Classification of protein based on shape, Biology

Assignment Help:

Protein Classification Based on Shape

There are three types of proteins on the basis of shape - Fibrous, Globular, Intermediate

1.       FIBROUS PROTEINS

  1. They are thread-like elongated proteins which have little or no tertiary structure.
  2. Secondary structure in the final structure in fibrous proteins.
  3. All the three types of secondary structure occur in fibrous proteins.
  4. Fibrous proteins occur singley or join together in coils and bundles to form fibres.
  5. They are nonenzymatic proteins which are insoluble in water, produce structural components, provide rigidity and elasticity.
  6. Common fibrous proteins are collagen (connective tissue, tendon, cartilage, bone teeth), keratin (skin, hair, beaks, feathers, claws, nails, hoofs, horns), fibroin (silk, spider webs), elastin, tropomyosin, paramyosin, fibrin (blood clot), etc.

2.       GLOBULAR PROTEINS

  1. They are rounded, over or oblong in outline.
  2. The shape is achieved through tertiary and quaternary folding of polypeptides.
  3. Most of the proteins are globular in nature.
  4. They are not contractile but otherwise from all other types of proteinaceous structures, both enzymatic and non-enzymatic (including antibodies and hormones).
  5. Their solubility in water depends upon size.
  6. Smaller globular proteins are soluble in water.
  7. They are also not coagulated by heat, e.g., histones.
  8. With increase in size the globular proteins become sparingly soluble in water and develop the tendency to get coagulated by heat.
  9. Albumins are soluble in water but are coagulated by heat, e.g., egg albumin. Globulins (e.g., Serum globulins) and glutenins (e.g., Wheat, Maize) are both insoluble in water and coagulate with application of heat.

3.       INTERMEDIATE PROTEINS

  1. They are neither fibrous nor globular but of intermediate from and characteristics.
  2. Myosin with some 1700 amino acid residues in its polypeptide is not fibrous but assumes an extended from in solution.
  3. Fibrinogen is a highly soluble extended but somewhat asymmetric protein that forms insoluble fibrin in coagulated blood.

Related Discussions:- Classification of protein based on shape

What is the rh factor, What is the Rh factor? The RH factor is a protei...

What is the Rh factor? The RH factor is a protein of the red blood cell plasma membrane that behaves as antigen in blood transfusions triggering a humoral (antibody-based) immu

Regulation of pfk and fructose 1, When the level of AMP is high, this shows...

When the level of AMP is high, this shows the requirement for more ATP synthesis. AMP stimulates PFK increases the rate of glycolysis and inhibits fructose 1 and 6- bisphosphatase

Microbiology, harmful and benificial microbes

harmful and benificial microbes

Define carcinogenic - dietary factors, Define Carcinogenic - Dietary Factor...

Define Carcinogenic - Dietary Factors? Dietary constituents can also be carcinogenic. But to what extent diet is one of the contributing factors to cancer development is not kn

Physical concepts of plant water relation - osmosis, Physical Concepts of P...

Physical Concepts of Plant Water Relation - Osmosis Osmosis is a special case of diffusion. Here, the movement of water (solvent) takes place from a region of higher c

Determine the long lasting vaccine against common cold, Why doesn't a long ...

Why doesn't a long lasting vaccine against common cold exist yet? Viruses that show a high mutation rate like the virus that causes the common cold escape simply from the actio

Acute complications of diabetes mellitus, Various acute complications of di...

Various acute complications of diabetes mellitus are described in this unit. Acute complications develop within a short period of time. These are due to improper treatment of diabe

Explain about the alitame - artificial sweeteners, Explain about the Alitam...

Explain about the Alitame - artificial sweeteners? Alitame (L-α-aspartyl-N-(2, 2, 4, 4-tetramethyl-3-thietanyl)-D-alaninamide), as illustrated in figure, is a sweetener based o

Define about the carbohydrates, Define about the Carbohydrates? In the ...

Define about the Carbohydrates? In the previous unit we have studied about the energy requirements. You now know that energy must be supplied regularly to individuals through t

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd