A helical portion of a protein structure. The hydrogen bonds form between neighbouring amino acids or such of the vicinity, so that the chain winds up to a helix. Stable, however, does not mean rigid. Due to the thermal movement all atoms within a molecule move against one another Picture below: Demonstrated on the antlers of a kudu (from C. DARWIN:The descent of man, 1871) Images courtesy of Peter v. Sengbusch
A common protein structure, found especially in hair, wool, fingernails, and animal horns, characterized by a single, spiral chain of amino acids stabilized by hydrogen bonds.
Type of protein secondary structure; a right-handed spiral.
A common secondary structure formed by segments of polypeptides.
section of the polypeptide that coils in a right-handed spiral. It is a type of protein secondary structure.
a tight helix that results from the hydrogen bonding of the carboxyl (CO) group of one amino acid to the amino (NH) group of another amino acid
a type of secondary structure for proteins
a type of secondary structure in a polysaccharide
A short, spiral-shaped section within a protein structure.
Common structural motif of proteins in which a linear sequence of amino acids folds into a right-handed helix stabilized by internal hydrogen bonding between backbone atoms.
The spiraled twist that is thought to be the shape of the protein back-bone of a normal PrPc. It is thought that four arranged together make up the central structure.
A type of secondary structure in which a chain of amino acids arranges itself in a three-dimensional spiral.
Coiled conformation of polypeptide chain found in many proteins.
A three-dimensional structure of a protein that takes on a coiled, cylindrical shape.
A common motif in the secondary structure of proteins, the alpha helix (Î±-helix) is a right-handed coiled conformation, resembling a spring, in which every backbone N-H group donates a hydrogen bond to the backbone C = O group of the amino acid four residues earlier (i+4 \rightarrow i hydrogen bonding). (See also helix.)