4. PROTEIN THE UNIT OF LIVING ORGANISMS
12/26/2013
Structural proteins
Regulatory or hormonal proteins
Enzymes (catalytic proteins)
Transport proteins
Immune Proteins
Contractile Proteins
Storage Proteins
4
5. PROTEIN THE UNIT OF LIVING ORGANISMS
12/26/2013
Structural Proteins
fibrous and stringy and provide support.
e.g.; include keratin, collagen, and elastin.
Hormonal Proteins
messenger proteins which help to coordinate certain
bodily activities.
e.g.; insulin, oxytocin, and somatotropin.
5
6. PROTEIN THE UNIT OF LIVING ORGANISMS
12/26/2013
Enzymes (catalytic proteins)
proteins that facilitate biochemical reactions.
increase the rate of a reaction.
act specifically with only one reactant (called a
substrate) to produce products.
If even one enzyme is missing or defective, the results
can be disastrous.
e.g.; lactase and pepsin.
6
7. PROTEIN THE UNIT OF LIVING ORGANISMS
12/26/2013
Transport Proteins
are carrier proteins which move molecules from one
place to another around the body.
e.g.; hemoglobin and cytochromes.
7
8. PROTEIN THE UNIT OF LIVING ORGANISMS
Immune Proteins(Antibodies)
12/26/2013
specialized proteins involved in defending the body from
antigens (foreign invaders).
Contractile Proteins
responsible for movement.
proteins are involved in muscle contraction and
movement.
e.g.; actin and myosin
8
9. PROTEIN THE UNIT OF LIVING ORGANISMS
12/26/2013
Storage Proteins
a source of amino acids for growing organisms,
serve as reserves of metal ions and amino acids
can be mobilized and utilized for the maintenance and
growth of organisms.
particularly prevalent in plant seeds, egg whites, and
milk.
e.g.; ovalbumin and casein.
9
10. PROTEIN AS NUTRIENT
12/26/2013
Around 40% of the body’s dry matter is protein.
If body loses more than 14% of its Protein store, it
could lead to severe health consequences.
Loss of muscle mass causing physical weakness.
Fatigue
A weakened immune system.
Abnormal blood clotting.
Kwashiorkor
Marasmus
Brittle nails
10
