Download MendeleyStructural basis for the sheddase function of human meprin beta metalloproteinase at the plasma membrane
Arolas, J.L., Broder, C., Jefferson, T., Guevara, T., Sterchi, E.E., Bode, W., Stocker, W., Becker-Pauly, C., Gomis-Ruth, F.X.(2012) Proc Natl Acad Sci U S A 109: 16131-16136
- PubMed: 22988105
- DOI: https://doi.org/10.1073/pnas.1211076109
- Primary Citation of Related Structures:
4GWM, 4GWN - PubMed Abstract:
Ectodomain shedding at the cell surface is a major mechanism to regulate the extracellular and circulatory concentration or the activities of signaling proteins at the plasma membrane. Human meprin β is a 145-kDa disulfide-linked homodimeric multidomain type-I membrane metallopeptidase that sheds membrane-bound cytokines and growth factors, thereby contributing to inflammatory diseases, angiogenesis, and tumor progression. In addition, it cleaves amyloid precursor protein (APP) at the β-secretase site, giving rise to amyloidogenic peptides. We have solved the X-ray crystal structure of a major fragment of the meprin β ectoprotein, the first of a multidomain oligomeric transmembrane sheddase, and of its zymogen. The meprin β dimer displays a compact shape, whose catalytic domain undergoes major rearrangement upon activation, and reveals an exosite and a sugar-rich channel, both of which possibly engage in substrate binding. A plausible structure-derived working mechanism suggests that substrates such as APP are shed close to the plasma membrane surface following an "N-like" chain trace.
Organizational Affiliation:
Proteolysis Laboratory, Department of Structural Biology, Molecular Biology Institute of Barcelona, Consejo Superior de Investigaciones Cientificas, Barcelona Science Park, E-08028 Barcelona, Spain.
