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

Human embryo, Human embryo: After fertilization the human embryo divide...

Human embryo: After fertilization the human embryo divides mitotically and develops two membranes: 1) Chorion 2) Amnion Functions of the membranes: i) Chorion : It

Ganong''s potometer, What happens to the movement of the air bubble if the ...

What happens to the movement of the air bubble if the apparatus is kept in i. In the dark ii. In sunlight iii.In front of a fan

Laboratory tests - evaluation of heart failure, Routine blood tests like ha...

Routine blood tests like haemoglobin, creatinine, electrolytes are useful to plan treatment. More recently the blood natriuretic peptide levels have been used to assess heart failu

Why ups is so important to health practitioners, Give a short explanation o...

Give a short explanation of what UPS really means and why it is so important to health practitioners and consumers/patients.

Define the sarcoplasmic reticulum membranes, An increase in the calcium con...

An increase in the calcium conductance of all sarcoplasmic reticulum membranes of a skeletal muscle with no external forces on it leads to A. increased binding of calcium ions

What is the function of a control group in an experiment, What is the funct...

What is the function of a control group in an experiment? The function of a control group in an experiment is to be a stable to account for any effects a given environment has

Domestication and cultivation of ornamental plants, As with food crops, the...

As with food crops, the "discovery, domestication and cultivation" of ornamental plants have a long history. There is  indication that lilies were cultivated in China for both medi

What is a community, What is a community? What is the difference between th...

What is a community? What is the difference between the concepts of community and population? A community is a set of populations of living beings that live in the similar regi

Establishment of suspension cultures, Establishment of Suspension Cultures ...

Establishment of Suspension Cultures A callus crumbles into smaller clumps and single cells in liquid medium by gentle agitation (100-120 rPM) on a shaker. Shaking the cultur

Herbage area or vegetation cover, Herbage area or vegetation cover Her...

Herbage area or vegetation cover Herbage area or vegetation cover is an important aspect of vegetation study in understanding the nature of a community particularly in evaluat

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