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(Received for publication, September 5, 1996)
From the Laboratory of Pathology, Division of Clinical Sciences,
NCI, National Institutes of Health, Bethesda, Maryland 20892
Autotaxin (ATX) is an extracellular enzyme and an
autocrine motility factor that stimulates pertussis toxin-sensitive
chemotaxis in human melanoma cells at picomolar to nanomolar
concentrations. This 125-kDa glycoprotein contains a peptide sequence
identified as the catalytic site in type I alkaline phosphodiesterases
(PDEs), and it possesses 5
Volume 272, Number 2,
Issue of January 10, 1997
pp. 996-1001
©1997 by The American Society for Biochemistry and Molecular Biology, Inc.
-Nucleotide
Phosphodiesterase/ATP Pyrophosphatase and ATPase Activities
-nucleotide PDE (EC 3.1.4.1) activity
(Stracke, M. L., Krutzsch, H. C., Unsworth, E. J., Årestad, A., Cioce,
V., Schiffmann, E., and Liotta, L. (1992) J. Biol.
Chem. 267, 2524-2529; Murata, J., Lee, H. Y., Clair, T.,
Krutsch, H. C., Årestad, A. A., Sobel, M. E., Liotta, L. A., and
Stracke, M. L. (1994) J. Biol. Chem. 269, 30479-30484). ATX binds ATP and is phosphorylated only on threonine.
Thr210 at the PDE active site of ATX is required for
phosphorylation, 5
-nucleotide PDE, and motility-stimulating activities
(Lee, H. Y., Clair, T., Mulvaney, P. T., Woodhouse, E. C., Aznavoorian, S., Liotta, L. A., and Stracke, M. L. (1996) J. Biol.
Chem. 271, 24408-24412). In this article we report that the
phosphorylation of ATX is a transient event, being stable at 0 °C
but unstable at 37 °C, and that ATX has adenosine-5
-triphosphatase
(ATPase; EC 3.6.1.3) and ATP pyrophosphatase (EC 3.6.1.8) activities. Thus ATX catalyzes the hydrolysis of the phosphodiester bond on either
side of the
-phosphate of ATP. ATX also catalyzes the hydrolysis of
GTP to GDP and GMP, of either AMP or PPi to Pi, and the hydrolysis of NAD to AMP, and each of these substrates can
serve as a phosphate donor in the phosphorylation of ATX. ATX possesses
no detectable protein kinase activity toward histone, myelin basic
protein, or casein. These results lead to the proposal that ATX is
capable of at least two alternative reaction mechanisms, threonine
(T-type) ATPase and 5
-nucleotide PDE/ATP pyrophosphatase, with a
common site (Thr210) for the formation of covalently bound
reaction intermediates threonine phosphate and threonine adenylate,
respectively.
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