Primary, Secondary, Tertiary and Quaternary Structures of Proteins
Protein structure depends on its amino acid sequence and local, low-energy chemical bonds between atoms in both the polypeptide backbone and in amino acid side chains.
Protein structure plays a key role in its function; if a protein loses its shape at any structural level, it may no longer be functional.
Primary structure is the amino acid sequence.
Secondary structure is local interactions between stretches of a polypeptide chain and includes α-helix and β-pleated sheet structures.
Tertiary structure is the overall the three-dimension folding driven largely by interactions between R groups.
Quaternary structures is the orientation and arrangement of subunits in a multi-subunit protein.
Problem:
Which of the following best describes the quaternary structure of a protein?
A) How the polypeptide chains fit together
B) The layout of alpha-helices and beta-sheets
C) The four parts of a protein’s amino acid sequence
D) The sequence of nucleic acids
E) The polypeptide chain’s complete 3-D structure
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