concanavalin A

Concanavalin A is a **lectin** (carbohydrate-binding protein) originally extracted from the jack-bean (*Canavalia ensiformis*) and is a member of the legume lectin family. It is a **plant mitogen** that binds specifically to certain structures found in various sugars, glycoproteins, and glycolipids, mainly internal and nonreducing terminal α-D-mannosyl and α-D-glucosyl groups. Structurally, ConA is a **homotetramer** with each subunit (26.5 kDa, 235 amino acids) binding metallic atoms (usually Mn²⁺ and Ca²⁺), with a total molecular weight of 104-112 kDa. ConA has demonstrated **anti-neoplastic properties** through multiple mechanisms including induction of **autophagy and apoptosis** in cancer cells, with P73 and JAK/STAT3 identified as leading players in these pathways. It interacts with diverse receptors containing mannose carbohydrates, including MT1-MMP (the most studied host receptor), rhodopsin, blood group markers, insulin receptors, immunoglobulins, and carcinoembryonic antigen. ConA strongly agglutinates erythrocytes and various cancerous cells, and has shown preferential uptake by hepatic tumor cells over normal hepatocytes. Studies have demonstrated that ConA is sequestered more by hepatic tumor cells and triggers mitochondrial-targeted autophagic cell death after binding to cell membrane glycoproteins. As a **lymphocyte mitogen**, ConA selectively stimulates T-cell subsets, particularly acting on T-lymphocytes by stimulating their energy metabolism. It has immunomodulatory effects through activation of CD8+ T-cells, NK cells, and NK-T cells. However, hepatotoxicity is a significant side effect at high doses (15-20 µg/g), primarily mediated through FasL-mediated apoptosis by NKT cells, while low doses (3-5 µg/g) show anti-inflammatory effects without hepatotoxicity. ConA is widely used in biology and biochemistry for characterizing glycoproteins, purifying glycosylated macromolecules in lectin affinity chromatography, and studying immune regulation. Recent research has identified ConA staining as a **potential biomarker to predict cytarabine sensitivity** in acute myeloid leukemia, with cells expressing higher levels of α-mannose-containing N-glycans showing resistance to cytarabine treatment.

Other names

ConACon A