Lipid-binding role of betaII-spectrin ankyrin-binding domain |
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Authors: | Bok Ewa Plazuk Ewa Hryniewicz-Jankowska Anita Chorzalska Anna Szmaj Agnieszka Dubielecka Patrycja M Stebelska Katarzyna Diakowski Witold Lisowski Marek Langner Marek Sikorski Aleksander F |
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Institution: | 1. Institute of Biochemistry and Molecular Biology, University of Wroc?aw, ul. Przybyszewskiego 63/77, 51-149 Wroc?aw, Poland;2. Academic Centre for Biotechnology of Lipid Aggregates, ul. Przybyszewskiego 63/77, 51-149 Wroc?aw, Poland;3. Faculty of Chemistry, University of Wroc?aw, ul. I. Joliot-Curie 14, 50-383 Wroc?aw, Poland;4. Institute of Physics, Wroc?aw University of Technology, Wybrze?e Wyspiańskiego 27, 50-370 Wroc?aw, Poland |
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Abstract: | It is known that erythroid and non-erythroid spectrins binding of vesicles and monolayers containing PE proved sensitive to inhibition by red blood cell ankyrin. We now show that the bacterially-expressed recombinant peptides representing betaII(brain)-spectrin's ankyrin-binding domain and its truncated mutants showed lipid-binding activity, although only those containing a full-length amino terminal fragment showed high to moderate affinity towards phospholipid mono- and bilayers and a substantial sensitivity of this binding to inhibition by ankyrin. These results are in accordance with our published data on betaI-spectrin's ankyrin-binding domain Hryniewicz-Jankowska A, et al. Mapping of ankyrin-sensitive, PE/PC mono- and bilayer binding site in erythroid beta-spectrin. Biochem J 2004;382:677-85]. Moreover, we tested also the effect of transient transfection of living cells of several cell-lines with vectors coding for GFP-conjugates including betaII and also betaI full-length ankyrin-binding domain and their truncated fragments on the membrane skeleton organization. The transfection with constructs encoding full-length ankyrin-binding domain of betaII and betaI spectrin resulted in increased aggregation of membrane skeleton and its punctate appearance in contrast to near normal appearance of membrane skeleton of cells transiently transfected with GFP control or construct encoding ankyrin-binding domain truncated at their N-terminal region. Our results therefore indicate the importance of N-terminal region for lipid-binding activity of the beta-spectrin ankyrin-binding domain and its substantial role in maintaining the spectrin-based skeleton distribution. |
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Keywords: | Non-erythroid β -spectrin Erythroid β -spectrin Spectrin– phospholipid interaction Ankyrin-binding domain Phospholipid monolayers and liposomes Phosphatidyl ethanolamine Phosphatidyl serine |
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