Is [alpha]-Keratin a Coiled Coil?

Is [alpha]-Keratin a Coiled Coil?

Contributor(s):
Crick, Francis, 1916-2004
Nature
Publication:
Nature Publishing Group, 22 November 1952
Language(s):
English
Format:
Text
Genre(s):
Archival Materials
Articles
Abstract:
During the 1950s Crick made important contributions not only to the study of DNA and the genetic code, but to X-ray protein structure analysis. Establishing the three-dimensional molecular structure of various proteins from X-ray diffraction patterns was a major goal, and a major challenge, for X-ray crystallographers and protein chemists at the time. Crick was instrumental in extending helical diffraction theory to construct such three-dimensional maps of protein molecules from X-ray data. In this paper, he proposes a brilliant simplification by which alpha keratin, the prototypical fibrous protein of which nails and hair are made, could be shown to consist of two Pauling-Corey alpha helixes, slightly deformed and coiling around one another, with the amino acid protrusions from one helix fitting into corresponding holes in the other. The bending, or deformation, in the axis of each alpha helix meant that it was twisted into a higher-order, larger helix. Crick went on to calculate the complicated X-ray diffraction pattern such a super helix, or coiled coil, would produce.
Copyright:
This item may be under copyright protection; contact the copyright owner for permission before re-use.
Extent:
2 pages
NLM Unique ID:
101584582X380 (See in Profiles in Science)
Profiles in Science ID:
SCBBYV
Permanent Link:
http://resource.nlm.nih.gov/101584582X380
Archival Collection:
The Francis Crick Papers (Profiles in Science)