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Originally published In Press as doi:10.1074/jbc.M011423200 on March 26, 2001
J. Biol. Chem., Vol. 276, Issue 24, 21434-21442, June 15, 2001
Prostasin Is a Glycosylphosphatidylinositol-anchored Active
Serine Protease*
Li-Mei
Chen ,
Melanie L.
Skinner ,
Steven W.
Kauffman ,
Julie
Chao§,
Lee
Chao§,
Catherine D.
Thaler¶, and
Karl X.
Chai
From the Department of Molecular Biology and
Microbiology and the ¶ Department of Biology, University of
Central Florida, Orlando, Florida 32816 and the § Department
of Biochemistry and Molecular Biology, Medical University of South
Carolina, Charleston, South Carolina 29425
A recombinant human prostasin serine protease was
expressed in several human cell lines. Subcellular fractionation showed that this serine protease is synthesized as a membrane-bound
protein while a free-form prostasin is secreted into the culture
medium. Prostasin was identified in nuclear and membrane fractions.
Membrane-bound prostasin can be released by
phosphatidylinositol-specific phospholipase C treatment, or labeled by
[3H]ethanolamine, indicating a
glycosylphosphatidylinositol anchorage. A prostasin-binding protein was
identified in mouse and human seminal vesicle fluid. Both the secreted
and the membrane-bound prostasin were able to form a covalently linked
82-kDa complex when incubated with seminal vesicle fluid. The complex
formation between prostasin and the prostasin-binding protein was
inhibited by a prostasin antibody, heparin, and serine protease
inhibitors. Prostasin's serine protease activity was inhibited when
bound to the prostasin-binding protein in mouse seminal vesicle fluid. This study indicates that prostasin is an active serine protease in its
membrane-bound form.
*
This work was supported by Department of Defense Prostate
Cancer Research Program Grant DAMD17-98-1-8590.The costs of publication of this
article were defrayed in part by the
payment of page charges. The article
must therefore be hereby marked
"advertisement" in accordance with 18 U.S.C. Section
1734 solely to indicate this fact.
To whom correspondence should be addressed: Dept. of Molecular
Biology and Microbiology, University of Central Florida, 4000 Central
Florida Blvd., Orlando, FL 32816-2360. Tel.: 407-823-6122; Fax:
407-823-3095; E-mail: kxchai@mail.ucf.edu.
Copyright © 2001 by The American Society for Biochemistry and Molecular Biology, Inc.

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Copyright © 2001 by the American Society for Biochemistry and Molecular Biology.
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