The Alzheimer's peptide a beta adopts a collapsed coil structure in water.
Zhang, S., Iwata, K., Lachenmann, M.J., Peng, J.W., Li, S., Stimson, E.R., Lu, Y., Felix, A.M., Maggio, J.E., Lee, J.P.(2000) J Struct Biol 130: 130-141
- PubMed: 10940221 
- DOI: 10.1006/jsbi.2000.4288
- Primary Citation of Related Structures:  
1HZ3 - PubMed Abstract: 
The self-assembly of the soluble peptide Abeta into Alzheimer's disease amyloid is believed to involve a conformational change. Hence the solution conformation of Abeta is of significant interest. In contrast to studies in other solvents, in water Abeta is collapsed into a compact series of loops, strands, and turns and has no alpha-helical or beta-sheet structure ...