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dc.contributor.author
Martín, Osvaldo Antonio  
dc.contributor.author
Villegas, Myriam Edith  
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Aguilar, Carlos F.  
dc.date.available
2024-05-17T13:56:46Z  
dc.date.issued
2009-12  
dc.identifier.citation
Martín, Osvaldo Antonio; Villegas, Myriam Edith; Aguilar, Carlos F.; Three-dimensional studies of pathogenic peptides from the c-terminal of Trypanosoma cruziribosomal P proteins and their interaction with a monoclonal antibody structural model; BioMed Central; PMC Biophysics; 2; 1; 12-2009; 1-15  
dc.identifier.issn
1757-5036  
dc.identifier.uri
http://hdl.handle.net/11336/235633  
dc.description.abstract
The acidic C-terminal peptides from Trypanosoma cruzi ribosomal P proteins are the major target of the antibody response in patients suffering Chagas chronic heart disease. It has been proposed that the disease is triggered by the cross-reaction of these antibodies with the second extra cellular loop of the (beta)1-adrenoreceptor, brought about by the molecular mimicry between the acidic C-terminal peptides and the receptor´s loop. To improve the understanding of the structural basis of the autoimmune response against heart receptors, the 3-dimensional structure of the C-terminal peptides of Trypanosoma cruzi ribosomal proteins P0 (EDDDDDFGMGALF) and P2(beta) (EEEDDDMGFGLFD) were solved using the Electrostaticaly Driven MonteCarlo method. Their structures were compared with the second extra-cellular loop of our homology model of human rhodopsin and the existing experimental NMR structures of the C-terminal peptides from human P0 (EESDDDMGFGLFD) and from Leishmania braziliensis P0 (EEADDDMGFGLFD). Docking of Trypanosoma cruzi peptides P0, P2(beta) and human rhodopsin loop into our anti-P2(beta) monoclonal antibody homology model allowed to explore their interactions. The solution structure of peptides P0 and P2(beta) can be briefly described as a bend. Although the global conformations of the peptides are not identical they shared a common region of four residues (3 to 6) that have a similar structure. The structural alignment of the five peptides also showed a surprising conformational similarity for the same residues. The antibody model and docking studies revealed a most remarkable feature in the active site, a positively charged, narrow and deep cavity where the acidic residues 3 to 6 were accommodated. These results suggest that the most important elements in the molecular peptide recognition by the antibody may be the shape of the loop and the presence of negative charges in positions 3?5 (P0, P2(beta)) or a negative charge in position 4 (rhodopsin loop). This work describes clearly the interactions of the structural elements involved in the autoimmune mechanism of anti-P auto-antibodies cross-reaction and stimulation of the (beta)1-adrenoreceptor and the visual pigment rhodopsin. Results from this study could lead eventually to the development of treatments to abolish receptor mediated symptoms in Chagas.  
dc.format
application/pdf  
dc.language.iso
eng  
dc.publisher
BioMed Central  
dc.rights
info:eu-repo/semantics/openAccess  
dc.rights.uri
https://creativecommons.org/licenses/by-nc/2.5/ar/  
dc.subject
PEPTIDES  
dc.subject
P PROTEINS  
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MODELLING  
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ANTIBODY  
dc.subject.classification
Biofísica  
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Ciencias Biológicas  
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CIENCIAS NATURALES Y EXACTAS  
dc.title
Three-dimensional studies of pathogenic peptides from the c-terminal of Trypanosoma cruziribosomal P proteins and their interaction with a monoclonal antibody structural model  
dc.type
info:eu-repo/semantics/article  
dc.type
info:ar-repo/semantics/artículo  
dc.type
info:eu-repo/semantics/publishedVersion  
dc.date.updated
2024-05-03T13:59:45Z  
dc.journal.volume
2  
dc.journal.number
1  
dc.journal.pagination
1-15  
dc.journal.pais
Estados Unidos  
dc.description.fil
Fil: Martín, Osvaldo Antonio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Luis. Instituto de Matemática Aplicada de San Luis "Prof. Ezio Marchi". Universidad Nacional de San Luis. Facultad de Ciencias Físico, Matemáticas y Naturales. Instituto de Matemática Aplicada de San Luis "Prof. Ezio Marchi"; Argentina  
dc.description.fil
Fil: Villegas, Myriam Edith. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Luis. Instituto de Matemática Aplicada de San Luis "Prof. Ezio Marchi". Universidad Nacional de San Luis. Facultad de Ciencias Físico, Matemáticas y Naturales. Instituto de Matemática Aplicada de San Luis "Prof. Ezio Marchi"; Argentina  
dc.description.fil
Fil: Aguilar, Carlos F.. Universidad Nacional de San Luis; Argentina  
dc.journal.title
PMC Biophysics  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://pmcbiophys.biomedcentral.com/articles/10.1186/1757-5036-2-4  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1186/1757-5036-2-4