Exploring the candidates for a new protein folding - cross-α amyloid - in available protein databases.

Mitradip Das, B L Bhargava

Physical chemistry chemical physics : PCCP 2020 Oct 28

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Amyloid fibrils are formed from the assembly of soluble proteins and are responsible for many diseases. They are known to have a cross-β structure, where the fibril runs perpendicular to the β-sheets. A new type of tertiary structure formed by the aggregation of peptides in their α-helical form, in naturally occurring as well as synthetic peptides, termed cross-α amyloid has been reported recently. We have studied the interactions responsible for the formation of these cross-α amyloids and proposed a model to determine the peptides that could form these structures. Eight such peptides obtained using the model have been shown to form a cross-α structure using molecular dynamics simulations. The formation of a cross-α structure from eight copies of a randomly chosen peptide and its stability over a microsecond simulation have been demonstrated. A software named Cross-Alpha-Det has been developed that can determine whether a protein can form a cross-α structure from its secondary structure.

Citation

Mitradip Das, B L Bhargava. Exploring the candidates for a new protein folding - cross-α amyloid - in available protein databases. Physical chemistry chemical physics : PCCP. 2020 Oct 28;22(41):23725-23734