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Diverse Antibody Responses to Conserved Structural Motifs in Plasmodium falciparum Circumsporozoite Protein.
Journal of Molecular Biology ( IF 4.7 ) Pub Date : 2019-12-26 , DOI: 10.1016/j.jmb.2019.12.029
Tossapol Pholcharee 1 , David Oyen 1 , Jonathan L Torres 1 , Yevel Flores-Garcia 2 , Gregory M Martin 1 , Gonzalo E González-Páez 1 , Daniel Emerling 3 , Wayne Volkmuth 3 , Emily Locke 4 , C Richter King 4 , Fidel Zavala 2 , Andrew B Ward 1 , Ian A Wilson 5
Affiliation  

Malaria vaccine candidate RTS,S/AS01 is based on the central and C-terminal regions of the circumsporozoite protein (CSP) of P. falciparum. mAb397 was isolated from a volunteer in an RTS,S/AS01 clinical trial, and it protects mice from infection by malaria sporozoites. However, mAb397 originates from the less commonly used VH3-15 germline gene compared to the VH3-30/33 antibodies generally elicited by RTS,S to the central NANP repeat region of CSP. The crystal structure of mAb397 with an NPNA4 peptide shows that the central NPNA forms a type I β-turn and is the main recognition motif. In most anti-NANP antibodies studied to date, a germline-encoded Trp is used to engage the Pro in NPNA β-turns, but here the Trp interacts with the first Asn. This "conserved" Trp, however, can arise from different germline genes and be located in the heavy or the light chain. Variation in the terminal ψ angles of the NPNA β-turns results in different dispositions of the subsequent NPNA and, hence, different stoichiometries and modes of antibody binding to rsCSP. Diverse protective antibodies against NANP repeats are therefore not limited to a single germline gene response or mode of binding.

中文翻译:

恶性疟原虫环子孢子蛋白中保守结构基序的多种抗体反应。

候选疟疾疫苗RTS,S / AS01基于恶性疟原虫环子孢子蛋白(CSP)的中央和C端区域。在RTS,S / AS01临床试验中从一名志愿者中分离出mAb397,它可保护小鼠免受疟疾子孢子的感染。但是,与通常由RTS,S引发的CSP中央NANP重复区域产生的VH3-30 / 33抗体相比,mAb397源自较少使用的VH3-15种系基因。具有NPNA4肽的mAb397的晶体结构表明,中央NPNA形成I型β-转角,是主要的识别基序。迄今为止,在大多数研究的抗NANP抗体中,使用种系编码的Trp使Pro参与NPNAβ-turns,但此处Trp与第一个Asn相互作用。但是,这种“保守的”色氨酸 它们可以来自不同的种系基因,并且位于重链或轻链中。NPNAβ圈末端ψ角的变化导致后续NPNA的位置不同,因此抗体与rsCSP结合的化学计量和模式也不同。因此,针对NANP重复的多种保护性抗体不限于单一种系基因应答或结合方式。
更新日期:2019-12-27
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