Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 24, Issue 60, Pages 16066-16071Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201804428
Keywords
14-3-3 proteins; cytotoxicity; fusicoccin; phospholigands; structure-activity relationship
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Funding
- JSPS [18H02106, 18H04394, 26102727, 26220206, 16K21138]
- Nagase Science and Technology Foundation
- Astellas Foundation for Research on Metabolic Disorders
- Naito Foundation
- Uehara Memorial Foundation
- JSPS CORE-to-CORE Program Asian Chemical Biology Initiative
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Fusicoccins (FCs) exhibit various cellular activities in mammalian cells, but details of the mechanism of action are not fully understood. In this study, we synthesized two pairs of model derivatives of FCs differing only in the presence and absence of a 12-hydroxyl group and evaluated their binding to a 14-3-3 protein together with various mode 1 and mode 3 phosphopeptide ligands. Our results demonstrate that the 12-hydroxyl group hampers binding to 14-3-3 with mode 1 phospholigands, presumably due to steric repulsion with the i+2 residue. Furthermore, cell-based evaluations showed that only non-substituted FCs exhibit significant cytotoxicity and all 12-hydroxyl derivatives were inactive, demonstrating a clear correlation with their ability to form ternary complexes with 14-3-3 and a mode 1 ligand. These results suggest that binding to 14-3-3 and a partner protein(s) possessing a mode 1 sequence plays a role in the mechanism of action of 12-non-substituted FCs.
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