A protein-based pentavalent inhibitor of the cholera toxin B-subunit.

A protein-based pentavalent inhibitor of the cholera toxin B-subunit.
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DOI:
10.1002/anie.201404397
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发表时间:
2014-08-04
影响因子:
16.6
通讯作者:
Turnbull, W. Bruce
Turnbull, W. Bruce
中科院分区:
化学1区
文献类型:
--
作者:
Branson, Thomas R.;McAllister, Tom E.;Garcia-Hartjes, Jaime;Fascione, Martin A.;Ross, James F.;Warriner, Stuart L.;Wennekes, Tom;Zuilhof, Han;Turnbull, W. Bruce

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细菌产生的蛋白质毒素是许多危及生命的肠道疾病的原因。这些毒素中的许多,包括霍乱毒素(CT),通过首先与细胞膜中的糖脂结合进入细胞。抑制这些多价蛋白质/碳水化合物的相互作用将防止毒素进入细胞并引起腹泻。在这里,我们证明了蛋白质支架的位点特异性修饰,其在大小和价态上与靶毒素完全匹配,为有效的多价抑制剂提供了一种方便的途径。所得五价新糖蛋白显示出对CT B亚基(CTB)的抑制效力(IC 50)为104 pm,这是迄今为止报道的针对该靶标的最有效五价抑制剂。 抑制剂和CTB的络合导致蛋白质异源二聚体。这种抑制策略可以潜在地应用于许多多价受体,也为蛋白质组装策略开辟了新的可能性。
Protein toxins produced by bacteria are the cause of many life-threatening diarrheal diseases. Many of these toxins, including cholera toxin (CT), enter the cell by first binding to glycolipids in the cell membrane. Inhibiting these multivalent protein/carbohydrate interactions would prevent the toxin from entering cells and causing diarrhea. Here we demonstrate that the site-specific modification of a protein scaffold, which is perfectly matched in both size and valency to the target toxin, provides a convenient route to an effective multivalent inhibitor. The resulting pentavalent neoglycoprotein displays an inhibition potency (IC50) of 104 pm for the CT B-subunit (CTB), which is the most potent pentavalent inhibitor for this target reported thus far. Complexation of the inhibitor and CTB resulted in a protein heterodimer. This inhibition strategy can potentially be applied to many multivalent receptors and also opens up new possibilities for protein assembly strategies.
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