Construction of a plasminogen activator inhibitor-1 variant without measurable affinity to vitronectin but otherwise normal |
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Authors: | Jensen Jan K Durand Michelle K V Skeldal Sune Dupont Daniel M Bødker Julie S Wind Troels Andreasen Peter A |
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Institution: | Laboratory of Cellular Protein Science, Department of Molecular Biology, Aarhus University, Gustav Wieds Vej 10C, 8000 C, Aarhus, Denmark. jkj@mb.au.dk |
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Abstract: | Vitronectin (VN) and plasminogen activator inhibitor-1 (PAI-1) have important functional interactions: VN stabilises the protease inhibitory activity of PAI-1 and PAI-1 inhibits binding of adhesion receptors to VN. Having previously mapped the PAI-1 binding area for VN, we have now constructed a PAI-1 variant, R103A-M112A-Q125A, without measurable affinity to VN, but with full protease inhibitory activity and endocytosis receptor binding. As a tool for evaluating the physiological and pathophysiological functions of the PAI-1-VN interaction, our new variant is far superior to the previously widely used PAI-1 variant Q125K, which we have found possesses an only about 10-fold reduced affinity to VN. |
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