Domain organization of Mac-2 binding protein and its oligomerization to linear and ring-like structures

Muller, S. A. and Sasaki, T. and Bork, P. and Wolpensinger, B. and Schulthess, T. and Timpl, R. and Engel, A. and Engel, J.. (1999) Domain organization of Mac-2 binding protein and its oligomerization to linear and ring-like structures. Journal of molecular biology, Vol. 291, H. 4. pp. 801-813.

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Official URL: http://edoc.unibas.ch/dok/A5257675

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The multidomain Mac-2 binding protein (M2BP) is present in serum and in the extracellular matrix in the form of linear and ring-shaped oligomers, which interact with galectin-3, fibronectin, collagens, integrins and other large glycoproteins. Domain 1 of M2BP (M2BP-1) shows homology with the cysteine-rich SRCR domain of scavanger receptor. Domains 2 and 3 are related to the dimerization domains BTB/POZ and IVR of the Drosophila kelch protein. Recombinant M2BP, its N-terminal domain M2BP-1 and a fragment consisting of putative domains 2, 3 and 4 (M2BP-2,3,4) were investigated by scanning transmission electron microscopy, transmission electron microscopy, analytical ultracentrifugation and binding assays. The ring oligomers formed by the intact protein are comprised of approximately 14 nm long segments composed of two 92 kDa M2BP monomers. Although the rings vary in size, decamers predominate. The various linear oligomers also observed are probably ring precursors, dimers predominate. M2BP-1 exhibits a native fold, does not oligomerize and is inactive in cell attachment. M2BP-2,3,4 aggregates to heterogeneous, protein filled ring-like structures as shown by metal shadowed preparations. These aggregates retain the cell-adhesive potential indicating native folding. It is hypothesized that the rings provide an interaction pattern for multivalent interactions of M2BP with target molecules or complexes of ligands.
Faculties and Departments:05 Faculty of Science > Departement Biozentrum > Former Organization Units Biozentrum > Structural Biology (Engel)
UniBasel Contributors:Engel, Andreas H
Item Type:Article, refereed
Article Subtype:Research Article
Note:Publication type according to Uni Basel Research Database: Journal article
Last Modified:22 Mar 2012 14:20
Deposited On:22 Mar 2012 13:18

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