Elimination of zero-repeat subunit in allergenic seed protein 13S globulin using the novel allele GlbNB2 in common buckwheat (Fagopyrum esculentum Moench)

IF 4.1 Q2 FOOD SCIENCE & TECHNOLOGY Food Chemistry Molecular Sciences Pub Date : 2024-04-22 DOI:10.1016/j.fochms.2024.100205
Takeyuki Okada, Kohtaro Kimura, Naruha Goto, Tomoyuki Katsube-Tanaka
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Abstract

Common buckwheat (Fagopyrum esculentum Moench) seeds contain 13S globulin, the zero-repeat subunit of which is trypsin-resistant and allergenic. Here, its two novel alleles were analyzed for development of hypoallergenic plants. The GlbNC allele has a Miniature Inverted-repeat Transposable Element (MITE)-like insertion in the 4th exon. However, most of the insertion was spliced-out, resulting in accumulation of zero-repeat subunit in GlbNC homozygotes. Meanwhile, the GlbNB2 has a 164-bp insertion in the 3rd exon, resulting in no accumulation of zero-repeat subunit in GlbNB2 homozygotes (NB2_homo). Both the insertion sequences were predicted to form a hairpin-like structure, and that of GlbNB2 was more rigid than that of GlbNC. Trypsin digestion in NB2_homo showed that the α polypeptide of Met-rich subunit is also hard to digest, that is a next target to eliminate for hypoallergenic buckwheat development.

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利用普通荞麦(Fagopyrum esculentum Moench)中的新型等位基因 GlbNB2 消除致敏种子蛋白 13S 球蛋白中的零重复亚基
普通荞麦(Fagopyrum esculentum Moench)种子含有 13S 球蛋白,其零重复亚基具有抗胰蛋白酶和致敏性。在此,对其两个新型等位基因进行了分析,以开发低过敏性植物。GlbNC 等位基因的第 4 个外显子上有一个类似于微型反向重复可转座元件(MITE)的插入。然而,大部分插入片段被剪接掉了,导致零重复亚基在 GlbNC 等位基因中积累。与此同时,GlbNB2 的第 3 个外显子上有一个 164 bp 的插入片段,导致在 GlbNB2 同源型基因(NB2_homo)中没有零重复亚基的积累。据预测,这两个插入序列都会形成发夹状结构,而 GlbNB2 的结构比 GlbNC 的结构更为坚硬。胰蛋白酶消化 NB2_homo 的结果表明,富含 Met 的亚基的 α 多肽也很难被消化,这是开发低过敏性荞麦的下一个目标。
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来源期刊
Food Chemistry Molecular Sciences
Food Chemistry Molecular Sciences Agricultural and Biological Sciences-Food Science
CiteScore
6.00
自引率
0.00%
发文量
83
审稿时长
82 days
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