Monshi FI, Katsube-Tanaka T. 2S albumin g13 polypeptide, less related to Fag e 2, can be eliminated in common buckwheat (Fagopyrum esculentum Moench) seeds.
FOOD CHEMISTRY: MOLECULAR SCIENCES 2022;
5:100138. [PMID:
36187231 PMCID:
PMC9523277 DOI:
10.1016/j.fochms.2022.100138]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/14/2022] [Revised: 09/22/2022] [Accepted: 09/24/2022] [Indexed: 11/06/2022]
Abstract
2S albumin (g11, g13, g14, and g28) is an important allergen in common buckwheat.
g13 is hydrophobic, scarce, and less related to g14 than g11/g28 is related to g14.
g13_null allele homozygote produced no g13 protein in seeds.
Insert-like sequence of g13_null allele resided frequently in buckwheat genome.
g13_null homozygote lowered allergenicity in common buckwheat.
2S albumin (g11, g13, g14, and g28) is an important allergen in common buckwheat (Fagopyrum esculentum). g13 is hydrophobic, rare in seeds, and may show distinct allergenicity from the others; therefore, we tried to eliminate this protein. Phylogenetic and property distance analyses indicated g13 is less related to g14 (Fag e 2) than g11/g28 is related to g14, particularly in the second domain containing the II and III α-helices. A null allele with a 531 bp insertion in the coding region was found for g13 at an allele frequency of 2 % in natural populations of common buckwheat. The g13_null allele homozygote accumulated no g13 protein. A BLAST search for the 531 bp insertion suggested the insert-like sequence resided frequently in the buckwheat genome, including the self-incompatibility responsible gene ELF3 in Fagopyrum tataricum. The g13_null insert-like sequence could, therefore, help in producing hypoallergenic cultivars, and expand the genetic diversity of buckwheat.
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