Dynamic control of CaMKII translocation and localization in hippocampal neurons by NMDA receptor stimulation.
Calcium-calmodulin-dependent protein kinase II (CaMKII) is thought to increase synaptic strength by phosphorylating postsynaptic density (PSD) ion channels and signaling proteins. It is shown that N-methyl-D-aspartate (NMDA) receptor stimulation reversibly translocates green fluorescent protein-tagged CaMKII from an F-actin-bound to a PSD-bound state. The translocation time was controlled by the ratio of expressed beta-CaMKII to alpha-CaMKII isoforms. Although F-actin dissociation into the cytosol required autophosphorylation of or calcium-calmodulin binding to beta-CaMKII, PSD translocation required binding of calcium-calmodulin to either the alpha- or beta-CaMKII subunits. Autophosphorylation of CaMKII indirectly prolongs its PSD localization by increasing the calmodulin-binding affinity.
Shen
K
K
Department of Cell Biology and Department of Pharmacology and Cancer Biology, Box 3709, Duke University Medical Center, Durham, NC 27710, USA.
Meyer
T
T
D000199:Actins / Q000378:metabolism; D000818:Animals; D002118:Calcium / Q000494:pharmacology; D054732:Calcium-Calmodulin-Dependent Protein Kinase Type 2; D017871:Calcium-Calmodulin-Dependent Protein Kinases / Q000378:metabolism*; D002478:Cells, Cultured; D003600:Cytosol / Q000378:metabolism; D003712:Dendrites / Q000201:enzymology*; D004558:Electric Stimulation; D018698:Glutamic Acid / Q000494:pharmacology; D049452:Green Fluorescent Proteins; D006624:Hippocampus / Q000166:cytology / Q000201:enzymology*; D007527:Isoenzymes / Q000378:metabolism; D008164:Luminescent Proteins; D008856:Microscopy, Fluorescence; D009419:Nerve Tissue Proteins / Q000032:analysis; D009474:Neurons / Q000201:enzymology*; D010766:Phosphorylation; D051381:Rats; D016194:Receptors, N-Methyl-D-Aspartate / Q000378:metabolism*; D013569:Synapses / Q000201:enzymology*; D014407:Tumor Cells, Cultured
D000199:Actins; D007527:Isoenzymes; D008164:Luminescent Proteins; D009419:Nerve Tissue Proteins; D016194:Receptors, N-Methyl-D-Aspartate; C033652:postsynaptic density proteins; D049452:Green Fluorescent Proteins; D018698:Glutamic Acid; D054732:Calcium-Calmodulin-Dependent Protein Kinase Type 2; D017871:Calcium-Calmodulin-Dependent Protein Kinases; D002118:Calcium