Structural analysis of P. falciparum KAHRP and PfEMP1 complexes with host erythrocyte spectrin suggests a model for cytoadherent knob protrusions.
Structural analysis of P. falciparum KAHRP and PfEMP1 complexes with host erythrocyte spectrin suggests a model for cytoadherent knob protrusions.
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恶性疟原虫KAHRP和PFEMP1复合物与宿主红细胞光谱蛋白的结构分析提出了一个细胞辅助旋钮突起的模型。
DOI:
10.1371/journal.ppat.1006552
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发表时间:
2017-08
期刊:
影响因子:
6.7
通讯作者:
Vakonakis I
中科院分区:
文献类型:
--
作者:
Cutts EE;Laasch N;Reiter DM;Trenker R;Slater LM;Stansfeld PJ;Vakonakis I
Plasmodium falciparum Erythrocyte Membrane Protein 1 (PfEMP1) and Knob-associated Histidine-rich Protein (KAHRP) are directly linked to malaria pathology. PfEMP1 and KAHRP cluster on protrusions (knobs) on the P. falciparum-infected erythrocyte surface and enable pathogenic cytoadherence of infected erythrocytes to the host microvasculature, leading to restricted blood flow, oxygen deprivation and damage of tissues. Here we characterize the interactions of PfEMP1 and KAHRP with host erythrocyte spectrin using biophysical, structural and computational approaches. These interactions assist knob formation and, thus, promote cytoadherence. We show that the folded core of the PfEMP1 cytosolic domain interacts broadly with erythrocyte spectrin but shows weak, residue-specific preference for domain 17 of α spectrin, which is proximal to the erythrocyte cytoskeletal junction. In contrast, a protein sequence repeat region in KAHRP preferentially associates with domains 10–14 of β spectrin, proximal to the spectrin–ankyrin complex. Structural models of PfEMP1 and KAHRP with spectrin combined with previous microscopy and protein interaction data suggest a model for knob architecture. Formation of cytoadherent knobs on the surface of P. falciparum infected erythrocytes correlates with malaria pathology. Two parasite proteins central for knob formation and cytoadherence, KAHRP and PfEMP1, have previously been shown to bind the erythrocyte cytoskeleton. Both KAHRP and PfEMP1 include large segments of protein disorder, which have previously hampered their analysis. In this study we use biophysics and structural biology tools to analyze the interactions between these proteins and host spectrin. We devise a novel computational tool to help us towards this goal that may be broadly applicable to characterizing other complexes of widespread, disordered Plasmodial proteins and host components. We derive atomistic models of KAHRP–spectrin and PfEMP1 –spectrin complexes, and integrate these into an emerging model of knob architecture.
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影响因子:
6.7
作者:
Heiber A;Kruse F;Pick C;Grüring C;Flemming S;Oberli A;Schoeler H;Retzlaff S;Mesén-Ramírez P;Hiss JA;Kadekoppala M;Hecht L;Holder AA;Gilberger TW;Spielmann T
通讯作者:
Spielmann T
影响因子:
64.5
作者:
BARUCH, DI;PASLOSKE, BL;HOWARD, RJ
通讯作者:
HOWARD, RJ
DOI:
10.1107/s0907444904016427
发表时间:
2004-12-01
影响因子:
2.2
作者:
Blanc, E;Roversi, P;Bricogne, G
通讯作者:
Bricogne, G
DOI:
10.1002/prot.340230412
发表时间:
1995-12-01
期刊:
PROTEINS-STRUCTURE FUNCTION AND GENETICS
影响因子:
--
作者:
Frishman, D;Argos, P
通讯作者:
Argos, P
影响因子:
2
作者:
Fankhauser N;Nguyen-Ha TM;Adler J;Mäser P
通讯作者:
Mäser P