Metalloprotease meprin β is activated by transmembrane serine protease matriptase-2 at the cell surface thereby enhancing APP shedding

Jäckle, Felix, Schmidt, Frederike, Wichert, Rielana, Arnold, Philipp, Prox, Johannes, Mangold, Martin, Ohler, Anke, Pietrzik, Claus U., Koudelka, Tomas, Tholey, Andreas, Gütschow, Michael, Stirnberg, Marit and Becker-Pauly, Christoph (2015) Metalloprotease meprin β is activated by transmembrane serine protease matriptase-2 at the cell surface thereby enhancing APP shedding Biochemical Journal, 470 (1). pp. 91-103. DOI 10.1042/BJ20141417.

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Abstract

Increased expression of metalloprotease meprin β is associated with fibrotic syndromes and Alzheimer's disease (AD). Hence, regulation of meprin activity might be a suitable strategy for the treatment of these conditions. Meprin β is a type 1 transmembrane protein, but can be released from the cell surface by ectodomain shedding. The protease is expressed as an inactive zymogen and requires proteolytic maturation by tryptic serine proteases. In the present study, we demonstrate, for the first time, the differences in the activation of soluble and membrane bound meprin β and suggest transmembrane serine protease 6 [TMPRSS6 or matriptase-2 (MT2)] as a new potent activator, cleaving off the propeptide of meprin β between Arg(61) and Asn(62) as determined by MS. We show that MT2, but not TMPRSS4 or pancreatic trypsin, is capable of activating full-length meprin β at the cell surface, analysed by specific fluorogenic peptide cleavage assay, Western blotting and confocal laser scanning microscopy (CLSM). Maturation of full-length meprin β is required for its activity as a cell surface sheddase, releasing the ectodomains of transmembrane proteins, as previously shown for the amyloid precursor protein (APP).

Document Type: Article
Keywords: amyloid precursor protein; cell membrane; enzymology; matriptase-2; meprin β; sheddase
Research affiliation: Kiel University > Kiel Marine Science
Refereed: Yes
DOI etc.: 10.1042/BJ20141417
ISSN: 0264-6021
Date Deposited: 01 Feb 2018 12:51
Last Modified: 01 Feb 2018 12:51
URI: http://eprints.uni-kiel.de/id/eprint/41793

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