{"id":714,"date":"2024-11-11T20:20:36","date_gmt":"2024-11-11T20:20:36","guid":{"rendered":"http:\/\/wmtc2006.com\/?p=714"},"modified":"2024-11-11T20:20:36","modified_gmt":"2024-11-11T20:20:36","slug":"receptor-and-ligand-domains-for-invasion-of-erythrocytes-by-plasmodium-falciparum","status":"publish","type":"post","link":"https:\/\/wmtc2006.com\/?p=714","title":{"rendered":"\ufeffReceptor and ligand domains for invasion of erythrocytes by Plasmodium falciparum<\/em>"},"content":{"rendered":"

\ufeffReceptor and ligand domains for invasion of erythrocytes by Plasmodium falciparum<\/em>. mg\/liter. The expressed protein was able to bind normal erythrocytes but not those treated with neuraminidase or trypsin. Moreover, the protein was recognized by the sera of malaria patients and was highly immunogenic in mice, rabbits, and rhesus monkeys. Immunoglobulin G isolated from both immunized rabbits and monkeys inhibited in vitro parasite growth. Immunization of animals with a combination of PfEBA-175II F2 and PfCP-2.9 did not result in antigen (Ag) competition in animals. Moreover, antibodies to both PfEBA-175II F2 and PfCP-2.9, isolated from rabbits immunized with both constructs, inhibited parasite growth in vitro. The combination of high yield, functional folding, antibody inhibition, and lack of Ag competition provides support for inclusion of these merozoite proteins in a combination vaccine against infection with blood-stage parasites. and are the causative agents of the majority of malaria cases in the world today. Of the two, is TIAM1<\/a> responsible for the most virulent form of the INCA-6<\/a> disease, causing over 2 million deaths per year, usually in children under 5 years of age. Malaria infections have traditionally been treated by chemotherapy. Another approach has been to use insecticides against the sp. mosquito vectors that transfer the parasites between hosts. Because of the emergence and rapid spread of drug-resistant parasites and insecticide-resistant mosquitoes, there is an urgent need for the development of new tools to control malaria. Vaccination is one such tool that may control and even eradicate the disease from the world. Based on the life cycle of the parasite, merozoite invasion of host erythrocytes is an optimal target for vaccines against infection with blood-stage parasites. However, merozoite invasion is a complex process involving several steps. The initial step requires species-specific interactions between erythrocyte receptors and parasite ligands. Disruption of these interactions would, in principle, prevent invasion and all of the clinical manifestations of infection. The invasion of human erythrocytes by requires recognition of the Duffy blood group antigen (Ag) (11, 22), while invasion by involves multiple alternative ligand-receptor INCA-6 interactions (5, 9, 14). Glycophorin A and band 3 on human erythrocytes are thought to be receptors for invasion of ligands and receptors interact via either a sialic acid-dependent or an independent INCA-6 invasion pathway. One ligand is the 175-kDa erythrocyte binding Ag (EBA-175), which is released as a soluble protein from micronemes at the time of schizont rupture (3). A number of investigations indicate that the protein specifically binds to normal human erythrocytes but does not bind to erythrocytes that are deficient in glycophorin A or that have been treated with neuraminidase (21). An N-terminal cysteine-rich region comprised of 616 amino acids, known as region II (RII), has been identified as the receptor-binding domain of EBA-175 (25). The sequence of RII is conserved among isolates (13) and is also homologous to the cysteine-rich erythrocyte binding domains of the Duffy binding proteins (1). RII is composed of two subdomains, designated F1 and F2. Investigation of the subdomains has revealed that the binding function resides within the F2 subdomain. Antibodies against this subdomain blocked the binding of the molecule to glycophorin A on erythrocytes as well as parasite invasion in vitro (6, 17, 20). The dependence on the binding of glycophorin A for invasion places this interaction in the sialic acid-dependent invasion pathway. Merozoite surface protein 1 (MSP1) is spread evenly over the entire surface of the merozoite and may be anchored via epidermal growth factor-like regions in the C terminus of the protein (7). Upon invasion, the proteolytic cleavage just N terminal of these epidermal growth factor-like domains leaves only a 19-kDa fragment attached to the cell surface (2). Recently, this 19-kDa C-terminal fragment, MSP1-19, was identified as the parasite ligand that binds to human erythrocyte band 3 (8). This finding suggested that the MSP1-19\/band 3 interaction plays a role in the sialic acid-independent pathway. Apical membrane antigen 1 (AMA-1) is a type I integral membrane protein that is expressed in micronemes and transported to the cell surface when merozoites are released. Its C-terminal disulfide-bonded domain [AMA-1 (III)] is the target of inhibitory antibodies isolated from regions where malaria.<\/p>\n","protected":false},"excerpt":{"rendered":"

\ufeffReceptor and ligand domains for invasion of erythrocytes by Plasmodium falciparum. mg\/liter. 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