补体受体 1 是人类红细胞的红细胞结合蛋白受体。

Complement receptor 1 is the human erythrocyte receptor for erythrocyte binding protein.

机构信息

Laboratory of Malaria and Vector Research, National Institute of Allergy and Infectious Diseases, NIH, Rockville, MD 20852.

Department of Biology, Hull York Medical School, York Biomedical Research Institute, University of York, York YO10 5DD, United Kingdom.

出版信息

Proc Natl Acad Sci U S A. 2024 Jan 30;121(5):e2316304121. doi: 10.1073/pnas.2316304121. Epub 2024 Jan 23.

Abstract

The discovery that Africans were resistant to infection by () led to the conclusion that invasion relied on the Duffy Binding Protein (PvDBP) interacting with the Duffy Antigen Receptor for Chemokines (DARC) expressed on erythrocytes. However, the recent reporting of infections in DARC-negative Africans suggests that the parasite might use an alternate invasion pathway to infect DARC-negative reticulocytes. To identify the parasite ligands and erythrocyte receptors that enable invasion of both DARC-positive and -negative erythrocytes, we expressed region II containing the Duffy Binding-Like (DBL) domain of erythrocyte binding protein (PvEBP-RII) and verified that the DBL domain binds to both DARC-positive and -negative erythrocytes. Furthermore, an AVidity-based EXtracelluar Interaction Screening (AVEXIS) was used to identify the receptor for PvEBP among over 750 human cell surface receptor proteins, and this approach identified only Complement Receptor 1 (CR1, CD35, or C3b/C4b receptor) as a PvEBP receptor. CR1 is a well-known receptor for Reticulocyte binding protein Homology 4 (PfRh4) and is present on the surfaces of both reticulocytes and normocytes, but its expression decreases as erythrocytes age. Indeed, PvEBP-RII bound to a subpopulation of both reticulocytes and normocytes, and this binding was blocked by the addition of soluble CR1 recombinant protein, indicating that CR1 is the receptor of PvEBP. In addition, we found that the Long Homology Repeat A (LHR-A) subdomain of CR1 is the only subdomain responsible for mediating the interaction with PvEBP-RII.

摘要

该发现表明,非洲人对感染()具有抗性,这导致了以下结论:入侵依赖于 Duffy 结合蛋白(PvDBP)与红细胞上表达的趋化因子 Duffy 抗原受体(DARC)相互作用。然而,最近有报道称,DARC 阴性的非洲人也感染了疟原虫,这表明寄生虫可能利用另一种入侵途径来感染 DARC 阴性的网织红细胞。为了确定使疟原虫能够入侵 DARC 阳性和阴性红细胞的寄生虫配体和红细胞受体,我们表达了含有红细胞结合蛋白(PvEBP-RII)的 Duffy 结合样(DBL)结构域的区域 II,并证实 DBL 结构域与 DARC 阳性和阴性红细胞均结合。此外,我们还使用基于亲和力的细胞外相互作用筛选(AVEXIS)来鉴定 PvEBP 的受体,其中包含超过 750 个人类细胞表面受体蛋白,这种方法仅鉴定出补体受体 1(CR1,CD35 或 C3b/C4b 受体)为 PvEBP 受体。CR1 是已知的网状细胞结合蛋白同源物 4(PfRh4)的受体,存在于网织红细胞和正常红细胞的表面,但随着红细胞的衰老,其表达量下降。事实上,PvEBP-RII 与网织红细胞和正常红细胞的亚群结合,并且这种结合被添加可溶性 CR1 重组蛋白所阻断,表明 CR1 是 PvEBP 的受体。此外,我们发现 CR1 的长同源重复 A(LHR-A)亚结构域是唯一介导与 PvEBP-RII 相互作用的亚结构域。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/149c/10835065/94fee6188ce1/pnas.2316304121fig01.jpg

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