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Originally published In Press as doi:10.1074/jbc.M302742200 on May 29, 2003
J. Biol. Chem., Vol. 278, Issue 35, 33194-33199, August 29, 2003
Biosynthetic Processing of Cathepsins and Lysosomal Degradation Are Abolished in Asparaginyl Endopeptidase-deficient Mice*
Kanae Shirahama-Noda ,
Akitsugu Yamamoto ¶,
Kazushi Sugihara ||,
Noriyoshi Hashimoto ||,
Masahide Asano ||,
Mikio Nishimura and
Ikuko Hara-Nishimura ** 
From the
Department of Cell Biology, National
Institute for Basic Biology, Okazaki 444-8585, Japan,
Department of Physiology, Kansai Medical
University, Moriguchi 570-8506, Japan, ||Graduate
School of Medical Science, Kanazawa University, Kanazawa 920-8640, Japan, and
**Graduate School of Science, Kyoto University,
Kitashirakawa, Sakyo-ku, Kyoto 606-8502, Japan
Asparaginyl endopeptidase (AEP)/legumain, an asparagine-specific cysteine
proteinase in animals, is an ortholog of plant vacuolar processing enzyme
(VPE), which processes the exposed asparagine residues of various vacuolar
proteins. In search for its physiological role in mammals, here we generated
and characterized AEP-deficient mice. Although their body weights were
significantly reduced, they were normally born and fertile. In the wild-type
kidney where the expression of AEP was exceedingly high among various organs,
the localization of AEP was mainly found in the lamp-2-positive late endosomes
in the apical region of the proximal tubule cells. In these cells of
AEP-deficient mice, the lamp-2-positive membrane structures were found to be
greatly enlarged. These aberrant lysosomes, merged with the late endosomes,
accumulated electron-dense and membranous materials. Furthermore, the
processing of the lysosomal proteases, cathepsins B, H, and L, from the
single-chain forms into the two-chain forms was completely defected in the
deficient mice. Thus, the AEP deficiency caused the accumulation of
macromolecules in the lysosomes, highlighting a pivotal role of AEP in the
endosomal/lysosomal degradation system.
Received for publication, March 18, 2003
, and in revised form, May 20, 2003.
* This work has been supported in part by CREST of Japan Science and
Technology Corporation and Grant-in-aid 12138205 for Scientific Research from
the Ministry of Education, Culture, Sports, Science and Technology of Japan.
The costs of publication of this article were defrayed in part by the payment
of page charges. This article must therefore be hereby marked
"advertisement" in accordance with 18 U.S.C. Section 1734
solely to indicate this fact.
¶ Present address: Nagahama Institute of Bio-Science and Technology, Nagahama
526-0829, Japan.

To whom correspondence should be addressed. Tel./Fax: 81-75-753-4142; E-mail:
ihnishi{at}gr.bot.kyoto-u.ac.jp.

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Copyright © 2003 by the American Society for Biochemistry and Molecular Biology.
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