CHEMISTRY OF
AMINO ACIDS & PROTEINS
,• The term protein is derived from the Greek word
Proteios which means primary or holding first place
• Widely distributed in all cells
• Genetic information in DNA expressed as proteins
Elements in protein – C,H,O,N
• Nitrogen content of proteins(16% by wt )
• Phosphorous and Sulphur are minor constituents
Proteins are made of polymerization of amino acids
through peptide bonds
, Chemistry of Amino acids
General formula
There are 20 naturally occurring Amino acids
Except Proline all are Alpha Amino acids meaning
amino group & carboxyl group are attached to the
same α carbon atom.
R represents the side chain
21st a.a Selenocysteine
22nd a.a pyrrolysine α
, Classification of amino acids
A. Based on Structure
B. Based on side chain
C. Based on Metabolic fate
D. Based on nutritional requirements
AMINO ACIDS & PROTEINS
,• The term protein is derived from the Greek word
Proteios which means primary or holding first place
• Widely distributed in all cells
• Genetic information in DNA expressed as proteins
Elements in protein – C,H,O,N
• Nitrogen content of proteins(16% by wt )
• Phosphorous and Sulphur are minor constituents
Proteins are made of polymerization of amino acids
through peptide bonds
, Chemistry of Amino acids
General formula
There are 20 naturally occurring Amino acids
Except Proline all are Alpha Amino acids meaning
amino group & carboxyl group are attached to the
same α carbon atom.
R represents the side chain
21st a.a Selenocysteine
22nd a.a pyrrolysine α
, Classification of amino acids
A. Based on Structure
B. Based on side chain
C. Based on Metabolic fate
D. Based on nutritional requirements
