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Título: | Cloning, molecular analysis and differential cell localisation of the p36 RACK analogue antigen from the parasite protozoon Crithidia fasciculata |
Autor: | Taladriz, Soraya; González-Aseguinolaza, Gloria; Marquet, Alberto; Larraga, Vicente CSIC ORCID | Palabras clave: | p36 RACK analogue Protein kinase C activation Crithidia fasciculata |
Fecha de publicación: | 29-ene-1999 | Editor: | John Wiley & Sons | Citación: | FEBS Lett 443 (3) 375-80 (1999) | Resumen: | The family of the RACK molecules (receptors for activated C kinases) are present in all the species studied so far. In the genus Leishmania, these molecules also induce a strong immune reaction against the infection. We have cloned and characterised the gene that encodes the RACK analogue from the parasite trypanosomatid Crithidia fasciculata (CACK). The molecule seems to be encoded by two genes. The sequence analysis of the cloned open reading frame indicates the existence of a high degree of conservation not only with other members of the Trypanosomatidae but also with mammalians. The study of the protein kinase C phosphorylation sites shows the presence of three of them, shared with the mammalian species, additional to those present in the other protozoa suggesting a certain phylogenetic distance between the protozoon Crithidia fasciculata and the rest of the Trypanosomatidae. The CACK-encoded polypeptide shows an additional sequence of four amino acids at the carboxy-terminal end, which produces a different folding of the fragment with the presence of an alpha-helix instead of the beta-sheet usual in all the other species studied. A similar result is elicited at the amino-terminal end by the change of three amino acid residues. The immunolocalisation experiments show that the CACK displays a pattern with a distribution mainly at the plasma membrane, different from that of the related Leishmania species used as control, that displays a distribution close to the nucleus. Altogether, the data suggest that the existence of the structural differences found may have functional consequences. | Descripción: | 6 p.-6 fig. | Versión del editor: | https://doi.org/10.1016/s0014-5793(99)00006-x | URI: | http://hdl.handle.net/10261/212119 | DOI: | 10.1016/s0014-5793(99)00006-x | ISSN: | 0014-5793 | E-ISSN: | 1873-3468 |
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