Nutritional & Structural classification of protein

1. Class 4
Classification based onClassification based on
Nutritional ValueNutritional Value
&&
Shape of proteinsShape of proteins

2. ProteinsProteins
 Organic compoundsOrganic compounds
 Contains C, H,O, N, AND P ,SContains C, H,O, N, AND P ,S
 Mixed polymer of amino acidsMixed polymer of amino acids
 Linked together by peptide bondsLinked together by peptide bonds
N terminal
C terminal
H2N COOH
Polypeptide / Protein
n

3. Classification of ProteinsClassification of Proteins
1.1. Based on FunctionsBased on Functions
2.2. Based on Nutritional valueBased on Nutritional value
3.3. Based on Shape & StructureBased on Shape & Structure
4.4. Based on Chemical compositionBased on Chemical composition

4.  Nutritional value is determined byNutritional value is determined by
the presecence of essential aminothe presecence of essential amino
acidsacids
Classification based onClassification based on
Nutritional valueNutritional value
1. Complete Proteins - 1st
class proteins
2.2. Incomplete ProteinsIncomplete Proteins
3.3. Partially Incomplete ProteinsPartially Incomplete Proteins

5. Classification based onClassification based on
Nutritional valueNutritional value
 Complete Proteins -Complete Proteins -
11stst
class proteinsclass proteins
 All essential amino acidsAll essential amino acids
present in properpresent in proper
proportionproportion
 Good for health andGood for health and
balanced growthbalanced growth
 Egg protein, MilkEgg protein, Milk
proteins, Fish, meat,proteins, Fish, meat,
cheesecheese
 Incomplete ProteinsIncomplete Proteins
 Lack one or moreLack one or more
essential amino acidsessential amino acids
 Can not supportCan not support
expected growth andexpected growth and
health completelyhealth completely
 Proteins from plants andProteins from plants and
cereals, beans, nut ,cereals, beans, nut ,
GelatinGelatin
 Food blend is the solutionFood blend is the solution

6. Partially incomplete proteinsPartially incomplete proteins
 Proteins contains essential amino acidsProteins contains essential amino acids
but not enough to meet the metabolicbut not enough to meet the metabolic
need of organismneed of organism
 EX: Proteins from Wheat , Rice , CornEX: Proteins from Wheat , Rice , Corn

7. Classification based onClassification based on
Physical Shape and StructurePhysical Shape and Structure
Over all shape is determined on the basis
of AXIAL RATIO
i.e. Length / Width ratio

8. Classification based onClassification based on
Physical Shape and StructurePhysical Shape and Structure
Fibrous Proteins
Length
width
 Fibrous Proteins
 Axial ratio more than 10
 Length : width ratio is more
than 10
 Molecules are elongated
 Show helix, H bond, covalent
bond
 Play structural role
 Myosin, Actin, Keratin, Fibrin,
Collagen, Elastin, Tropomyosin

9. Classification based onClassification based on
Physical Shape and StructurePhysical Shape and Structure
Globular Proteins
Length
width
 Globular Proteins
 Axial ratio generally 3 or 4
 Length : width ratio is less
than 10
 Molecule is Spherical / Oval
 Easily soluble in water ,
Digestible
 Play dynamic functions
 Albumin, Globulin, Protamines,
 Enzymes

10.  Fibrous Proteins
 Play structural role
 Insoluble in water ,
 non -digestible
 Myosin, Actin, Keratin, Fibrin,
Collagen, Elastin
 Globular Proteins
 Soluble in water, digestible
 Play dynamic functions
 Albumin, Globulin, Protamines
Classification based onClassification based on
Physical Shape and StructurePhysical Shape and Structure

11. Functions of fibrous proteinFunctions of fibrous protein
 Mechanical functionMechanical function
 Provide strength contractile characterProvide strength contractile character
 Provide net work for calcification ofProvide net work for calcification of
bonebone

12. Functions of Globular proteinFunctions of Globular protein
 Dynamic proteinsDynamic proteins
 EnzymesEnzymes
 HormonesHormones
 Carrier proteinsCarrier proteins
 Nutritive and oncotic pressureNutritive and oncotic pressure

13. Next classNext class
Functional classificationFunctional classification
of proteinof protein