- Proteins are the large, complex molecules that are critical for normal functioning of cells
- Made of smaller units called amino acids which are the building blocks of proteins.
- Carbon ; Hydrogen ; Oxygen ; Nitrogen ; Sulfur
- Peptides (2 or more amino acids) ; Polypeptide (10 or more amino acids) ; Proteins (50 or more amino acids)
a. Primary Structure (simply based on sequence of the amino acids found in amino acids in a polypeptide chain)
- hormone insulin has two polypeptide chains A and B
b. Secondary Structure (describes the localized shape of a protein and there are two of them we need to be familiar with alpha helix and beta pleta sheets)
- in the alpha helix and beta pleta sheets is stabilized by hydrogen bonds
c. Tertiary Structure (three dimensional structure of a polypeptide)
- 1 individual subunit
d. Quaternary Structure (multiple subunits come together then the proteins attains its quaternary structure)
