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Question

What is the function of secretory protein in IgA


A

Helps in the secretion of IgA as a dimer

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B

Helps in the secretion of monomeric IgA

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C

Helps the IgA to bind to pathogens in saliva

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D

Helps in its secretion as a serum immunoglobulin

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Solution

The correct option is A

Helps in the secretion of IgA as a dimer


IgA is the predominant immunoglobulin in bodily secretions such as breast milk, saliva, tears and mucus. In serum IgA exists predominantly as a monomer, but the ‘secretory IgA’, that is the IgA in breast milk and other fluids is a dimer (H2L2)2, connected by a secretory protein that enables its secretion.


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