Tryptophan-rich domains of Plasmodium falciparum SURFIN4.2and Plasmodium vivax PvSTP2 interact with membrane skeleton of red blood cell.
Plasmodium falciparum dramatically alters the morphology and properties of the infected red blood cells (iRBCs). A large group of exported proteins participate in these parasite-host interactions occurring at the iRBC membrane skeleton. SURFIN4.2is one of iRBC surface protein that belongs to surface-associated interspersed protein (SURFIN) family. Although the intracellular tryptophan-rich domain (WRD) was proposed to be important for the translocation of SURFINs from Maurer's clefts to iRBC surface, the molecular basis of this observation has yet to be defined. The WRDs of P. falciparum SURFIN proteins and their orthologous Plasmodium vivax subtelomeric transmembrane proteins (PvSTPs) show homology to the intracellular regions of PfEMP1 and Pf332, both of which are involved in RBC membrane skeleton interactions, and contribute to malaria pathology.



Two transfected lines expressing recombinant SURFINs (NTC-GFP and NTC-4.2WRD2-GFP) of the 3D7 sequence were generated by transfection in P. falciparum. In vitro binding assays were performed by using recombinant WRDs of SURFIN4.2/PvSTP2 and inside-out vesicles (IOVs). The interactions between the recombinant WRDs of SURFIN4.2/PvSTP2 with actin and spectrin were evaluated by the actin spin down assay and an enzyme-linked immunosorbent assay based binding assays, respectively.



The recombinant SURFINs (NTC-4.2WRD2-GFP), in which the second WRD from SURFIN4.2was added back to NTC-GFP, show diffused pattern of fluorescence in the iRBC cytosol. Furthermore, WRDs of SURFIN4.2/PvSTP2 were found to directly interact with the IOVs of RBC, with binding affinities ranging from 0.26 to 0.68 μM, values that are comparable to other reported parasite proteins that bind to the RBC membrane skeleton. Further experiments revealed that the second WRD of SURFIN4.2bound to F-actin (Kd= 5.16 μM) and spectrin (Kd= 0.51 μM).



Because PfEMP1 and Pf332 also bind to actin and/or spectrin, the authors propose that the interaction between WRD and RBC membrane skeleton might be a common feature of WRD-containing proteins and may be important for the translocation of these proteins from Maurer's clefts to the iRBC surface. The findings suggest a conserved mechanism of host-parasite interactions and targeting this interaction may disrupt the iRBC surface exposure of Plasmodium virulence-related proteins.
Department of Immunology, College of Basic Medical Science, China Medical University, Shenyang, 110122, Liaoning, China.
Xiaotong
X
Zhu
Department of Immunology, College of Basic Medical Science, China Medical University, Shenyang, 110122, Liaoning, China.
Yang
Y
He
98K 73B Seven-year Programme 127306, China Medical University, Shenyang, 110001, Liaoning, China.
Yifan
Y
Liang
Department of Protozoology, Institute of Tropical Medicine (NEKKEN), Nagasaki University, 1-12-4 Sakamoto, Nagasaki, 852-8523, Japan.
Osamu
O
Kaneko
Department of Immunology, College of Basic Medical Science, China Medical University, Shenyang, 110122, Liaoning, China. luc2@psu.edu.|Department of Entomology, The Pennsylvania State University, University Park, PA, 16802, USA. luc2@psu.edu.
Liwang
L
Cui
Department of Immunology, College of Basic Medical Science, China Medical University, Shenyang, 110122, Liaoning, China. ymcao@mail.cmu.edu.cn.
Yaming
Y
Cao
D004912:Erythrocytes / Q000469:parasitology*; D006801:Humans; D008565:Membrane Proteins / Q000378:metabolism*; D010963:Plasmodium falciparum / Q000502:physiology*; D010966:Plasmodium vivax / Q000502:physiology*; D015800:Protozoan Proteins / Q000378:metabolism*; D014364:Tryptophan / Q000737:chemistry
D008565:Membrane Proteins; D015800:Protozoan Proteins; C503134:SURFIN 4.2 protein, Plasmodium falciparum; D014364:Tryptophan
F-actin; RBC membrane skeleton; SURFIN; Spectrin; Tryptophan-rich domain