Novel interactions between urokinase and its receptor

被引:28
作者
Shliom, O
Huang, M
Sachais, B
Kuo, A
Weisel, JW
Nagaswami, C
Nassar, T
Bdeir, K
Hiss, E
Gawlak, S
Harris, S
Mazar, A
Higazi, AA
机构
[1] Univ Penn, Dept Pathol & Lab Med, Philadelphia, PA 19104 USA
[2] Univ Penn, Dept Cell & Dev Biol, Philadelphia, PA 19104 USA
[3] Hebrew Univ Jerusalem, Hadassah Med Ctr, Dept Clin Biochem, IL-91120 Jerusalem, Israel
[4] Beth Israel Deaconess Med Ctr, Ctr Thrombosis & Hemostasis Res, Boston, MA 02215 USA
[5] Harvard Univ, Sch Med, Boston, MA 02115 USA
[6] Angstrom Pharmaceut Inc, Dept Biol, San Diego, CA 92121 USA
关键词
D O I
10.1074/jbc.M002024200
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Urokinase-type plasminogen activator (uPA) binds to its receptor (uPAR) with a K-d of about 1 nM. The catalytic activity of the complex is apparent at uPA concentrations close to K-d. Other functions of the complex, such as signal transduction, are apparent at much higher concentrations (35-60 nM). In the present study, we show that uPA and recombinant soluble uPAR (suPAR), at concentrations that exceed the K-d and the theoretical saturation levels (10-80 nM), establish novel interactions that lead to a further increase in the activity of the single-chain uPA (scuPA)/suPAR and two-chain uPA (tcuPA)/suPAR complexes. Experiments performed using dynamic light scattering, gel filtration, and electron microscopy techniques indicate that suPAR forms dimers and oligomers, The three techniques provide evidence that the addition of an equimolar concentration of scuPA leads to the dissociation of these dimers and oligomers, Biacore data show that suPAR dimers and oligomers bind scuPA with decreased affinity when compared with monomers, We postulate that uPAR. is present in equilibrium between oligomer/dimer/monomer forms. The binding of uPA to suPAR dimers and oligomers occurs with lower affinity than the binding to monomer. These novel interactions regulate the activity of the resultant complexes and may be involved in uPA/uPAR mediated signal transduction.
引用
收藏
页码:24304 / 24312
页数:9
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