3FOD

AILSST segment from Islet Amyloid Polypeptide

Summary for 3FOD

• Entry DOI: 10.2210/pdb3fod/pdb
• Related: 3DG1 3DGJ
• Descriptor: AILSST hexapeptide segment from Islet Amyloid Polypeptide (2 entities in total)
• Functional Keywords: amyloid-like beta strand, protein fibril
• Total number of polymer chains: 8
• Total formula weight: 4725.34

Authors

Wiltzius, J.J.W.,Sawaya, M.R.,Rajashankar, K.,Eisenberg, D. (deposition date: 2008-12-29, release date: 2009-05-19, Last modification date: 2024-04-03)

Primary citation

Wiltzius, J.J.,Landau, M.,Nelson, R.,Sawaya, M.R.,Apostol, M.I.,Goldschmidt, L.,Soriaga, A.B.,Cascio, D.,Rajashankar, K.,Eisenberg, D.
Molecular mechanisms for protein-encoded inheritance.
Nat.Struct.Mol.Biol., 16:973-978, 2009

PubMed Abstract: In prion inheritance and transmission, strains are phenotypic variants encoded by protein 'conformations'. However, it is unclear how a protein conformation can be stable enough to endure transmission between cells or organisms. Here we describe new polymorphic crystal structures of segments of prion and other amyloid proteins, which offer two structural mechanisms for the encoding of prion strains. In packing polymorphism, prion strains are encoded by alternative packing arrangements (polymorphs) of beta-sheets formed by the same segment of a protein; in segmental polymorphism, prion strains are encoded by distinct beta-sheets built from different segments of a protein. Both forms of polymorphism can produce enduring conformations capable of encoding strains. These molecular mechanisms for transfer of protein-encoded information into prion strains share features with the familiar mechanism for transfer of nucleic acid-encoded information into microbial strains, including sequence specificity and recognition by noncovalent bonds.

PubMed: 19684598
DOI: 10.1038/nsmb.1643

Experimental method

X-RAY DIFFRACTION (1.4 Å)