Page 148 - MNU microbiology theoritical 2025

General Microbiology & Immunology (PM 401) Second level Semester 4 2024/2025

c) Protects mucous membranes by neutralizing viruses and toxins, immobilizing

motile organisms and preventing attachment of microbes to cell surfaces.

.

4- IgD

1. Structure - IgD exists only as a monomer.

2. Properties :

a) IgD is found in low levels in serum, its role in serum uncertain.

b) It is involved with the development and maturation of the antibody

response5.

5- IgE

1. Structure - IgE exists as a monomer

2. Properties

a) IgE is the least common serum Ig.

b) Found bound via the Fc region to basophils and mast cells, rather than

being free in circulation

c) IgE also plays a role

➢ allergic reactions because of its binding to basophils and mast cells.

➢ Fighting parasitic helminth diseases as eosinophils bind to IgE-coated
helminths results in killing of the parasite.

General Microbiology & Immunology (PM 401) theoretical handbook Page 137