Classification of protein based on shape, Biology

Protein Classification Based on Shape

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


  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.


  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.


  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.
Posted Date: 10/9/2012 5:57:04 AM | Location : United States

Related Discussions:- Classification of protein based on shape, Assignment Help, Ask Question on Classification of protein based on shape, Get Answer, Expert's Help, Classification of protein based on shape Discussions

Write discussion on Classification of protein based on shape
Your posts are moderated
Related Questions
Q. How do sponges try to protect themselves against harm from the environment? Is that method rudimentary or efficient? Sponges can close their pores to avoid the entrance of w

Techniques :  Depending on the type of surgery planned, the heart may be approached through median sternotomy, left or right thoracotomy. The problems encountered could be due to

Fatty  acids  are  synthesized  in  the  cytosol,  but  acetyl  CoA  is  produce  from pyruvate in the mitochondria. Therefore the acetyl CoA must be transferred  from  the mitocho

Define Advantage & disadvantage of using Algae as source of protein? Advantage Produces proteins which have almost all the Essential Amino acids. Rich in tyrosine

REASON'S FOR MENDEL'S SUCCESS 1.         Mendel selected only pure breeding varieties of pea ( Pisum sativum ) for his experiments. 2.         Mendel took only those traits

The trp (tryptophan) operon which is shown in the figure will have  five  structural  genes  encoding enzymes  for tryptophan  biosynthesis  with an upstream  Ptrp  (trp promoter)

Explain what is Patent Ductus Arteriosus in details? Figure : Anatomical location of PDA Patent Ductus Arteriosus (PDA) may be an isolated defect or may co-exist with

Lentic Ecosystems Lakes are inland, depressions containing standing water. They vary considerably in area and depth. The largest lake in the world, the lake Superior in North

Define Protein requirements of infants? Protein allowances of infants should meet both growth and maintenance requirements. Protein allowances are computed from the protein con

Monomeric enzymes Monomeric enzymes are those which consist of only a single polypeptide chain, so they cannot be dissociated into smaller units. Very few monomeric enzymes are