Solubilized elastin substrate for continuous fluorimetric assay of kinetics of elastases |
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Authors: | Mark O. Palmier Yan G. Fulcher Steven R. Van Doren |
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Affiliation: | Department of Biochemistry, 117 Schweitzer Hall, University of Missouri, Columbia, MO 65211, USA |
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Abstract: | Elastolysis is central to progression of emphysema and aortic aneurysms. Characterization of steady-state enzyme kinetics of elastolysis is fettered by the insolubility of mature elastin and the polydispersity of solubilized elastin. We prepared a fluor-tagged, 100-kDa fraction (fEln-100) from commercial α-elastin. It is soluble, less heterogeneous in mass, cross-linked like mature elastin, and likely to retain the capacity of α-elastin to self-assemble. fEln-100 has introduced the ability to compare quantitatively the apparentkcat and Km of elastases. For example, metalloelastase (MMP-12) displays higher apparent affinity for fEln-100, while MMP-2 displays faster catalytic turnover. |
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