Abstract
Amyloids are highly organized cross β-sheet protein nanofibrils that are associated with both diseases and functions. Thermodynamically amyloids are stable structures as they represent the lowest free energy state that proteins can attain. However, recent studies suggest that amyloid fibrils can be dissociated by a change in environmental parameters such as pH and ionic strength. This reversibility of amyloids can not only be associated with disease, but function as well. In disease-associated amyloids, fibrils can act as reservoirs of cytotoxic oligomers. Recently, in higher organisms such as mammals, hormones were found to be stored in amyloid-like state, where these were reported to act as a reservoir of functional monomers. These hormone amyloids can dissociate to monomers upon release from the secretory granules, and subsequently bind to their respective receptors and perform their functions. In this book chapter, we describe in detail how these protein nanofibrils represent the densest possible peptide packing and are suitable for long-term storage. Thus, mimicking the feature of amyloids to release functional monomers, it is possible to formulate amyloid-based peptide/protein drugs, which can be used for sustained release.
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Acknowledgments
The authors wish to acknowledge DBT (BT/PR9797/NNT/28/774/2014) Government of India and Wadhwani Research Centre for Bioengineering (WRCB) for financial support.
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Jacob, R.S., Anoop, A., Maji, S.K. (2019). Protein Nanofibrils as Storage Forms of Peptide Drugs and Hormones. In: Perrett, S., Buell, A., Knowles, T. (eds) Biological and Bio-inspired Nanomaterials. Advances in Experimental Medicine and Biology, vol 1174. Springer, Singapore. https://doi.org/10.1007/978-981-13-9791-2_8
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