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J. Biol. Chem., Vol. 275, Issue 28, 21295-21301, July 14, 2000
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From the Myocardial phospholipase D (PLD) has been
implicated in the regulation of Ca2+ mobilization and
contractile performance in the heart. However, the molecular identity
of this myocardial PLD and the mechanisms that regulate it are not well
understood. Using subcellular fractionation and Western blot analysis,
we found that PLD2 is the major myocardial PLD and that it localizes
primarily to sarcolemmal membranes. A 100-kDa PLD2-interacting cardiac
protein was detected using a protein overlay assay employing purified
PLD2 and then identified as
Cardiac Phospholipase D2 Localizes to Sarcolemmal
Membranes and Is Inhibited by
-Actinin in an ADP-ribosylation
Factor-reversible Manner*
,
,
,
,
,
, and
Department of Life Science and Division of
Molecular and Life Sciences, Pohang University of Science and
Technology, Pohang 790-784, Korea, the § Mass Spectrometry
Analysis Group, Korea Basic Science Institute, Taejon 305-333, Korea, and the ¶ Department of Pharmacology and the Institute for
Cell and Developmental Biology, State University of New York,
Stony Brook, New York 11794-8651
-actinin using peptide-mass
fingerprinting with matrix-assisted laser desorption/ionization mass
spectroscopy. The direct association between PLD2 and
-actinin was
confirmed using an in vitro binding assay and localized to
PLD2's N-terminal 185 amino acids. Purified
-actinin potently
inhibits PLD2 activity (IC50 = 80 nM) in an interaction-dependent and ADP-ribosylation
factor-reversible manner. Finally,
-actinin co-localizes with actin
and with PLD2 in the detergent-insoluble fraction from sarcolemmal
membranes. These results suggest that PLD2 is reciprocally regulated in
sarcolemmal membranes by
-actinin and ARF1 and accordingly that a
major role for PLD2 in cardiac function may involve reorganization of
the actin cytoskeleton.
*
This work was supported by grants from the National Research
Laboratory and Brain Research of Ministry of Science and Technology and
the Center for Cell Signalling Research in the Republic of Korea (to
S. H. R.) and by National Institutes of Health Grant GM54813
(to M. A. F.).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.:
82-562-279-5971; Fax: 82-562-279-2199; E-mail:
sungho@postech.ac.kr.
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