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Crystal Structure of the Urokinase Receptor in a Ligand-Free Form

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  1. Lactate-Mediated Protection of Retinal Ganglion Cells

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  2. The Limitations of In Vitro Experimentation in Understanding Biofilms and Chronic Infection

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  3. Stabilizing a flexible interdomain hinge region harboring the SMB binding site drives uPAR into its closed conformation

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  4. Multiple barriers to recombination between divergent HIV-1 variants revealed by a dual-marker recombination assay

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  5. Quorum sensing regulation in Aeromonas hydrophila

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  1. ANGPTL4 inactivates lipoprotein lipase by catalyzing the irreversible unfolding of LPL's hydrolase domain

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  2. Intermittent chylomicronemia caused by intermittent GPIHBP1 autoantibodies

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  3. Unfolding of monomeric lipoprotein lipase by ANGPTL4: Insight into the regulation of plasma triglyceride metabolism

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  4. Crystal Structures of Human C4.4A Reveal the Unique Association of Ly6/uPAR/α-neurotoxin Domain

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The urokinase receptor urokinase-type plasminogen activator receptor (uPAR) is a surface receptor capable of not only focalizing urokinase-type plasminogen activator (uPA)-mediated fibrinolysis to the pericellular micro-environment but also promoting cell migration and chemotaxis. Consistent with this multifunctional role, uPAR binds several extracellular ligands, including uPA and vitronectin. Structural studies suggest that uPAR possesses structural flexibility. It is, however, not clear whether this flexibility is an inherent property of the uPAR structure per se or whether it is induced upon ligand binding. The crystal structure of human uPAR in its ligand-free state would clarify this issue, but such information remains unfortunately elusive. We now report the crystal structures of a stabilized, human uPAR (H47C/N259C) in its ligand-free form to 2.4 Å and in complex with amino-terminal fragment (ATF) to 3.2 Å. The structure of uPAR(H47C/N259C) in complex with ATF resembles the wild-type uPAR·ATF complex, demonstrating that these mutations do not perturb the uPA binding properties of uPAR. The present structure of uPAR(H47C/N259C) provides the first structural definition of uPAR in its ligand-free form, which represents one of the biologically active conformations of uPAR as defined by extensive biochemical studies. The domain boundary between uPAR DI-DII domains is more flexible than the DII-DIII domain boundary. Two important structural features are highlighted by the present uPAR structure. First, the DI-DIII domain boundary may face the cell membrane. Second, loop 130-142 of uPAR plays a dynamic role during ligand loading/unloading. Together, these studies provide new insights into uPAR structure-function relationships, emphasizing the importance of the inter-domain dynamics of this modular receptor.
Original languageEnglish
JournalJournal of Molecular Biology
Volume416
Issue number5
Pages (from-to)629-41
ISSN0022-2836
DOIs
Publication statusPublished - 2012

ID: 33286381