2S albumin seed storage protein (2S albumin)

2S albumins are a major family of seed storage proteins widely distributed in dicotyledonous plants, including legumes, tree nuts, and oilseeds [1]. Characterized by their small molecular weight (approximately 10-15 kDa) and a conserved motif of eight cysteine residues forming four stabilizing disulfide bonds, these proteins are remarkably resistant to thermal denaturation and proteolytic digestion [1,2]. Biologically, they serve as essential reservoirs of nitrogen and sulfur that are mobilized by the plant embryo during the germination process [2]. In clinical medicine, 2S albumins are primarily significant as potent food allergens; they are frequently identified as 'major' allergens because they are recognized by IgE antibodies in a high percentage of allergic individuals and often correlate with severe systemic reactions and anaphylaxis [3]. While they do not serve as traditional therapeutic targets for enzymatic inhibition or receptor modulation, they are the primary focus of component-resolved diagnostics (CRD) and are the active components in allergen-specific immunotherapy (AIT) products, such as Palforzia, which aims to induce oral tolerance in patients with peanut allergy [4]. Sources: [1] Moreno and Clemente (2008) PMID: 18435102; [2] Shewry et al. (1995) PMID: 7712111; [3] Hauser et al. (2008) PMID: 18312571; [4] FDA Palforzia Prescribing Information (2020).

Other names

Napin-like protein2S seed storage proteinConglutin-deltaSmall neutral-to-basic seed storage protein

Induction of oral tolerance and immunological desensitization through controlled, escalating exposure to the allergen, leading to increased IgG4 levels and reduced IgE-mediated mast cell activation.