Identification and characterisation of seed storage protein transcripts from Lupinus angustifolius
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Background: In legumes, seed storage proteins are important for the developing seedling and are an important source of protein for humans and animals. Lupinus angustifolius (L.), also known as narrow-leaf lupin (NLL) is a grain legume crop that is gaining recognition as a potential human health food as the grain is high in protein and dietary fibre, gluten-free and low in fat and starch.Results: Genes encoding the seed storage proteins of NLL were characterised by sequencing cDNA clones derived from developing seeds. Four families of seed storage proteins were identified and comprised three unique a, seven ß, two ? and four d conglutins. This study added eleven new expressed storage protein genes for the species. A comparison of the deduced amino acid sequences of NLL conglutins with those available for the storage proteins of Lupinus albus (L.), Pisum sativum (L.), Medicago truncatula (L.), Arachis hypogaea (L.) and Glycine max (L.) permitted the analysis of a phylogenetic relationships between proteins and demonstrated, in general, that the strongest conservation occurred within species. In the case of 7S globulin (ß conglutins) and 2S sulphur-rich albumin (d conglutins), the analysis suggests that gene duplication occurred after legume speciation. This contrasted with 11S globulin (a conglutin) and basic 7S (? conglutin) sequences where some of these sequences appear to have diverged prior to speciation. The most abundant NLL conglutin family was ß (56%), followed by a (24%), d (15%) and ? (6%) and the transcript levels of these genes increased 103 to 106 fold during seed development. We used the 16 NLL conglutin sequences identified here to determine that for individuals specifically allergic to lupin, all seven members of the ß conglutin family were potential allergens.Conclusion: This study has characterised 16 seed storage protein genes in NLL including 11 newly-identified members. It has helped lay the foundation for efforts to use molecular breeding approaches to improve lupins, for example by reducing allergens or increasing the expression of specific seed storage protein(s) with desirable nutritional properties.
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Analysis of conglutin seed storage proteins across lupin species using transcriptomic, protein and comparative genomic approachesFoley, R.; Jimenez-Lopez, J.; Kamphuis, L.; Hane, James; Melser, S.; Singh, K. (2015)Background - The major proteins in lupin seeds are conglutins that have primary roles in supplying carbon, sulphur and nitrogen and energy for the germinating seedling. They fall into four families; α, β, γ and δ. Interest ...
Narrow-leafed lupin (Lupinus angustifolius) ß1- and ß6-conglutin proteins exhibit antifungal activity, protecting plants against necrotrophic pathogen induced damage from sclerotinia sclerotiorum and phytophthora nicotianaeJimenez-Lopez, J.; Melser, S.; DeBoer, K.; Thatcher, L.; Kamphuis, Lars; Foley, R.; Singh, Karam (2016)Vicilins (7S globulins) are seed storage proteins and constitute the main protein family in legume seeds, particularly in narrow-leafed lupin (Lupinus angustifolius L.; NLL), where seven vicilin genes, called ß1- to ...
Narrow-leafed lupin (Lupinus angustifolius L.) ß-conglutin proteins modulate the insulin signaling pathway as potential type 2 diabetes treatment and inflammatory-related disease ameliorationLima-Cabello, E.; Alche, V.; Foley, R.; Andrikopoulos, S.; Morahan, G.; Singh, Karam; Alche, J.; Jimenez-Lopez, J. (2017)© 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.Scope: We have investigated the potential use of ß-conglutin protein isoforms from narrow-leafed lupin (Lupinus angustifolius L.) as a diabetes treatment. Methods and ...