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(Received for publication, December 20, 1996)
From the Diacylglycerol kinase (DGK) attenuates levels of
second messenger diacylglycerol in cells and produces another
(putative) messenger, phosphatidic acid. We have previously purified a
110-kDa DGK from rat brain (Kato, M., and Takenawa, T. (1990)
J. Biol. Chem. 265, 794-800). Here we report the
cDNA cloning from human brain and retina cDNA libraries. The
cDNA encodes a novel DGK isotype, termed DGK
Volume 272, Number 16,
Issue of April 18, 1997
pp. 10422-10428
©1997 by The American Society for Biochemistry and Molecular Biology, Inc.
)
Containing Three Cysteine-rich Domains, a Proline-rich Region, and
a Pleckstrin Homology Domain with an Overlapping Ras-associating
Domain
,
,
,
,
,
Division of Cellular Biochemistry,
Netherlands Cancer Institute, Plesmanlaan 121, 1066 CX Amsterdam,
The Netherlands, the
Department of Anatomy, Tohoku University
School of Medicine, Sendai 980, Japan, and the ** Department of
Biochemistry, Institute of Medical Science, University of Tokyo, Tokyo
108, Japan
, of 941 amino acids
with an apparent molecular mass of 110 kDa. DGK
contains a
C-terminal putative catalytic domain, which is present in all
eukaryotic DGKs. In contrast to other DGK isotypes, DGK
contains
three cysteine-rich domains instead of two. The third cysteine-rich
domain is most homologous to the second one in other DGK isotypes. This
particular sequence homology extends C-terminally beyond the typical
cysteine/histidine core structure and is DGK-specific. DGK
furthermore contains various domains for protein-protein interaction,
such as a proline- and glycine-rich domain with a putative SH3
domain-binding site and a pleckstrin homology domain with an
overlapping Ras-associating domain. DGK
is expressed in the brain
and, to a lesser extent, in the small intestine, duodenum, and liver.
In situ hybridization of DGK
mRNA in adult rat brain
reveals high expression in the cerebellar cortex and hippocampus.
DGK
activity in COS cell lysates is optimal toward diacylglycerols
containing an unsaturated fatty acid at the sn-2
position.
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