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Originally published In Press as doi:10.1074/jbc.M102908200 on June 8, 2001
J. Biol. Chem., Vol. 276, Issue 31, 29051-29058, August 3, 2001
Biochemical Studies of Zmpste24-deficient Mice*
Gordon K.
Leung §¶ ,
Walter K.
Schmidt **,
Martin O.
Bergo § ,
Bryant
Gavino ,
Darren H.
Wong ,
Amy
Tam**,
Matthew N.
Ashby ,
Susan
Michaelis**, and
Stephen G.
Young §¶§§
From the Gladstone Institute of Cardiovascular
Disease, § Cardiovascular Research Institute, and
¶ Department of Medicine, University of California, San
Francisco, California 94141-9100, the ** Department of Cell Biology and
Anatomy, The Johns Hopkins University School of Medicine, Baltimore,
Maryland 21205, and  Axys Pharmaceuticals,
South San Francisco, California 94080
Genetic studies in Saccharomyces
cerevisiae identified two genes, STE24 and
RCE1, involved in cleaving the three
carboxyl-terminal amino acids from isoprenylated proteins that
terminate with a CAAX sequence motif. Ste24p cleaves the
carboxyl-terminal "-AAX" from the yeast mating
pheromone a-factor, whereas Rce1p cleaves the -AAX
from both a-factor and Ras2p. Ste24p also cleaves the amino terminus of a-factor. The mouse genome contains
orthologues for both yeast RCE1 and STE24. We
previously demonstrated, with a gene-knockout experiment, that mouse
Rce1 is essential for development and that Rce1 is entirely
responsible for the carboxyl-terminal proteolytic processing of the
mouse Ras proteins. In this study, we cloned mouse
Zmpste24, the orthologue for yeast STE24 and
showed that it could promote a-factor production when
expressed in yeast. Then, to assess the importance of
Zmpste24 in development, we generated
Zmpste24-deficient mice. Unlike the Rce1
knockout mice, Zmpste24-deficient mice survived development
and were fertile. Since no natural substrates for mammalian Zmpste24
have been identified, yeast a-factor was used as a
surrogate substrate to investigate the biochemical activities in
membranes from the cells and tissues of Zmpste24-deficient
mice. We demonstrate that Zmpste24-deficient mouse membranes, like
Ste24p-deficient yeast membranes, have diminished CAAX
proteolytic activity and lack the ability to cleave the amino terminus
of the a-factor precursor. Thus, both enzymatic activities of yeast Ste24p are conserved in mouse Zmpste24, but these enzymatic activities are not essential for mouse development or for fertility.
*
This work was supported in part by National Institutes of
Health Grants HL41633 and AG15451 (to S. G. Y.) and GM41223
(to S. M.), a Howard Hughes Medical Institute Postdoctoral
Fellowship for Physicians (to G. K. L.), and grant awards
from the University of California Tobacco-related Disease Research
Program (to M. O. B. and S. G. Y.).
Contributed equally to the results of this work.
§§
To whom reprint requests should be addressed: Gladstone Institute
of Cardiovascular Disease, P. O. Box 419100, San Francisco, CA
94141-9100. Tel.: 415-695-3774; Fax: 415-285-5632; E-mail: syoung@
gladstone.ucsf.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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