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Acquired Immunity: Antibodies
Concepts tested here
- Chemical nature of antibodies
All Questions
2006 AIPMT-PRE 1 question
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Antibodies in our body are complex -Antibodies are proteins produced by B-lymphocytes in response to pathogens; they are called immunoglobulins (Ig).
Each antibody molecule has four peptide chains, two small light chains and two longer heavy chains, so it is represented as $H_2L_2$.
The protein chains have carbohydrate (oligosaccharide) groups attached to them, so chemically antibodies are glycoproteins.
They belong to the $\gamma$-globulin fraction of the blood plasma, and there are five classes: IgA, IgM, IgE, IgG and IgD.
They are not lipoproteins, steroids or prostaglandins.
So antibodies are complex glycoproteins.