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J. Biol. Chem., Vol. 277, Issue 28, 25512-25518, July 12, 2002
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From the Sphingolipids desaturated at the The nucleotide sequence(s) reported in this paper has been submitted to the GenBankTM/EBI Data Bank with accession number(s) AF466375 (H. sapiens DES1), AF466376 (M. musculus DES1), AF466377 (M. musculus DES2), AF466378 (DES homologue L. esculentum),
and AF466379 (D. melanogaster DES-1).
Identification and Characterization of a Sphingolipid
4-Desaturase Family*
,
, and
Institut für Allgemeine Botanik,
Universität Hamburg, Ohnhorststr. 18, D-22609 Hamburg,
Germany, the § Organische Mikroanalytik, Institut
für Organische Chemie, Universität Hamburg,
Martin-Luther-King-Platz 6, D-20146 Hamburg, Germany, and the
¶ Laborgruppe Immunchemie, Forschungszentrum Borstel, Parkallee
22, D-23845 Borstel, Germany
4-position
are important signaling molecules in many eukaryotic organisms,
including mammals. In a bioinformatics approach, we now identified a
new family of protein sequences from animals, plants, and fungi and
characterized these sequences biochemically by expression in
Saccharomyces cerevisiae. This resulted in the
identification of the enzyme sphingolipid
4-desaturase
(dihydroceramide desaturase) from Homo sapiens, Mus
musculus, Drosophila melanogaster, and
Candida albicans, in addition to a bifunctional
sphingolipid
4-desaturase/C-4-hydroxylase from M. musculus. Among the sequences investigated are the Homo sapiens membrane lipid desaturase, the M. musculus degenerative spermatocyte, and the Drosophila
melanogaster degenerative spermatocyte proteins. During
spermatogenesis, but not oogenesis of des mutant flies,
both cell cycle and spermatid differentiation are specifically blocked
at the entry into the first meiotic division, leading to male
sterility. This mutant phenotype can be restored to wild-type by
complementation with a functional copy of the des gene
(Endo, K., Akiyama, T., Kobayashi S., and Okada, M. (1996) Mol.
Gen. Genet. 253, 157-165). These results suggest that
4-desaturated sphingolipids provide an early signal necessary to
trigger the entry into both meiotic and spermatid differentiation
pathways during Drosophila spermatogenesis.
*
This work was supported by Deutsche
Forschungsgemeinschaft Grant He 695/15-1. Sequencing of C. albicans was accomplished with the support of the NIDR National
Institutes of Health and the Burroughs Wellcome Fund.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. Tel.:
49-40-42816-369; Fax: 49-40-42816-254; E-mail:
eheinz@botanik.uni-hamburg.de.
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