Role OR function of proteins Biological value of proteins

1. BIOCHEMISTRY AND CLINICAL
PATHOLOGY
D.Pharm 1st year
TOPIC- PROTEINS
Part-2
Presented by-
SHWETA MISHRA
HYGIA GROUP OF INSTITUTION

2. CONTENTS
❏ Role or function of Proteins
❏ Biological value of Proteins

3. ROLE OR FUNCTION OF PROTEINS
❏ Protein is primarily used in the body to build, maintain and repair
body tissues.
❏ Protein is the major source of energy.
❏ Protein produces enzymes that increases the rate of chemical
reactions reactions in the body.
❏ Protein helps to store other substance in the organism. Eg. Iron
is stored in the liver in a complex with the protein Ferritin.
❏ They provide structural frame-work for cells and tissues.
❏ They act as enzymes and hormones.

4. ❏ Protein exert osmotic pressure which helps in maintaining
electrolyte and water balance.
❏ Proteins can be catabolised to release energy.
❏ Receptor proteins binds with specific substances like vitamins and
minerals and mediate their cellular action.
❏ They help in muscle contraction(myosin, actin).
❏ They help in maintaining osmotic pressure.
❏ They help in the process of coagulation(Thrombin, Fibrinogen).
❏ They help in acid-base balance of the body.
❏ During starvation proteins(amino acids) serve as the major
suppliers of energy.

5. ❏ Cell secretion such as mucus(glycoproteins) help in protection
and provide a slippery texture.
❏ G-protein is one of the regulatory proteins by which the
hormonal signals are transmitted to the nucleus in the cell.
❏ Proteins also control DNA replication, protein synthesis, chain
initiation, chain termination etc.

6. BIOLOGICAL VALUE OF PROTEINS
❏ Karl Thomas has first used the term biological value.
❏ Biological value of protein is used as a measure of protein
quality.
❏ Biological value is defined as the “percentage of absorbed
nitrogen which is retained retained in the body”.
BV= N2 retained
N2 absorbed 100

7. Eg. Bread Eg. Meat
Cereals Fish
Nuts Eggs
Pulses Milk
Cheese
Low
biological
value
foods
High
biological
value
foods

8. THANK YOU