Some of Schmitt s and his colleagues most promising work was done with collagen, fibrinogen, striated, and smooth muscle, along with the fibrous proteins of neurons ( Schmitt, 150 ).
32.
Fibrous proteins such as keratin or the " stalks " of myosin or kinesin often adopt coiled-coil structures, as do several four-helix bundle-is a very common structural motif in proteins.
33.
"' ?-keratin "'or "'beta-keratin "'is a protein in the keratin family . ?-keratin is rich in stacked ? pleated sheets, in contrast to alpha-keratin, a fibrous protein rich in alpha helices.
34.
A second wave of the immune response is then thought to cause cells called fibroblasts to start pumping out excessive amounts of collagen, a fibrous protein that helps hold body tissues together.
35.
He explains that proteins are composed of 100-10, 000 amino acids and he distinguishes between elongated fibrous proteins that play a mechanical role and the more numerous globular proteins that are folded upon themselves.
36.
Chemically, feathers are very different from cellulose, a long-chain carbohydrate that acts as molecular scaffolding for plants, because they are made of a fibrous protein called keratin, the fiber found in wool, hair and fingernails.
37.
Gallop, a professor of biological chemistry at the Harvard University Schools of Medicine and Dentistry, was known internationally for his work in the chemistry of collagen, the fibrous protein found in connective tissue, bone and cartilage.
38.
The same tightening effect is also seen with other wrinkle-removing techniques; for reasons that doctors say are not well understood, all of the methods seem to stimulate collagen, the fibrous protein in the skin that deteriorates with age.
39.
The three-dimensional structure of globular proteins is typically easier to determine through X-ray crystallography and nuclear magnetic resonance than both fibrous proteins and membrane proteins, which makes globular proteins more attractive for protein design than the other types of proteins.
40.
However, pioneering X-ray fiber diffraction data had been collected in the early 1930s for many natural fibrous proteins such as wool and hair by William Astbury, who proposed rudimentary models of secondary structure elements such as the alpha helix and the beta sheet.
