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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Schulman, Howard Meyer, Tobias Bradshaw, J. Michael Kubota, Yoshi |
| Description | Author Affiliation: Bradshaw JM ( Department of Neurobiology, Stanford University School of Medicine, Stanford, CA 94305, USA. michael.bradshaw@stanford.edu); |
| Abstract | The strength of hippocampal synapses can be persistently increased by signals that activate Ca2+/calmodulin-dependent protein kinase II (CaMKII). This CaMKII-dependent long-term potentiation is important for hippocampal learning and memory. In this work we show that CaMKII exhibits an intriguing switch-like activation that likely is important for changes in synaptic strength. We found that autophosphorylation of CaMKII by itself showed a steep dependence on Ca2+ concentration [Hill coefficient (nH) approximately 5]. However, an even steeper Ca2+ dependence (nH approximately 8) was observed when autophosphorylation is balanced by the dephosphorylation activity of protein phosphatase 1 (PP1). This autophosphorylation-dephosphorylation switch was found to be reversible because PP1 dephosphorylates CaMKII when Ca2+ is lowered to a basal level. The switch-like response of a CaMKII-PP1 system suggests that CaMKII and PP1 may function together as a simple molecular device that specifically translates only strong Ca2+ signals into all-or-none potentiation of individual hippocampal synapses. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 18 |
| Volume Number | 100 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 2003-09-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Calcium Signaling Physiology Calcium-Calmodulin-Dependent Protein Kinases Phosphoprotein Phosphatases Synapses Calcium-Calmodulin-Dependent Protein Kinase Type 2 Hippocampus Phosphorylation Protein Phosphatase 1 Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, P.H.S. Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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