Types and Functions of Proteins, Biology tutorial


We are familiar that proteins comprise most of the cells, thus proteins are building blocks. Proteins are extremely significant molecules in the cells of our body. They are engaged in virtually all cell functions. Each and every protein in the body consists of a particular function. A few proteins are engaged in structural support; others are engaged in bodily movement, or in protection against germs.

Protein Composition:

As we are familiar that proteins are organic macromolecules build up of linear chains of amino acids. Though, while a protein's fundamental structure is a linear amino acid chain, the final structure of a protein is not linear. Rather, the protein's amino acid series and the chemical and physical properties of the amino acids of the whole protein molecule affect how it folds into a three dimensional shape. 

The amino acid series of a protein is determined by the base pair series in the gene which codes for the protein.

Illustrations of Protein and their Functions:

1) Antibodies:

Antibodies (as well termed as immunoglobulin) are specialized proteins engaged in defending the body from antigens (that is, foreign invaders). One way antibodies demolish antigens is by immobilizing them in such a way that they can be damaged by white blood cells. Antibodies are present in the blood serum, tissue fluids and mucosal surfaces of the vertebrate animal.

2) Contractile Proteins:

Contractile proteins are accountable for movement. Illustrations comprise actin and myosin. Such proteins are comprised in muscle contraction and movement. 

3) Hormonal Proteins:

Hormonal proteins are messenger proteins that assist to coordinate certain bodily activities. Illustrations comprise insulin, oxytocin, and somatotropin. Insulin regulates glucose metabolism through controlling the blood-sugar concentration. Oxytocin stimulates contractions in women all through childbirth. Somatotropin is a growth hormone which stimulates protein production in the muscle cells. 

4) Structural Proteins:

Such proteins are less 'active' than such engaged in catalyzing reactions or those signaling cells, and transporting molecules, however are no less significant. They confer strength and stiffness to biological components which would or else be not capable to support themselves. They tend to encompass very particular shapes. They are long, thin fibers or other shapes which, if allowed to form polymers, give strength and support. They are necessary components of cartilage, collagen, nails and hair, feathers, hooves and other such structure. 

They are as well necessary components of muscles and are essential to produce the force that lets muscles to contract and move. They are fibrous and stringy and give support. Illustrations comprise keratin, collagen and elastin. Keratins make stronger protective coverings like hair, feathers, quills, horns and beaks. Collagens and elastin give support for connective tissues like ligaments and tendons.

5) Storage Proteins:

Storage proteins store the amino acids. Illustrations comprise ovalbumin and casein. Ovalbumin is found in egg whites and casein is a milk-based protein.

6) Transport Proteins:

Proteins are as well involved in the molecular transport of cells. Transport proteins are carrier proteins that move molecules from one place to the other around the body. Illustrations comprise haemoglobin and cytochromes.  Haemoglobin transports oxygen via the blood. Hemoglobin binds iron molecules and transports them in the blood from the lungs to organs and tissues all through the body. Cytochromes operate in the electron transport chain as electron carrier proteins. 

7) Enzymes:

The function of proteins as enzymes is possibly their best acknowledged function. Enzymes are proteins which facilitate biochemical reactions. They are often termed to as organic catalysts as they speed up the chemical reactions. Illustrations comprise lactase and pepsin. Lactase breaks down the sugar lactose found in the milk. Pepsin is a digestive enzyme which works in the stomach to break down proteins in food. The enzyme, though, is itself unchanged at the end of the reaction. Enzymes are accountable for catalyzing reactions in processes like metabolism, DNA replication and food digestion. However, enzymes are identified to be involved in some 4,000 bodily reactions.

Enzyme Reaction and Denaturation:

The four steps of an Enzyme Reaction and Denaturation are as follows:

1) An enzyme and a substrate are in the similar area. The substrate is the biological molecule which the enzyme attacks. 

2) The enzyme gets to the substrate having its own special area termed as the active site. The active site is a particularly shaped area of the enzyme which fits around the substrate. The active site is the keyhole of the lock. 

3) A procedure termed as catalysis occurs. Catalysis is when the substrate is changed. It could be broken down or joined with the other molecule to make somewhat new. The substrate is no longer similar. The substrate is now termed as the product.

4) The enzyme reverts to its former state and it is ready to perform another reaction.

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