Structure of the DBL3x domain of pregnancy-associated malaria protein VAR2CSA complexed with chondroitin sulfate A.

Structure of the DBL3x domain of pregnancy-associated malaria protein VAR2CSA complexed with chondroitin sulfate A.
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DOI:
10.1038/nsmb.1479
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发表时间:
2008-09
影响因子:
16.8
通讯作者:
--
中科院分区:
生物学1区
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--
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恶性疟原虫感染的红细胞通过VAR 2CSA蛋白(恶性疟原虫红细胞膜蛋白-1家族的成员)与胎盘中的硫酸软骨素A(CSA)结合,导致孕妇患上危及生命的疟疾,对其胎儿和新生儿产生严重影响。在这里,我们描述了CSA结合DBL 3x结构域的结构,这是VAR 2CSA的Duffy结合样(DBL)结构域。通过与CSA寡糖形成DBL 3x复合物并确定其结构,我们已经确定CSA结合位点是亚结构域2和亚结构域3上的保守的带正电荷的残基簇。突变或化学修饰的赖氨酸残基的网站显着减少CSA结合DBL 3x。CSA结合位点的定位是对妊娠相关疟疾的分子理解的重要一步,并为疫苗开发提供了新的靶点。
Plasmodium falciparum–infected erythrocytes bind to chondroitin sulfate A (CSA) in the placenta via the VAR2CSA protein, a member of the P. falciparum erythrocyte membrane protein-1 family, leading to life-threatening malaria in pregnant women with severe effects on their fetuses and newborns. Here we describe the structure of the CSA binding DBL3x domain, a Duffy binding-like (DBL) domain of VAR2CSA. By forming a complex of DBL3x with CSA oligosaccharides and determining its structure, we have identified the CSA binding site to be a cluster of conserved positively charged residues on subdomain 2 and subdomain 3. Mutation or chemical modification of lysine residues at the site markedly diminished CSA binding to DBL3x. The location of the CSA binding site is an important step forward in the molecular understanding of pregnancy-associated malaria and offers a new target for vaccine development.
DOI: 10.1016/j.molbiopara.2007.05.010
发表时间: 2007-09-01
影响因子: 1.5
作者:
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