Protein folding
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Protein folding is the physical process by which a protein, after synthesis by a ribosome as a linear chain of amino acids, changes from an unstable random coil into a more ordered three-dimensional s
All forms of protein structure summarized
Example of a small eukaryotic heat shock protein
Amyloid
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Amyloids are aggregates of proteins characterised by a fibrillar morphology of typically 7–13 nm in diameter, a β-sheet secondary structure and ability to be stained by particular dyes, such as Congo
Protein folding
…misfolded proteins have a modified or toxic functionality. Several neurodegenerative and other diseases are believed to result from the accumulation of amyloid fibrils formed by misfolded proteins, the infectious varieties of which are known as prions. Many allergies are caused by the incorrect folding of some…
Micrograph showing amyloid deposits (pink) in small bowel. Duodenum with amyloid deposition in lamina propria. Amyloid shows up as homogeneous pink material in lamina propria and around blood vessels. 20× magnification.
Amyloid of HET-s(218–289) prion pentamer, Podospora anserina (PDB: 2rnm)
Structure of a fibril, consisting of one single protofilament, of the amyloid β peptide viewed down the long axis of the fibril (PDB: 2mlq)
Mechanisms of amyloid fibril formation including nucleated polymerisation (red arrows), nucleated conformational conversion (blue arrows), native-like aggregation (green arrows) and secondary processes (right)