VPB 112: General Veterinary Biochemistry (1+1)

CONJUGATED PROTEINS

• These are simple proteins conjugated to non- protein substances known as prosthetic group.
• Further classification is based on the nature of the prosthetic group, attached to the simple proteins.

Nucleoproteins	Simple proteins associated with nucleic acids (DNA and RNA). Eg: chromatin of cell.
Glycoproteins	These are proteins having carbohydrates as prosthetic group. Glycoproteins contain less than 4% of carbohydrates whereas mucoproteins contain more than 4% of carbohydrates. Eg: mucin in saliva.
Lipoproteins	These are proteins associated with cholesterol, phospholipids and fatty acids.
Phosphoproteins	Phosphoric acid is the prosthetic group. Eg: casein in milk, vitelline in egg yolk.
Metalloproteins	These proteins are attached to various metal ions such as, copper, cobalt, iron, manganese and zinc. E.g. ceruloplasmin containing copper, carbonic anhydrase containing zinc.
Chromoproteins	Proteins are attached to colored pigments. Eg: hemoglobin, cytochromes and flavoproteins.