PMID: 18339938 , Related PDB id: 2RNM

Authors:

Wasmer C, Lange A, Van Melckebeke H, Siemer AB, Riek R, Meier BH

Title:

Amyloid fibrils of the HET-s(218-289) prion form a beta solenoid with a triangular hydrophobic core.

Journal:

Science. 2008 Mar 14;319(5869):1523-6.

Abstract:

Prion and nonprion forms of proteins are believed to differ solely in their three-dimensional structure, which is therefore of paramount importance for the prion function. However, no atomic-resolution structure of the fibrillar state that is likely infectious has been reported to date. We present a structural model based on solid-state nuclear magnetic resonance restraints for amyloid fibrils from the prion-forming domain (residues 218 to 289) of the HET-s protein from the filamentous fungus Podospora anserina. On the basis of 134 intra- and intermolecular experimental distance restraints, we find that HET-s(218-289) forms a left-handed beta solenoid, with each molecule forming two helical windings, a compact hydrophobic core, at least 23 hydrogen bonds, three salt bridges, and two asparagine ladders. The structure is likely to have broad implications for understanding the infectious amyloid state.