Peanut agglutinin

Peanut Agglutinin complexed with Gal-a-1,3-Gal. PDB entry 2dvd

Peanut agglutinin (PNA) is a lectin found in peanuts (Arachis hypogaea). It is a carbohydrate-binding protein that has a high affinity for the disaccharide galactose-β(1-3)-N-acetylgalactosamine (Gal-β(1-3)-GalNAc). PNA is widely used in biochemistry and cell biology for its ability to bind specifically to certain carbohydrate structures.

Structure and Function

PNA is a tetrameric protein, meaning it consists of four subunits. Each subunit has a binding site for the specific carbohydrate structure. The binding of PNA to its carbohydrate ligand is highly specific and is used to identify and isolate glycoproteins and glycolipids that contain the Gal-β(1-3)-GalNAc structure.

Applications

PNA is commonly used in histochemistry and cytochemistry to detect specific glycoproteins on the surface of cells. It is also used in immunology to study the glycosylation patterns of antibodies and other immune molecules. In cancer research, PNA is used to identify changes in glycosylation that occur in tumor cells.

Histochemistry

In histochemistry, PNA is used as a staining reagent to detect specific carbohydrate structures in tissue sections. It is often conjugated to a fluorophore or an enzyme to visualize the binding sites.

Cytochemistry

In cytochemistry, PNA is used to study the distribution of glycoproteins on the surface of cells. It can be used in flow cytometry and immunofluorescence microscopy to analyze cell surface glycosylation.

Immunology

In immunology, PNA is used to study the glycosylation of antibodies and other immune molecules. It can be used to isolate specific glycoforms of antibodies for further analysis.

Cancer Research

In cancer research, PNA is used to identify changes in glycosylation that occur in tumor cells. These changes can be used as biomarkers for the diagnosis and prognosis of certain types of cancer.

See Also

• Lectin
• Glycoprotein
• Glycolipid
• Histochemistry
• Cytochemistry
• Immunology
• Cancer research

External Links

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