牛乳α-乳白蛋白IgE線(xiàn)性表位的關(guān)鍵氨基酸識(shí)別
發(fā)布時(shí)間:2018-05-02 12:05
本文選題:牛乳過(guò)敏 + α-乳白蛋白; 參考:《食品科學(xué)》2017年11期
【摘要】:α-乳白蛋白是引起牛乳過(guò)敏的主要過(guò)敏原之一。識(shí)別α-乳白蛋白作用表位及影響致敏性的關(guān)鍵氨基酸,對(duì)于揭示α-乳白蛋白致敏機(jī)理及低致敏乳制品的開(kāi)發(fā)具有重要的意義。本研究采用固相合成技術(shù)合成α-乳白蛋白系列多肽,以牛乳過(guò)敏患者血清為探針,通過(guò)酶聯(lián)免疫吸附分析法識(shí)別α-乳白蛋白的作用表位和關(guān)鍵氨基酸。結(jié)果表明:免疫球蛋白(immunoglobulins,Ig)E作用表位的氨基酸序列定位為aa1-15、aa6-20、aa46-60、aa71-85和aa101-115。α-乳白蛋白IgE作用表位關(guān)鍵氨基酸為第8位的纈氨酸、第9位的苯丙氨酸、第10位的精氨酸、第103位的酪氨酸、第105位的亮氨酸和第107位組氨酸。本研究可以為過(guò)敏原c DNA克隆以激活T細(xì)胞、降低IgE結(jié)合能力提供重要思路。
[Abstract]:偽-lactoalbumin is one of the main allergens causing milk allergy. The recognition of 偽 -lactoalbumin epitopes and the key amino acids affecting the sensitization of 偽 -lactoalbumin are of great significance in revealing the mechanism of 偽 -lactoalbumin sensitization and the development of low-sensitized dairy products. In this study, a series of peptides of 偽 -lactoalbumin were synthesized by solid phase synthesis. The serum of suckling allergic patients was used as probe to identify the binding epitopes and key amino acids of 偽 -lactalbumin by enzyme-linked immunosorbent assay (Elisa). The results showed that the amino acid sequence of IgE epitope of immunoglobulins was aa1-15A6-20A46-60 A71-85 and a101-115. the key amino acids of 偽 -lactoalbumin IgE epitope were valine in eighth position, phenylalanine in ninth position, arginine in 10th position, tyrosine in 103rd position. Leucine at 105 and histidine at 107. This study can provide important ideas for allergy c DNA cloning to activate T cells and reduce the binding ability of IgE.
【作者單位】: 北京工商大學(xué)食品學(xué)院食品添加劑與配料北京高校工程研究中心;北京友誼醫(yī)院皮膚科;
【基金】:國(guó)家自然科學(xué)基金青年科學(xué)基金項(xiàng)目(31101236) 北京市自然科學(xué)基金面上項(xiàng)目(6132004) 北京市科技新星計(jì)劃項(xiàng)目(Z131102000413005)
【分類(lèi)號(hào)】:Q503;R725.9
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