title: 3D structure and immunogenicity of Plasmodium falciparum sporozoite induced associated protein peptides as components of fully-protective anti-malarial vaccine.
abstract: SIAP-1 and SIAP-2 are proteins which are implicated in early events involving Plasmodium falciparum infection of the Anopheles mosquito vector and the human host. High affinity HeLa and HepG2 cell binding conserved peptides have been previously identified in these proteins, i.e. SIAP-1 34893 ((421)KVQGLSYLLRRKNGTKHPVY(440)) and SIAP-1 34899 ((541)YVLNSKLLNSRSFDKFKWIQ(560)) and SIAP-2 36879 ((181)LLLYSTNSEDNLDISFGELQ(200)). When amino acid sequences have been properly modified (replacements shown in bold) they have induced high antibody titres against sporozoites in Aotus monkeys (assessed by IFA) and in the corresponding recombinant proteins (determined by ELISA and Western blot). (1)H NMR studies of these conserved native and modified high activity binding peptides (HABPs) revealed that all had α-helical structures in different locations and lengths. Conserved and corresponding modified HABPs displayed different lengths between the residues fitting into MHCII molecule pockets 1-9 and different amino acid orientation based on their different HLA-DRβ1(∗) binding motifs and binding registers, suggesting that such modifications were associated with making them immunogenic. The results suggested that these modified HAPBs could be potential targets for inclusion as components of a fully-effective, minimal sub-unit based, multi-epitope, and multistage anti-malarial vaccine.
authors: Fundación Instituto de Inmunología de Colombia, Bogotá, Colombia.
authors: Martha P
authors: MP
authors: Alba
authors: Hannia
authors: H
authors: Almonacid
authors: Dayana
authors: D
authors: Calderón
authors: Edgar A
authors: EA
authors: Chacón
authors: Luis A
authors: LA
authors: Poloche
authors: Manuel A
authors: MA
authors: Patarroyo
authors: Manuel E
authors: ME
authors: Patarroyo
mesh_terms: D000595:Amino Acid Sequence; D006801:Humans; D016056:Immunodominant Epitopes / Q000737:chemistry / Q000235:genetics / Q000276:immunology; D017780:Malaria Vaccines / Q000737:chemistry* / Q000276:immunology*; D008969:Molecular Sequence Data; D010455:Peptides / Q000737:chemistry / Q000235:genetics / Q000276:immunology; D010963:Plasmodium falciparum / Q000276:immunology*; D015800:Protozoan Proteins / Q000737:chemistry* / Q000235:genetics / Q000276:immunology*; D011994:Recombinant Proteins / Q000737:chemistry / Q000235:genetics / Q000276:immunology; D034101:Sporozoites / Q000276:immunology; D022223:Vaccines, Subunit / Q000737:chemistry / Q000235:genetics / Q000276:immunology
chemical_list: D016056:Immunodominant Epitopes; D017780:Malaria Vaccines; D010455:Peptides; D015800:Protozoan Proteins; D011994:Recombinant Proteins; D022223:Vaccines, Subunit