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首页> 外文期刊>ChemPlusChem >A Self‐Adjuvanting Vaccine Platform: Optimization of Site‐Specific Sortase A Mediated Conjugation of Toll‐Like Receptor 2 Ligands onto the Carboxyl or Amino terminus of Recombinant Protein Antigens
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A Self‐Adjuvanting Vaccine Platform: Optimization of Site‐Specific Sortase A Mediated Conjugation of Toll‐Like Receptor 2 Ligands onto the Carboxyl or Amino terminus of Recombinant Protein Antigens

机译:一个自佐剂疫苗平台:特定于特定的基本分选酶的优化Toll样受体2配体的介导缀合在重组蛋白抗原的羧基或氨基末端上

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Abstract Self‐adjuvanting vaccines, consisting of recombinant protein antigens and covalently attached Toll‐like receptor (TLR) agonists, have the ability to simultaneously and efficiently deliver antigen and TLR adjuvant to antigen presenting cells (APCs). Here, an enzyme‐mediated ligation approach was used to overcome difficulties in producing homogeneous, molecularly defined self‐adjuvanting vaccine products under native conditions. This process was optimized to allow the incorporation of the lipopeptide TLR2 agonist fibroblast‐stimulating lipopeptide (FSL)‐1 onto the N‐ or C‐termini of recombinant protein antigens, employing the enzyme Staphylococcus aureus sortase A (SrtAsa) penta mutant. In addition, because SrtAsa‐mediated ligations are reversible, a tryptophan zipper derived sequence was introduced into both reactants, which was demonstrated to improve ligation efficiency through the formation of a β‐hairpin structure that hinders the reverse reaction. Finally, it was demonstrated that N‐ or C‐terminal conjugation, and the incorporation of the β‐hairpin structure, did not affect the TLR2‐agonist activities of protein antigen TLR agonist conjugates. Overall, this SrtAsa‐mediated ligation platform enabled production of antigen TLR2 agonist conjugates with enhanced ligation efficiency, with the conjugates demonstrating potent TLR2 signaling activation (EC 50 1nM).
机译:摘要自助疫苗疫苗,由重组蛋白抗原和共价连接的Toll样受体(TLR)激动剂组成,具有同时和有效地将抗原和TLR佐剂递送至抗原呈递细胞(APC)。这里,使用酶介导的连接方法来克服天然条件下生产均匀的分子定义的自佐剂疫苗产品的困难。优化该方法以使脂肽TLR2激动剂成纤维细胞刺激脂肽(FSL)-1掺入重组蛋白抗原的N-或C-末端,采用酶金黄色葡萄球菌A(SRTASA)PENTA突变体。此外,由于SRTASA介导的连接是可逆的,将色氨酸拉链衍生的序列引入两个反应物中,所以通过形成阻碍反应的β-发夹结构来改善连接效率。最后,证明了N-或C-末端缀合,以及β-发夹结构的掺入并未影响蛋白质抗原TLR激动剂缀合物的TLR2激动剂活性。总体而言,这种Srtasa介导的连接平台使得能够产生具有增强的连接效率的抗原TLR2激动剂缀合物,其中缀合物证明有效的TLR2信号传导激活(EC 50 <1nm)。

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