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J. Biol. Chem., Vol. 277, Issue 30, 27412-27422, July 26, 2002
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From the The relationship between the ability of isolated
pleckstrin homology (PH) domains to bind inositol lipids or soluble
inositol phosphates in vitro and to localize to cellular
membranes in live cells was examined by comparing the PH domains of
phospholipase C
Inositol Lipid Binding and Membrane Localization of
Isolated Pleckstrin Homology (PH) Domains
STUDIES ON THE PH DOMAINS OF PHOSPHOLIPASE C
1
AND p130*
,
,
,
,
,
,
§§
Endocrinology and Reproduction Research
Branch, NICHD, National Institutes of Health,
Bethesda, Maryland 20892, the § Department of Pathology,
Anatomy and Cell Biology, Thomas Jefferson University,
Philadelphia, Pennsylvania 19107,
Laboratory of Biochemistry,
NHLBI, National Institutes of Health, Bethesda, Maryland 20892, and
** Department of Physiology and Laboratory of Cellular and
Molecular Physiology, Semmelweis University Medical School,
H-1444 Budapest, Hungary
1 (PLC
1) and the recently
cloned PLC-like protein p130 fused to the green fluorescent protein
(GFP). The prominent membrane localization of PLC
1PH-GFP
was paralleled with high affinity binding to inositol
1,4,5-trisphosphate (InsP3) as well as to phosphatidylinositol 4,5-bisphosphate-containing lipid vesicles or
nitrocellulose membrane strips. In contrast, no membrane localization was observed with p130PH-GFP despite its InsP3 and
phosphatidylinositol 4,5-bisphosphate-binding properties being
comparable with those of PLC
1PH-GFP. The N-terminal
ligand binding domain of the type I InsP3 receptor also
failed to localize to the plasma membrane despite its 5-fold higher
affinity to InsP3 than the PH domains. By using a chimeric
approach and cassette mutagenesis, the C-terminal
-helix and the
short loop between the
6-
7 sheets of the PLC
1PH domain, in addition to its InsP3-binding region, were
identified as critical components for membrane localization in intact
cells. These data indicate that binding to the inositol phosphate head group is necessary but may not be sufficient for membrane localization of the PLC
1PH-GFP fusion protein, and motifs located
within the C-terminal half of the PH domain provide auxiliary contacts
with additional membrane components.
*
This work was supported in part by Mobility Grant TeT
181/MO/01 from the United States-Hungarian Joint Fund (to P. V. and T. B.).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.

Supported by the Hungarian National Science Foundation Grant
OTKA T-032270.
§§
To whom correspondence should be addressed: Rm. 6A35, Bldg.
49, 49 Convent Dr., National Institutes of Health, Bethesda, MD 20892-4510. Tel.: 301-496-2136; Fax: 301-480-8010; E-mail:
tambal@box-t.nih.gov.
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