Signal transduction through the Gal-GalNAc lectin of Entamoeba histolytica involves a spectrin-like protein.
Capping followed by uroid formation in Entamoeba histolytica has been implicated in resistance against the host immune response during development of amoebiasis. The amebic actomyosin cytoskeleton is essential for such a process. A protein from the spectrin family co-localizes with the Gal-GalNAc lectin during capping of this surface protein complex. Co-localization is not observed when capping of the Gal-GalNAc lectin is specifically inhibited by production of the carboxyl-terminal region of its heavy chain that includes the lectin cytoplasmic tail. A peptide encompassing the lectin last 77 amino acids fused to glutathione-S-transferase interacts in vitro with purified spectrin. The spectrin-binding site was narrowed down to a stretch of 21 amino acids within the lectin cytoplasmic domain. This is the first report identifying an amino acid sequence involved in the interaction between the Gal-GalNAc lectin and cytoskeletal spectrin.
Unité de Biologie Cellulaire du Parasitisme, Institut National de la Santé et de la Recherche Médicale U389, Institut Pasteur, 28 Rue du Dr Roux, 75724 Paris Cedex 15, France.
Sabrina
S
Marion
Paulo
P
Tavares
Philippe
P
Arhets
Nancy
N
Guillén
D000222:Adaptation, Physiological; D000595:Amino Acid Sequence; D000818:Animals; D002462:Cell Membrane / Q000737:chemistry; D003593:Cytoplasm / Q000737:chemistry; D004748:Entamoeba histolytica / Q000737:chemistry / Q000166:cytology / Q000378:metabolism*; D037161:Galectins / Q000235:genetics / Q000378:metabolism*; D008969:Molecular Sequence Data; D009024:Morphogenesis; D011485:Protein Binding; D025941:Protein Interaction Mapping; D017434:Protein Structure, Tertiary; D015800:Protozoan Proteins / Q000235:genetics / Q000378:metabolism*; D015398:Signal Transduction; D013049:Spectrin / Q000378:metabolism*
D037161:Galectins; D015800:Protozoan Proteins; D013049:Spectrin