    Conformational constraint;   

DOI  :  10.1016/j.bmcl.2018.08.018

来源: Elsevier

【 摘 要 】

Transition toward peptide mimetics of reduced size is an important objective of peptide macrocyclization. We have previously shown that PLH*SpT (2a) (where H* indicates the presence of a -(CH2)(8)Ph group at the N(pi) position and pT indicates phosphothreonine) is an extremely high affinity ligand of the polo-like kinase 1 (Plk1) polo-box domain (PBD). Herein we report that C-terminal macrocyclization of 2a employing N(pi),N(tau)-bis-alkylated His residues as ring junctions can be achieved in a very direct fashion. The resulting macrocycles are highly potent in biochemical assays and maintain good target selectivity for the Plk1 PBD versus the PBDs of Plk2 and Plk3. Importantly, as exemplified by 5d, our current approach permits deletion of the N-terminal Pro-Leu motif to yield tripeptide ligands with decreased molecular weight, which retain high affinity and show improved target selectivity. These findings could fundamentally impact the future development of peptide macrocycles in general and Plk1 PBD-binding peptide mimetics in particular.

【 授权许可】

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