Protein Classification Based on Chemical Composition

Question 1

2 Types of Protein

Answer 1

1. Simple Protein

2. Conjugated Protein

Question 2

6 Types of Conjugated Proteins

Answer 2

1. Nucleoprotein
2. Chromoprotein
3. Lipoprotein
4. Mucoprotein
5. Phosphoprotein
6. Metalloproteins

Question 3

5 Types of Simple Proteins

Answer 3

1. Albumins
2. Globulins
3. Glutelins
4. Prolamins
5. Scleroproteins or Albuminoids

Question 4

It is made up of amino acid subunits joined together by peptide bonds?
In hydrolysis they yield only the amino acids and occasional small carbohydrate compounds?

Answer 4

Simple Proteins

Question 5

Composed of simple proteins include materials such as carbohydrates, lipids, bound metal ions, nonprotein substance (prosthetic group) and other organic groups.

Answer 5

Conjugated Proteins

Question 6

READ: Albumins

Answer 6

• These are soluble in water and diluted in aqueous solution.
• Can be coagulated by heat and precipitated from solution using saturated ammonium sulfate.
coagulated means it can be form as solid

Question 7

What do you called the albumin in egg?

Answer 7

Egg albumin

Question 8

What do you called the albumin in milk?

Answer 8

Lactoalbumin or lactalbumin

Question 9

What do you called the albumin in blood?

Answer 9

Serum albumin

Question 10

What do you called the albumin in muscles?

Answer 10

Myogen

Question 11

What do you called the albumin in peas?

Answer 11

Legumin

Question 12

READ: Globulins

Answer 12

• These are insoluble in water but soluble in diluted salt solution.
• It can coagulated by heat, and precipitate using half salt saturated solution ammonium sulfate.
• Mostly it found in nuts.

Question 13

What do you called the globulin in egg yolk?

Answer 13

Ovoglobulin

Question 14

What do you called the globulin in muscles?

Answer 14

Myosin

Question 15

What do you called the globulin in beans?

Answer 15

Phascolin

Question 16

What do you called the globulin in almonds?

Answer 16

Amandin

Question 17

What do you called the globulin in peanuts?

Answer 17

Arachin

Question 18

READ: Glutelins

Answer 18

• These are soluble in diluted solution of acid and alkalies (bases).
• it is insoluble in water and neutral solvents
• It only occur in plants.

Question 19

What do you called the glutelins in wheat?

Answer 19

Glutenin

Question 20

What do you called the glutelins in rice?

Answer 20

Oryzenin

Question 21

READ: Scleroproteins or Albuminoids

Answer 21

• These are insoluble in all neutral solvents, dilute acid and alkalies (bases).
• Entirely in animal proteins and constituents of exoskeletal structure connecting ang supporting fibrous tissues.

Question 22

What do you called the albumin in hair, horn and nails?

Answer 22

Keratin

Question 23

What do you called the albumin in bones?

Answer 23

Collagen

Question 24

What do you called the albumin in silk?

Answer 24

Fibroin and Sericin

Question 25

What do you called the albumin in our connective tissues?

Answer 25

Elastin

Question 26

READ: Prolamins

Answer 26

* It is soluble in 70-80% of ROH * But insoluble in absolute ROH, in water, and neutral solvents. * Rich in Proline upon hydrolysis. * Usually found in plants - mostly seeds

Question 27

What do you called the prolamin in corn?

Answer 27

Zein

Question 28

What do you called the prolamin in wheat?

Answer 28

Gliadine

Question 29

What do you called the prolamin in barley?

Answer 29

Hordein

Question 30

What do you called the prolamin in kafir corn?

Answer 30

Kafirin

Question 31

READ: Nucleoprotein

Answer 31

* Composed with simple protein in salt combination with nucleic acids (prosthetic group) * Most abundant in plant and animal tissues that have a large proportion to nuclear materials. * Examples are yeast, asparagus tips, thymes, and other glandular organs such as organ and sperm.

Question 32

READ: Mucoprotein or Mucoids

Answer 32

* Simple protein in combination with mucopolysaccharides. * Present in tendons, bones, cartillages, and umbilical cord. * Also present in all animal mucins and blood-group substances.

Question 33

READ: Chromoproteins

Answer 33

* Simple protein in combination with colored prosthetic group. (Chroma means color) * Hemoglobin - a respiratory proteins in which the prosthetic group in the iron-containing complex, heme. It is the iron-containing oxygen-transport metalloprotein in the red blood cells. * Cytochromes - prosthetic group is heme * Flavoproteins - prosthetic group is riboflavin. * Retins - Prosthetic group is carotenoid pigment (in carrots) * Catalase - it is enzyme that decomposes hydrogen peroxide (H2O2)

Question 34

READ: Prosphoprotein

Answer 34

* Simple protein combined with phosphoric acid | * Examples are casein from milk and vitellin from egg yolk.

Question 35

READ: Metalloprotein

Answer 35

``` • Enzyme protein containing metallic elements • Examples are: Fe - ferretin Zn - alcohol dehydrogenase Ca - calmodulin Mo - dinitrogenase Cu - plastocyatin ```

Question 36

READ: Lipoprotein

Answer 36

* Proteins formed by combination of proteins with lipids such as lecithin and cephalin * Soluble in organic solvents but insoluble in water. * Phospholipid protein complex (lecithoprotein) - found in animal and plant such as milk, blood, cell nuclei, egg yolk etc. * Also found in bacterial antigens and viruses