SOURCES OF PROTEIN :
Proteins are of both animal and plant origin. Some of the common sources are given bellow ..
# Whole cereals,
# Among plants
# Fish Egg,
# Cheese among animal products.
COMPOSITION OF PROTEIN:
The proteins are polymers made of monomers called the amino acids. There are 20 different kinds of amino acids that make up the proteins. However, they are present in different proportions in each of the proteins. The type and the sequence of amino acids in a protein are specified by the DNA in the cell that produces them. This sequence of amino acids is essential since it determines the overall structure and function of a protein.
Domains, motifs, and folds in protein structure proteins are made up of:
• Carbon (C)
• Hydrogen (H)
• Oxygen (O)
• Nitrogen (N)
• and some proteins contain Sulfur (S)
A protein is a natural polymer, made up of amino acid monomers joined together by peptide bonds (peptide or amide linkages).
• A dipeptide is made up of 2 amino acids joined together by a peptide bond (peptide or amide linkage)
• A tripeptide is made up of 3 amino acids joined together by peptide bonds (peptide or amide linkages)
• A tetrapeptide is made up of 4 amino acids joined together by peptide bonds (peptide or amide linkages)
• A polypeptide is made up of many amino acids joined together by peptide bonds (peptide or amide linkages)
A peptide bond (peptide or amide linkage) is a covalent bond formed between the carbon of the carboxyl group of one amino acid and the nitrogen of the amine group of another amino acid as shown below:
– C – N –