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Götz MG, Godwin K, Price R, Dorn R, Merrill-Steskal G, Klemmer W, Hansen H, Produturi G, Rocha M, Palmer M, Molacek L, Strater Z, Groll M. Macrocyclic Oxindole Peptide Epoxyketones-A Comparative Study of Macrocyclic Inhibitors of the 20S Proteasome. ACS Med Chem Lett 2024; 15:533-539. [PMID: 38628795 PMCID: PMC11017298 DOI: 10.1021/acsmedchemlett.4c00017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2024] [Revised: 02/22/2024] [Accepted: 03/22/2024] [Indexed: 04/19/2024] Open
Abstract
Peptide macrocycles have recently gained attention as protease inhibitors due to their metabolic stability and specificity. However, the development of peptide macrocycles with improved binding potency has so far been challenging. Here we present macrocyclic peptides derived from the clinically applied proteasome inhibitor carfilzomib with an oxindole group that mimics the natural product TMC-95A. Fluorescence kinetic activity assays reveal a high potency of the oxindole group (IC50 = 0.19 μM) compared with agents lacking this motif. X-ray structures of the ligands with the β5-subunit of the yeast 20S proteasome illustrate that the installed macrocycle forces strong hydrogen bonding of the oxindole group with β5-Gly23NH. Thus, the binding of our designed oxindole epoxyketones is entropically and enthalpically favored in contrast to more flexible proteasome inhibitors such as carfilzomib.
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Affiliation(s)
- Marion G. Götz
- Department
of Chemistry, Whitman College, Walla Walla, Washington 99362, United States
| | - Kacey Godwin
- Department
of Chemistry, Whitman College, Walla Walla, Washington 99362, United States
| | - Rachel Price
- Department
of Chemistry, Whitman College, Walla Walla, Washington 99362, United States
| | - Robert Dorn
- Department
of Chemistry, Whitman College, Walla Walla, Washington 99362, United States
| | | | - William Klemmer
- Department
of Chemistry, Whitman College, Walla Walla, Washington 99362, United States
| | - Hunter Hansen
- Department
of Chemistry, Whitman College, Walla Walla, Washington 99362, United States
| | - Gautam Produturi
- Department
of Chemistry, Whitman College, Walla Walla, Washington 99362, United States
| | - Megan Rocha
- Department
of Chemistry, Whitman College, Walla Walla, Washington 99362, United States
| | - Mathias Palmer
- Department
of Chemistry, Whitman College, Walla Walla, Washington 99362, United States
| | - Lea Molacek
- Department
of Chemistry, Whitman College, Walla Walla, Washington 99362, United States
| | - Zack Strater
- Department
of Chemistry, Whitman College, Walla Walla, Washington 99362, United States
| | - Michael Groll
- Technical
University of Munich, TUM School of Natural
Sciences, Department of Bioscience, Center for Protein Assemblies
(CPA), Ernst-Otto-Fischer
Strasse 8, 85748 Garching, Germany
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