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J. Biol. Chem., Vol. 275, Issue 28, 21532-21538, July 14, 2000
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From the Center for Biomembranes and Lipid Enzymology, Department
of Lipid Biochemistry, Institute of Biomembranes, Utrecht University,
Padualaan 8, 3584 CH Utrecht, The Netherlands
The charge isomers of bovine brain PI-TP
The Protein Kinase C-dependent Phosphorylation of
Serine 166 Is Controlled by the Phospholipid Species Bound to the
Phosphatidylinositol Transfer Protein
*
(i.e. PI-TP
I containing a phosphatidylinositol (PI)
molecule and PI-TP
II containing a phosphatidylcholine (PC) molecule)
were phosphorylated in vitro by rat brain protein kinase C
(PKC) at different rates. From the double-reciprocal plot, it was
estimated that the Vmax values for PI-TP
I
and II were 2.0 and 6.0 nmol/min, respectively; the Km values for both charge isomers were about equal,
i.e. 0.7 µM. Phosphorylation of charge
isomers of recombinant mouse PI-TP
confirmed that the PC-containing
isomer was the better substrate. Phosphoamino acid analysis of in
vitro and in vivo 32P-labeled PI-TP
s
showed that serine was the major site of phosphorylation. Degradation
of 32P-labeled PI-TP
by cyanogen bromide followed by
high pressure liquid chromatography and sequence analysis yielded one
32P-labeled peptide (amino acids 104-190). This peptide
contained Ser-148, Ser-152, and the consensus PKC phosphorylation site
Ser-166. Replacement of Ser-166 with an alanine residue confirmed that indeed this residue was the site of phosphorylation. This mutation completely abolished PI and PC transfer activity. This was also observed when Ser-166 was replaced with Asp, implying that this is a
key amino acid residue in regulating the function of PI-TP
. Stimulation of NIH3T3 fibroblasts by phorbol ester or platelet-derived growth factor induced the rapid relocalization of PI-TP
to
perinuclear Golgi structures concomitant with a 2-3-fold increase in
lysophosphatidylinositol levels. This relocalization was also observed
for Myc-tagged wtPI-TP
expressed in NIH3T3 cells. In contrast, the
distribution of Myc-tagged PI-TP
(S166A) and Myc-tagged
PI-TP
(S166D) were not affected by phorbol ester, suggesting that
phosphorylation of Ser-166 was a prerequisite for the relocalization to
the Golgi. A model is proposed in which the PKC-dependent
phosphorylation of PI-TP
is linked to the degradation of PI.
*
This work was supported by the Netherlands Organization for
Scientific Research.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.: 31-30-2534668;
Fax: 31-30-2522478; E-mail: g.t.snoek@chem.uu.nl.
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