New insights into the substrate specificity of macrophage elastase MMP-12

Abstract : Macrophage elastase, or MMP-12, is mainly produced by alveolar macrophages and is believed to play a major role in the development of chronic obstructive pulmonary disease (COPD). The catalytic domain of MMP-12 is unique among MMPs in that it is very highly active on numerous substrates including elastin. However, measuring MMP-12 activity in biological fluids has been hampered by the lack of highly selective substrates. We therefore synthesized four series of fluorogenic peptide substrates based on the sequences of MMP-12 cleavage sites in its known substrates. Human MMP-12 efficiently cleaved peptide substrates containing a Pro at P3 in the sequence ProX-X down arrow Leu but lacked selectivity towards these substrates compared to other MMPs, including MMP-2, MMP-7, MMP-9 and MMP-13. On the contrary, the substrate Abz-RNALAVERTAS-EDDnp derived from the CXCR5 chemokine was the most selective substrate for MMP-12 ever reported. All substrates were cleaved more efficiently by full-length MMP-12 than by its catalytic domain alone, indicating that the C-terminal hemopexin domain influences substrate binding and/or catalysis. Docking experiments revealed unexpected interactions between the peptide substrate Abz-RNALAVERTAS-EDDn and MMP-12 residues. Most of our substrates were poorly cleaved by murine MMP-12 suggesting that human and murine MMP-12 have different substrate specificities despite their structural similarity.
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Contributeur : Csga - Université de Bourgogne <>
Soumis le : jeudi 17 novembre 2016 - 16:04:22
Dernière modification le : vendredi 12 juillet 2019 - 01:29:18

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Anne-Sophie Lamort, Rodolphe Gravier, Anni Laffitte, Luiz Juliano, Marie-Louise Zani, et al.. New insights into the substrate specificity of macrophage elastase MMP-12. Biological Chemistry, De Gruyter, 2016, 397 (5), ⟨10.1515/hsz-2015-0254⟩. ⟨hal-01398704⟩



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