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Targeting the amyloid-β fibril surface by constrained helical peptide inhibitor.

07:00 EST 8th November 2019 | BioPortfolio

Summary of "Targeting the amyloid-β fibril surface by constrained helical peptide inhibitor."

Amyloid-β (Aβ) oligomers are well-known toxic molecular species associated with Alzheimer's disease. Recent discoveries of the ability of amyloid fibril surfaces to convert soluble proteins into toxic oligomers suggested that these surfaces could serve as therapeutic targets for intervention. We have shown previously that a short helical peptide could be a key structural motif that can specifically recognize the K16-E22 region of Aβ40 fibril surface with an affinity at the level of several micromolar. Here, we demonstrated that in-tether chiral center-induced helical stabilized peptides were also able to recognize the fibril surfaces, effectively inhibiting the surface-mediated oligomerization of Aβ40. Moreover, through extensive computational sampling, we observed two distinct ways in which the peptide inhibitors recognize the fibril surface. Apart from a binding mode that, in accord with the original design, involves hydrophobic sidechains at the binding interface, we observed with a much higher chance another binding mode in which the hydrophobic staple interacts directly with the fibril surface. The affinity of the peptides for the fibril surface could be adjusted by tuning the hydrophobicity of the staple. The best candidate investigated here exhibits an affinity at sub-micromolar level (~0.75 μM). Collectively, this work opens an avenue for the rational design of candidate drugs with stapled peptides for amyloid-related disease.

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Name: Biochemistry
ISSN: 1520-4995
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Medical and Biotech [MESH] Definitions

Peptides generated from AMYLOID BETA-PEPTIDES PRECURSOR. An amyloid fibrillar form of these peptides is the major component of amyloid plaques found in individuals with Alzheimer's disease and in aged individuals with trisomy 21 (DOWN SYNDROME). The peptide is found predominantly in the nervous system, but there have been reports of its presence in non-neural tissue.

A family of non-fibrillar collagens that interact with FIBRILLAR COLLAGENS. They contain short triple helical domains interrupted by short non-helical domains and do not form into collagen fibrils.

A type of extracellularly deposited substance composed of an amyloid protein and additional components including HEPARAN SULFATE PROTEOGLYCAN; LAMININ; COLLAGEN TYPE IV; SERUM AMYLOID P-COMPONENT; and APOLIPOPROTEINS E which together form characteristic amyloid fibrils. The core of amyloid fibrils is formed by the stacking of overlapping beta-pleated sheet domains of the amyloid protein. There are many different amyloid proteins that have been found forming the core of the fibrils in vivo. However, amyloid can be formed from any protein that exposes beta-pleated strand conformations during unfolding or refolding. A common characteristic of amyloid is the ability to bind such dyes as CONGO RED and thioflavine.

A rho GDP-dissociation inhibitor subtype that has a unique C-terminal alpha helical membrane-binding domain. It is found bound to CYTOPLASMIC VESICLES such as those associated with the GOLGI APPARATUS.

Proteins that form the core of amyloid fibrils. For example, the core of amyloid A is formed from amyloid A protein, also known as serum amyloid A protein or SAA protein.

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