The structure of the N-terminal region of murine skeletal muscle alpha-dystroglycan discloses a modular architecture |
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Authors: | Bozic Damir Sciandra Francesca Lamba Doriano Brancaccio Andrea |
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Institution: | Biochemisches Institut der Universit?t Zürich, Zürich 8044, Switzerland. damir.bozic@mat.ethz.ch |
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Abstract: | Dystroglycan (DG) is a cell surface receptor consisting of two subunits: alpha-dystroglycan, extracellular and highly glycosylated, and beta-dystroglycan, spanning the cell membrane. It is a pivotal member of the dystrophin-glycoprotein complex and is involved in a wide variety of important cellular processes such as the stabilization of the muscle fiber sarcolemma or the clustering of acetylcholine receptors. We report the 2.3-A resolution crystal structure of the murine skeletal muscle N-terminal alpha-DG region, which confirms the presence of two autonomous domains; the first finally identified as an Ig-like and the second resembling ribosomal RNA-binding proteins. Solid-phase laminin binding assays show the occurrence of protein-protein type of interactions involving the Ig-like domain of alpha-DG. |
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