Abstract
The structure in solution of the second Ig-module fragment of residues 117–208 of NCAM has been determined. Like the first Ig-module of residues 20–116, it belongs to the I set of the immunogloblin superfamily. Module 1 and module 2 interact weakly, and the binding sites of this interaction have been identified. The two–module fragment NCAM(20–208) is a stable dimer. Removal of the charged residues in these sites in NCAM(20–208) abolishes the dimerization. Modeling the dimer of NCAM(20–208) to fit the interactions of these charges produces one coherent binding site for the formation of two antiparallel strands of the first two NCAM modules. This mode of binding could be a major element in trans–cellular interactions in neural cell adhesion.
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Acknowledgements
The group at the Protein Laboratory was supported by the Danish Biotechnology Programme, The Lundbeck Foundation, the Danish Cancer Society, and The EU programme on Biotechnology. The group at the Carlsberg Laboratory was supported by The Danish Biotechnology Programme. This is a contribution from the Danish Instrument Center for NMR spectroscopy of Biological Macromolecules.
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Jensen, P., Soroka, V., Thomsen, N. et al. Structure and interactions of NCAM modules 1 and 2, basic elements in neural cell adhesion. Nat Struct Mol Biol 6, 486–493 (1999). https://doi.org/10.1038/8292
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DOI: https://doi.org/10.1038/8292
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