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J Biol Chem, Vol. 273, Issue 8, 4790-4799, February 20, 1998
From the Cancer Biology Research Group, Department of Medical
Biochemistry, University of Calgary, Calgary,
Alberta T2N 4N1, Canada
Annexin II tetramer (AIIt) is a major
Ca2+-binding protein of endothelial cells which has
been shown to exist on both the intracellular and extracellular
surfaces of the plasma membrane. In this report, we demonstrate that
AIIt stimulates the activation of plasminogen by facilitating the
tissue plasminogen activator (t-PA)-dependent conversion of
plasminogen to plasmin. Fluid-phase AIIt stimulated the rate of
activation of [Glu]plasminogen about 341-fold compared with an
approximate 6-fold stimulation by annexin II. AIIt bound to
[Glu]plasminogen(S741C-fluorescein) with a Kd of
1.26 ± 0.04 µM (mean ± S.D.,
n = 3) and this interaction resulted in a large
conformational change in [Glu]plasminogen. Kinetic analysis established that AIIt produces a large increase of about 190-fold in
the kcat, app and a small increase in the
Km,app which resulted in a 90-fold
increase in the catalytic efficiency (kcat/Km) of t-PA for
[Glu]plasminogen. AIIt also stimulated the t-PA-dependent
activation of [Lys]plasminogen about 28-fold. Furthermore, other
annexins such as annexin I, V, or VI did not produce comparable
activation of t-PA-dependent conversion of [Glu]plasminogen to plasmin. The stimulation of the activation of
[Glu]plasminogen by AIIt was Ca2+-independent and
inhibited by
The Role of Annexin II Tetramer in the Activation of
Plasminogen
-aminocaproic acid. AIIt bound to human 293 cells
potentiated t-PA-dependent plasminogen activation. AIIt
that was bound to phospholipid vesicles or heparin also stimulated the
activation of [Glu]plasminogen 5- or 11-fold, respectively. Furthermore, immunofluorescence labeling of nonpermeabilized HUVEC revealed a punctated distribution of AIIt subunits on the cell surface.
These results therefore identify AIIt as a potent in vitro
activator of plasminogen.
Copyright © 1998 by The American Society for Biochemistry and Molecular Biology, Inc.
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