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Basement Membrane Protein BM-40

Erhard Hohenester

Erhard Hohenester

Imperial College, Department of Biological Sciences, London, UK

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Rupert Timpl

Rupert Timpl

Max-Planck-Institut für Biochemie, Martinsried, Germany

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First published: 15 December 2011

Abstract

BM-40, also known as SPARC or osteonectin, is a secreted glycoprotein present in all metazoa. The protein is expressed in tissues undergoing morphogenesis, remodeling, and repair. In vitro, BM-40 binds to several collagens and is both antiproliferative and counteradhesive. Human BM-40 consists of an acidic N-terminal domain, a follistatin-like (FS) domain, and an α-helical (EC) domain that contains two functional EF-hand calcium-binding motifs. The crystal structure of the FS–EC domain pair has been determined. Calcium and collagen binding to the EC domain has been studied using site-directed mutagenesis, spectroscopy, and binding assays.

3D Structure

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Schematic representation of the structure of the BM-40 FS–EC domain pair containing two calcium ions, PDB code 1BMO.35 The FS and EC domains are in green and blue respectively. Disulfide bridges are shown as yellow sticks. Calcium ions are shown as pink spheres. Made with BOBSCRIPT38 and RASTER3D.39

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