Abstract
The proteolytic processing of collagen I by three matrix metalloproteinases (MMPs), a collagenase (MMP-1), a gelatinase (MMP-2), and the ectodomain of a membrane-type metalloproteinase (MMP-14), has been investigated at 37 °C between pH 6.0 and 9.2, a pH range reflecting conditions found in different body compartments under various physiopathological processes. In the proteolytic degradation the native collagen triple helix must be partially unwound to allow the binding of α chains to the protease’s active-site cleft. We have found that MMP-1 interacts with the two types of collagen I α chains in a similar fashion, whereas both MMP-2 and MMP-14 bind the two α chains in a different way. The overall enzymatic activity is higher on the α-2 chain for both MMP-1 and MMP-2, whereas the MMP-14 ectodomain preferentially cleaves the α-1 chain. In MMP-2 a marked difference for substrate affinity (higher for the α-1 chain) is overwhelmed by an even more marked propensity to cleave the α-2 chain. As a whole, the three classes of MMPs investigated appear to process collagen I in a significantly different fashion, so various MMPs play different roles in the collagen homeostasis in various compartments (such as bloodstream, synovial fluid, normal and tumoral tissues), where different pH values are observed.
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Abbreviations
- CD:
-
Circular dichroism
- ECM:
-
Extracellular matrix
- ect-MMP-14:
-
Ectodomain of matrix metalloproteinase 14
- MCA-1:
-
(7-Methoxycoumarin-4-yl)acetyl-Pro-cyclohexylalanine-Gly-norvaline-His-Ala-(N-3-(2,4-dinitrophenyl)-l-2,3-diaminopropionyl)-NH2
- MCA-MMP14:
-
(7-Methoxycoumarin-4-yl)acetyl-Pro-Leu-Ala-Cys(p-OMeBz)-Trp-Ala-Arg(N-3-(2,4-dinitrophenyl)-l-2,3-diaminopropionyl)-NH2
- MCA-omni:
-
(7-Methoxycoumarin-4-yl)acetyl–Pro-Leu-Gly-Leu-(N-3-(2,4-dinitrophenyl)-l-2,3-diaminopropionyl)-Ala-Arg-NH2
- MMP:
-
Matrix metalloproteinase
- PAGE:
-
Polyacrylamide gel electrophoresis
- SDS:
-
Sodium dodecyl sulfate
- Tris:
-
Tris(hydroxymethyl)aminomethane
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Acknowledgments
This work was financially supported by the Italian Space Agency (ASI 2005 OSMA to U.T. and M.C.). The authors are grateful to Hideaki Nagase and Tayebeh Pourmotabbed for very fruitful discussions.
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M. Gioia and G. F. Fasciglione contributed equally to the work.
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Gioia, M., Fasciglione, G.F., Monaco, S. et al. pH dependence of the enzymatic processing of collagen I by MMP-1 (fibroblast collagenase), MMP-2 (gelatinase A), and MMP-14 ectodomain. J Biol Inorg Chem 15, 1219–1232 (2010). https://doi.org/10.1007/s00775-010-0680-8
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DOI: https://doi.org/10.1007/s00775-010-0680-8