1. Inhibition of tau aggregation using a naturally-occurring cyclic peptide scaffold
- Author
-
David J. Craik, Yen-Hua Huang, Susan E. Northfield, Conan K. Wang, and Mariana C. Ramos
- Subjects
Models, Molecular ,0301 basic medicine ,Amyloid ,Amyloid beta ,Molecular Sequence Data ,tau Proteins ,Peptide ,macromolecular substances ,Protein aggregation ,010402 general chemistry ,Fibril ,Peptides, Cyclic ,Protein Aggregation, Pathological ,01 natural sciences ,Protein Aggregates ,03 medical and health sciences ,Drug Discovery ,Humans ,Amino Acid Sequence ,Peptide sequence ,Pharmacology ,chemistry.chemical_classification ,Oligopeptide ,biology ,Chemistry ,Organic Chemistry ,Cystine knot ,General Medicine ,Cyclic peptide ,0104 chemical sciences ,030104 developmental biology ,Tauopathies ,Biochemistry ,Drug Design ,biology.protein ,Oligopeptides ,Sequence Alignment - Abstract
Disulfide-rich macrocyclic peptides are emerging as versatile scaffolds for the development of stable biochemical tools. This potential is due to the combination of their structural stability and range of bioactivities. Here, we explored the activity of these peptides on fibril growth of the hexapeptide Ac-VQIVYK-NH2 (AcPHF6), which is a tau-derived peptide that has been widely used to understand the pathological mechanism of numerous tauopathies, including Alzheimer's disease. Of the cyclic peptides tested, SFTI-1 and kB1 showed an inherent ability to inhibit AcPHF6 fibril formation. Using an end-capping strategy and combining it with a molecular grafting approach, we demonstrated that SFTI-1 could be used as a starting point to design more potent fibril inhibitors. We further identified chemical and structural features of SFTI-1 and its analogues that underpin their inhibitory activity. The ability to inhibit fibril growth using the strategy employed herein supports the 'steric zipper' model of AcPHF6 fibril formation and shows that naturally-occurring cyclic peptides have potential as drug leads or molecular probes for understanding fibril formation.
- Published
- 2016