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Qian WJ, Park JE, Grant R, Lai CC, Kelley JA, Yaffe MB, Lee KS, Burke TR. Neighbor-directed histidine N (τ)-alkylation: A route to imidazolium-containing phosphopeptide macrocycles. Biopolymers 2016; 104:663-73. [PMID: 26152807 DOI: 10.1002/bip.22698] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2015] [Revised: 06/15/2015] [Accepted: 07/04/2015] [Indexed: 12/24/2022]
Abstract
Our recently discovered, selective, on-resin route to N(τ)-alkylated imidazolium-containing histidine residues affords new strategies for peptide mimetic design. In this, we demonstrate the use of this chemistry to prepare a series of macrocyclic phosphopeptides, in which imidazolium groups serve as ring-forming junctions. Interestingly, these cationic moieties subsequently serve to charge-mask the phosphoamino acid group that directed their formation. Neighbor-directed histidine N(τ)-alkylation opens the door to new families of phosphopeptidomimetics for use in a range of chemical biology contexts.
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Affiliation(s)
- Wen-Jian Qian
- Chemical Biology Laboratory, Center for Cancer Research, National Cancer Institute-Frederick, Frederick, MD, 21702
| | - Jung-Eun Park
- Laboratory of Metabolism, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD, 20892
| | - Robert Grant
- Department of Biology and Biological Engineering, Center for Cancer Research, Massachusetts Institute of Technology, Cambridge, MA, 02139
| | - Christopher C Lai
- Chemical Biology Laboratory, Center for Cancer Research, National Cancer Institute-Frederick, Frederick, MD, 21702
| | - James A Kelley
- Chemical Biology Laboratory, Center for Cancer Research, National Cancer Institute-Frederick, Frederick, MD, 21702
| | - Michael B Yaffe
- Department of Biology and Biological Engineering, Center for Cancer Research, Massachusetts Institute of Technology, Cambridge, MA, 02139
| | - Kyung S Lee
- Laboratory of Metabolism, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD, 20892
| | - Terrence R Burke
- Chemical Biology Laboratory, Center for Cancer Research, National Cancer Institute-Frederick, Frederick, MD, 21702
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Qian WJ, Park JE, Lim D, Lai CC, Kelley JA, Park SY, Lee KW, Yaffe MB, Lee KS, Burke TR. Mono-anionic phosphopeptides produced by unexpected histidine alkylation exhibit high Plk1 polo-box domain-binding affinities and enhanced antiproliferative effects in HeLa cells. Biopolymers 2014; 102:444-55. [PMID: 25283071 PMCID: PMC4895914 DOI: 10.1002/bip.22569] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2014] [Revised: 09/12/2014] [Accepted: 09/27/2014] [Indexed: 11/07/2022]
Abstract
Binding of polo-like kinase 1 (Plk1) polo-box domains (PBDs) to phosphothreonine (pThr)/phosphoserine (pSer)-containing sequences is critical for the proper function of Plk1. Although high-affinity synthetic pThr-containing peptides provide starting points for developing PBD-directed inhibitors, to date the efficacy of such peptides in whole cell assays has been poor. This potentially reflects limited cell membrane permeability arising, in part, from the di-anionic nature of the phosphoryl group or its mimetics. In our current article we report the unanticipated on-resin N(τ)-alkylation of histidine residues already bearing a N(π)- alkyl group. This resulted in cationic imidazolium-containing pThr peptides, several of which exhibit single-digit nanomolar PBD-binding affinities in extracellular assays and improved antimitotic efficacies in intact cells. We enhanced the cellular efficacies of these peptides further by applying bio-reversible pivaloyloxymethyl (POM) phosphoryl protection. New structural insights presented in our current study, including the potential utility of intramolecular charge masking, may be useful for the further development of PBD-binding peptides and peptide mimetics.
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Affiliation(s)
- Wen-Jian Qian
- Chemical Biology Laboratory, Center for Cancer Research, National Institutes of Health, NCI at Frederick, Frederick, MD 21702, U. S. A
| | - Jung-Eun Park
- Laboratory of Metabolism, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, U. S. A
| | - Dan Lim
- Department of Biology and Biological Engineering, Center for Cancer Research, Massachusetts Institute of Technology, Cambridge, MA 02139, U. S. A
| | - Christopher C. Lai
- Chemical Biology Laboratory, Center for Cancer Research, National Institutes of Health, NCI at Frederick, Frederick, MD 21702, U. S. A
| | - James A. Kelley
- Chemical Biology Laboratory, Center for Cancer Research, National Institutes of Health, NCI at Frederick, Frederick, MD 21702, U. S. A
| | - Suk-Youl Park
- Advanced Institutes of Convergence Technology, Seoul National University, Suwon 443-270, Republic of Korea
| | - Ki-Won Lee
- Advanced Institutes of Convergence Technology, Seoul National University, Suwon 443-270, Republic of Korea
- World Class University Biomodulation Major and Department of Agricultural Biotechnology, Seoul National University, Seoul, 151-742, Republic of Korea
| | - Michael B. Yaffe
- Department of Biology and Biological Engineering, Center for Cancer Research, Massachusetts Institute of Technology, Cambridge, MA 02139, U. S. A
| | - Kyung S. Lee
- Laboratory of Metabolism, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, U. S. A
| | - Terrence R. Burke
- Chemical Biology Laboratory, Center for Cancer Research, National Institutes of Health, NCI at Frederick, Frederick, MD 21702, U. S. A
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