TY - JOUR
T1 - Characterization of the targeting, binding, and phosphorylation site domains of an a kinase anchor protein and a myristoylated alanine-rich C kinase substrate-like analog that are encoded by a single gene
AU - Rossi, Edmund A.
AU - Li, Zhuo
AU - Feng, Hui
AU - Rubin, Charles S.
PY - 1999/9/17
Y1 - 1999/9/17
N2 - A novel Drosophila A kinase anchor protein, Drosophila A kinase anchor protein 200 (DAKAP200), is predicted to be involved in routing, mediating, and integrating signals carried by cAMP, Ca2+, and diacylglycerol (Li, Z., Rossi, E. A., Hoheisel, J. D., Kalderon, D., and Rubin, C. S. (1999) J. Biol. Chem. 274, 27191-27200). Experiments designed to assess this hypothesis now (a) establish the function, boundaries and identity of critical amino acids of the protein kinase AII (PKAII) tethering site of DAKAP200; (b) demonstrate that residues 119-148 mediate binding with Ca2+-calmodulin and F-actin; (c) show that a polybasic region of DAKAP200 is a substrate for protein kinase C; (d) reveal that phosphorylation of the polybasic domain regulates affinity for F-actin and Ca2+-calmodulin; and (e) indicate that DAKAP200 is myristoylated and that this modification promotes targeting of DAKAP200 to plasma membrane. ΔAKAP200, a second product of the DAKAP200 gene, cannot tether PKAII. However, ΔAKAP200 is myristoylated and contains a phosphorylation site domain that binds Ca2+-calmodulin and F-actin. An atypical amino acid composition, a high level of negative charge, exceptional thermostability, unusual hydrodynamic properties, properties of the phosphorylation site domain, and a calculated M(r) of 38,000 suggest that ΔAKAP200 is a new member of the myristoylated alanine-rich C kinase substrate protein family. DAKAP200 is a potentially mobile, chimeric A kinase anchor protein-myristoylated alanine-rich C kinase substrate protein that may facilitate localized reception and targeted transmission of signals carried by cAMP, Ca2+, and diacylglycerol.
AB - A novel Drosophila A kinase anchor protein, Drosophila A kinase anchor protein 200 (DAKAP200), is predicted to be involved in routing, mediating, and integrating signals carried by cAMP, Ca2+, and diacylglycerol (Li, Z., Rossi, E. A., Hoheisel, J. D., Kalderon, D., and Rubin, C. S. (1999) J. Biol. Chem. 274, 27191-27200). Experiments designed to assess this hypothesis now (a) establish the function, boundaries and identity of critical amino acids of the protein kinase AII (PKAII) tethering site of DAKAP200; (b) demonstrate that residues 119-148 mediate binding with Ca2+-calmodulin and F-actin; (c) show that a polybasic region of DAKAP200 is a substrate for protein kinase C; (d) reveal that phosphorylation of the polybasic domain regulates affinity for F-actin and Ca2+-calmodulin; and (e) indicate that DAKAP200 is myristoylated and that this modification promotes targeting of DAKAP200 to plasma membrane. ΔAKAP200, a second product of the DAKAP200 gene, cannot tether PKAII. However, ΔAKAP200 is myristoylated and contains a phosphorylation site domain that binds Ca2+-calmodulin and F-actin. An atypical amino acid composition, a high level of negative charge, exceptional thermostability, unusual hydrodynamic properties, properties of the phosphorylation site domain, and a calculated M(r) of 38,000 suggest that ΔAKAP200 is a new member of the myristoylated alanine-rich C kinase substrate protein family. DAKAP200 is a potentially mobile, chimeric A kinase anchor protein-myristoylated alanine-rich C kinase substrate protein that may facilitate localized reception and targeted transmission of signals carried by cAMP, Ca2+, and diacylglycerol.
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U2 - 10.1074/jbc.274.38.27201
DO - 10.1074/jbc.274.38.27201
M3 - Article
C2 - 10480937
AN - SCOPUS:0033578731
SN - 0021-9258
VL - 274
SP - 27201
EP - 27210
JO - Journal of Biological Chemistry
JF - Journal of Biological Chemistry
IS - 38
ER -