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J. Biol. Chem., Vol. 276, Issue 28, 26249-26259, July 13, 2001
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,
,
From the Department of Bioscience and Biotechnology and the
§ Department of Applied Genetics and Pest Management,
Graduate School of Bioresource and Bioenvironmental Sciences, Kyushu
University, 6-10-1 Hakozaki, Higashi-ku, Fukuoka 812-8581, Japan and
the Previously, we reported two types of neutral
ceramidase in mice, one solubilized by freeze-thawing and one not. The
former was purified as a 94-kDa protein from mouse liver, and cloned (Tani, M., Okino, N., Mori, K., Tanigawa, T., Izu, H., and Ito, M. (2000) J. Biol. Chem. 275, 11229-11234). In this
paper, we describe the purification, molecular cloning, and subcellular distribution of a 112-kDa membrane-bound neutral ceramidase of rat
kidney, which was completely insoluble by freeze-thawing. The open
reading frame of the enzyme encoded a polypeptide of 761 amino acids
having nine putative N-glycosylation sites and one possible
transmembrane domain. In the ceramidase overexpressing HEK293 cells,
133-kDa (Golgi-form) and 113-kDa (endoplasmic reticulum-form) Myc-tagged ceramidases were detected, whereas these two proteins were converted to a 87-kDa protein concomitantly with loss of activity
when expressed in the presence of tunicamycin, indicating that the
N-glycosylation process is indispensable for the expression of the enzyme activity. Immunohistochemical analysis clearly showed that the ceramidase was mainly localized at the apical membrane of
proximal tubules, distal tubules, and collecting ducts in rat kidney,
while in liver the enzyme was distributed with endosome-like organelles
in hepatocytes. Interestingly, the kidney ceramidase was found to be
enriched in the raft microdomains with cholesterol and GM1 ganglioside.
Mitsubishi Kasei Institute of Life Sciences, 11 Minamiooya, Machida 194-8511, Tokyo, Japan
The nucleotide sequence(s) reported in this paper has been submitted to the GenBankTM/EMBL Data Bank with accession number(s) AB057433.
¶ To whom all correspondence should be addressed: Dept. of Bioscience and Biotechnology, Graduate School of Bioresource and Bioenvironmental Sciences, Kyushu University, 6-10-1 Hakozaki, Higashi-ku, Fukuoka 812-8581, Japan. Fax: 81-92-642-2900 or 81-92-642-2907; E-mail: makotoi@agr.kyushu-u.ac.jp.This article has been cited by other articles:
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