Multimerization of the cytoplasmic domain of syndecan-4 is required for its ability to activate protein kinase C.
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Multimerization of the cytoplasmic domain of syndecan-4 is required for its ability to activate protein kinase C. / Oh, E S; Woods, A; Couchman, J R.
In: Journal of Biological Chemistry, Vol. 272, No. 18, 1997, p. 11805-11.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Multimerization of the cytoplasmic domain of syndecan-4 is required for its ability to activate protein kinase C.
AU - Oh, E S
AU - Woods, A
AU - Couchman, J R
N1 - Keywords: Adenosine Triphosphate; Amino Acid Sequence; Animals; Brain; Chromatography, Gel; Cloning, Molecular; Cytoplasm; Enzyme Activation; Isoenzymes; Kinetics; Macromolecular Substances; Membrane Glycoproteins; Molecular Sequence Data; Peptide Fragments; Protein Hybridization; Protein Kinase C; Protein Kinase C-alpha; Proteoglycans; Rabbits; Recombinant Fusion Proteins; Recombinant Proteins; Structure-Activity Relationship; Syndecan-4
PY - 1997
Y1 - 1997
N2 - The transmembrane proteoglycan syndecan-4, which is a coreceptor with integrins in cytoskeleton-matrix interactions, appears to be multimerized in vivo. Both purified and recombinant core proteins form sodium dodecyl sulfate-resistant oligomers, and we now report that a synthetic peptide corresponding to the central region of syndecan-4 cytoplasmic domain (4V) also oligomerizes. The degree of oligomerization correlates with the previously reported ability to bind protein kinase C (PKC) and regulate its activity. Only multimeric recombinant syndecan-4 core protein, but not the monomeric protein, potentiated the activity of PKCalpha, and only oligomeric syndecan-4 cytoplasmic peptides were active. Changes in peptide sequence caused parallel loss of stable oligomeric status and ability to regulate a mixture of PKCalphabetagamma activity. A synthetic peptide encompassing the whole cytoplasmic domain of syndecan-4 (4L) containing a membrane-proximal basic sequence did not form higher order oligomers and could not regulate the activity of PKCalphabetagamma unless induced to aggregate by phosphatidylinositol 4,5-bisphosphate. Oligomerization and PKC regulatory activity of the 4V peptide were both increased by addition of N-terminal cysteine and reduced by phosphorylation of the cysteine thiol group. Concentration of syndecan-4 at sites of focal adhesion formation may enhance multimerization and both localize PKC and potentiate its activity to induce stable complex formation.
AB - The transmembrane proteoglycan syndecan-4, which is a coreceptor with integrins in cytoskeleton-matrix interactions, appears to be multimerized in vivo. Both purified and recombinant core proteins form sodium dodecyl sulfate-resistant oligomers, and we now report that a synthetic peptide corresponding to the central region of syndecan-4 cytoplasmic domain (4V) also oligomerizes. The degree of oligomerization correlates with the previously reported ability to bind protein kinase C (PKC) and regulate its activity. Only multimeric recombinant syndecan-4 core protein, but not the monomeric protein, potentiated the activity of PKCalpha, and only oligomeric syndecan-4 cytoplasmic peptides were active. Changes in peptide sequence caused parallel loss of stable oligomeric status and ability to regulate a mixture of PKCalphabetagamma activity. A synthetic peptide encompassing the whole cytoplasmic domain of syndecan-4 (4L) containing a membrane-proximal basic sequence did not form higher order oligomers and could not regulate the activity of PKCalphabetagamma unless induced to aggregate by phosphatidylinositol 4,5-bisphosphate. Oligomerization and PKC regulatory activity of the 4V peptide were both increased by addition of N-terminal cysteine and reduced by phosphorylation of the cysteine thiol group. Concentration of syndecan-4 at sites of focal adhesion formation may enhance multimerization and both localize PKC and potentiate its activity to induce stable complex formation.
M3 - Journal article
C2 - 9115237
VL - 272
SP - 11805
EP - 11811
JO - Journal of Biological Chemistry
JF - Journal of Biological Chemistry
SN - 0021-9258
IS - 18
ER -
ID: 5164692