Prolamins are a group of plant storage proteins having a high proline amino acid content. They are found in plants, mainly in the seeds of cereal grains such as wheat (gliadin), barley (hordein), rye (secalin), corn (zein), sorghum (kafirin), and oats (avenin). They are characterised by a high glutamine and proline content, and have poor solubility in water. They solubilise best in strong alcohol [70-80%], light acid, and alkaline solutions. The prolamins of the tribe Triticeae, such as wheat gliadin, and related proteins (see Triticeae glutens) are known to trigger coeliac disease, an autoimmune condition, in genetically predisposed individuals.[1]
Maize and sorghum prolamins are sorted by molecular weight into four classes, α, β, γ and δ. Alpha- and delta- prolamins cluster in a broad phylogenetic group (Group 1). The rest cluster into Group 2. Group 1 is widely duplicated in the two plants.[2] A database of Triticeae prolamins (glutens) is available.[3] There does not seem to be an analysis that tries to cluster both sources of prolamins into a grand classification.
References
- ^ Shewry PR, Halford NG. Cereal seed storage proteins: structures, propertin utilization. J Exp Bot 2002;53:947-58. PMID__ 11912237.
- ^ Holding, DR (2014). "Recent advances in the study of prolamin storage protein organization and function". Frontiers in Plant Science. 5: 276. doi:10.3389/fpls.2014.00276. PMC 4064455. PMID 24999346.
- ^ Bromilow, S; Gethings, LA; Buckley, M; Bromley, M; Shewry, PR; Langridge, JI; Clare Mills, EN (23 June 2017). "A curated gluten protein sequence database to support development of proteomics methods for determination of gluten in gluten-free foods". Journal of Proteomics. 163: 67–75. doi:10.1016/j.jprot.2017.03.026. PMC 5479479. PMID 28385663.
External links
- Pfam clan Prolamin - a group of prolamin N-terminal domains with similar disulfide-bonding patterns