Amino Acids, Proteins and Porphyrins
Keratin is chemically
|D||None of the above|
The proteins of hair, nail, skin contain a group of proteins called keratin rich in α-helical structure secondary structure →established by disulfide bond (strong, high energy - covalent bond) and hydrogen bonds (weak, Low energy, non-covalent bonds).
a. Small or Uncharged amino-acids residues such as Alanine, Leucine, and phenylalanine are often found in α-helix.
b. Classes of Inter mediate filaments
i. Keratin (found in Hair, nail, skin)
ii. Vimentin like: - vimentin (mesenchymal cells) Desmin (Muscles), Glial fibrillary acid protein (glial cells) Peripherin (neurons)
iii. Neurofilaments found in Neurons
iv. Lamins (A,B,C) found in laminae