Question

three dimensional shape of a protein is maintained by:

44) Three-dimensional shape of a protein is maintained by A) ionic bond. B) hydrophobic interaction. C) van der Waals interaction. D) disulfide bond and interaction between radicals R. E) hydrogen bond.

Answer 1

D) disulfide bond and interaction between radicals R

the three-dimensional structure of the protein is the arrangement of atoms in the sequence of amino acid. protein molecules are either secreted as part of the extracellular matrix or attached to the outside of a cell’s plasma membrane. That proteins are directly exposed to extracellular conditions. To maintain the structure of the protein, the polypeptide chains in such proteins are stabilized by covalent cross-linkages. These covalent linkages can either bind two amino acids in the same protein, or connect different polypeptide chains in a multisubunit protein. The most common cross-linkages in proteins are covalent sulfur–sulfur bonds. These disulfide bonds (also called S–S bonds) form as proteins are being prepared for export from cells.