Receptor Binding Domains of TcdB from Clostridioides difficile for Chondroitin Sulfate Proteoglycan-4 and Frizzled Proteins Are Functionally Independent and Additive.

Receptor Binding Domains of TcdB from Clostridioides difficile for Chondroitin Sulfate Proteoglycan-4 and Frizzled Proteins Are Functionally Independent and Additive.
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艰难梭菌 TcdB 与硫酸软骨素蛋白聚糖 4 和卷曲蛋白的受体结合域在功能上是独立且相加的。

DOI:
10.3390/toxins12120736
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发表时间:
2020-11-24
期刊:
影响因子:
4.2
通讯作者:
Gerhard R
Gerhard R
中科院分区:
医学2区
文献类型:
--
作者:
Henkel D;Tatge H;Schöttelndreier D;Tao L;Dong M;Gerhard R

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艰难梭菌产生的毒素B(TcdB)是影响结肠粘膜内多种不同细胞类型的主要致病因子。已知TcdB利用卷曲蛋白-1,2,7和硫酸软骨素蛋白聚糖-4(CSPG 4)作为蛋白受体。通过使用人宫颈癌细胞系HeLa CSPG 4敲除(CSPG 4-/-)细胞以及不与CSPG 4或卷曲-1,2,7或两者结合的TcdB突变体,我们评估了单个受体对TcdB细胞病变和细胞毒性效应的影响。我们比较了来自参考菌株VPI 10463(TcdBVPI)和不与frizzled-1,2,7相互作用的地方性菌株R20291(TcdBR 20)的TcdB。缺乏CSPG 4结合的TcdBVPI(TcdBVPI ΔCROP)在HeLa CSPG 4 −/−细胞中显示出与全长TcdB相同的致细胞病变效力,表明在C末端CROP结构域存在的情况下,与卷曲蛋白的相互作用不受影响。我们验证了CSPG 4作为HeLa和HEp-2细胞中TcdB毒素型的细胞受体。通过将单个苯丙氨酸残基1597与丝氨酸交换,我们产生了突变的TcdBVPI变体(TcdBVPI F1597 S),其根据TcdBR 20缺乏与卷曲蛋白-1,2,7的结合,并且在HeLa细胞上显示出与TcdBR 20相同的效力。这使得我们能够估计CSPG 4和卷曲蛋白-1,2,7在TcdB诱导的细胞毒性和细胞病变效应中的各自份额。我们的数据表明,结合卷曲-1,2,7和CSPG 4独立发生,并在一个加性的方式。
Toxin B (TcdB) produced by Clostridioides difficile is a main pathogenicity factor that affects a variety of different cell types within the colonic mucosa. TcdB is known to utilize frizzled-1,2,7 and chondroitin sulfate proteoglycan-4 (CSPG4) as protein receptors. By using human cervical cancer cell line HeLa CSPG4 knockout (CSPG4−/−) cells as well as TcdB mutants which do not bind to either CSPG4 or frizzled-1,2,7, or both, we evaluated the impact of the individual receptors for cytopathic and cytotoxic effects of TcdB. We compared TcdB from the reference strain VPI10463 (TcdBVPI) and the endemic strain R20291 (TcdBR20) which does not interact with frizzled-1,2,7. TcdBVPI devoid of CSPG4 binding (TcdBVPI ΔCROP) shows identical cytopathic potency as full-length TcdB in HeLa CSPG4−/− cells, indicating that interaction with frizzled proteins is not affected in the presence of the C-terminal CROP domain. We validated CSPG4 as cellular receptor for both TcdB toxinotypes in HeLa and HEp-2 cells. By exchange of a single phenylalanine residue, 1597 with serine, we generated a mutated TcdBVPI variant (TcdBVPI F1597S) that in accordance with TcdBR20 lacks binding to frizzled-1,2,7 and showed identical potency as TcdBR20 on HeLa cells. This enabled us to estimate the respective share of CSPG4 and frizzled-1,2,7 in the cytotoxic and cytopathic effect induced by TcdB. Our data reveal that binding to frizzled-1,2,7 and to CSPG4 occurs independently and in an additive manner.
艰难梭菌毒素B对Wnt信号传导抑制的结构洞察力B。
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影响因子: 7.8
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DOI: 10.3390/toxins6072162
发表时间: 2014-07-22
期刊: Toxins
影响因子: 4.2
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