Definition

Noun A glycoprotein is a type of protein that has carbohydrate (sugar) molecules attached to it. This combination is a crucial structural and functional component in many biological processes.

Usage

The term "glycoprotein" is used in biochemistry, cell biology, and medicine to describe proteins modified with sugar chains. These modifications can affect the protein's stability, function, and location within an organism.

Examples

• Antibodies, which are essential for the immune system, are glycoproteins.
• The spike protein on the surface of the SARS-CoV-2 virus is a glycoprotein.
• Many hormones and cell membrane receptors are glycoproteins.

Advanced Usage

• N-linked glycoprotein: A glycoprotein where the carbohydrate chain is attached to the nitrogen atom of an asparagine amino acid in the protein.
• O-linked glycoprotein: A glycoprotein where the carbohydrate chain is attached to the oxygen atom of a serine or threonine amino acid.

Variants and Related Words

• Glycosylation (n): The enzymatic process of attaching carbohydrate groups to a protein to form a glycoprotein.
• Proteoglycan (n): A specific type of glycoprotein where the carbohydrate component is much larger and is a glycosaminoglycan.

Synonyms

• Conjugated protein (this is a broader category that includes glycoproteins and other protein complexes).

Antonyms

• Simple protein (a protein that yields only amino acids upon hydrolysis, with no other major chemical components).

Noun

1. a conjugated protein having a carbohydrate component