Difference Between Globular Protein and Fibrous Protein

Chemical nutrients which are essential for building tissues in the body are called proteins. They are also responsible for the repair of worn out cells.

Globular Protein vs Fibrous Protein

The difference between globular proteins and fibrous proteins is that globular proteins are mainly used to form cellular messengers, amino acids, enzymes whereas fibrous proteins are mainly used in the formation of tendons, connective tissues, and fibers.

Globular Protein vs Fibrous Protein

Also, the structure of both these proteins is very different from each other. The shape of a globular protein is a sphere while the shape of a fibrous protein is like an elongated strand.

On the other hand, fibrous proteins are not at all soluble in water, weak bases, or weak acids. They are only soluble strong acids. In general, the fibrous protein is present in the form of wires and rods.

Comparison Table

Parameters of ComparisonGlobular ProteinsFibrous Proteins
DefinitionGlobular protein is a type of protein that is soluble and tends to be involved in metabolic functions.Fibrous proteins are a type of proteins that are insoluble and that build up the main structural elements of the body.
Shape and structureGlobular proteins are round or spherical in shape and have a folded ball like structure.Fibrous proteins are long and narrow in shape and have a helical or sheet like structure.
Solubility in different solventsGlobular proteins are soluble in water, acids and bases.Fibrous proteins are only soluble in strong acids. They are insoluble in water, and any other weak acids and bases.
Intermolecular forcesGlobular proteins have a weak intermolecular interaction between them.Fibrous proteins have a strong intermolecular interaction between them.
FunctionGlobular proteins are mainly responsible for the formation of cellular messengers, amino acids and enzymes.Fibrous proteins are mainly responsible for the formation of tough tissues. They are used in the formation of tendons, connective tissues and fibers.

What is Globular Protein?

Globular proteins are spherical proteins and are water soluble. Globular proteins are responsible for the formation of many essential structures in the human body.

They perform all the regulatory roles in the body. The globular proteins are held together by weak intermolecular hydrogen bonding. 

They are made up of primary, secondary, tertiary, and sometimes also quaternary structures. They consist of straight-chain structure of secondary structures that can join polypeptide chains and can also change directions.

globular protein

What is Fibrous Protein?

Fibrous proteins are also known as scleroproteins. They are in the shape of elongated strands like rods and wires, of polypeptide chain which results in the formation of it’s sheet like structure.

They mainly form tendons, connective tissues and fibres. In fibrous proteins, the peptide chains are held together by very strong intermolecular hydrogen bonding. 

Also, fibrous proteins do not de-nature easily. They are made up of single units or a unit which is repeated many times.

fibrous protein

Main Differences Between Globular Proteins and Fibrous Proteins

  1. Globular protein is a type of protein that is soluble and tends to be involved in metabolic functions whereas Fibrous proteins are a type of proteins that are insoluble and that helps in building up the main structural elements of the body.
  2. Globular proteins are soluble in water, acids and bases while Fibrous proteins are only soluble in strong acids. 

References

  1. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1063354/
  2. https://pubs.acs.org/doi/pdf/10.1021/ja01252a512
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