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Suzuki, T. et al.

Suzuki, Usuda, Ishiguro, Mitake, Nagatsu, Okumura-Noji,

Occurrence of a transcription factor, cAMP response element-binding protein (CREB), in the postsynaptic sites of the brain.

The postsynaptic density (PSD) fraction prepared from the rat forebrain contained a transcription factor, cAMP response element-binding protein (CREB). The occurrence of CREB in the PSD was confirmed by immunoelectron microscopic examination. CREB in the PSD fraction was phosphorylated both by protein kinase A and Ca2+/calmodulin-dependent protein kinase II (CaMKII) endogenous to the fraction, and dissociated from the PSD after phosphorylation, especially under CaMKII-activated conditions. The fraction containing CREB that was released from PSD after phosphorylation possessed cAMP response element (CRE)-binding activity. Thus, PSD anchors functionally active CREB. These results suggest that CREB anchored to the PSD is liberated by phosphorylation upon specific synaptic stimulation, translocates into the nucleus, and then triggers synaptic activity-dependent changes in gene expression.[1]

References

Occurrence of a transcription factor, cAMP response element-binding protein (CREB), in the postsynaptic sites of the brain. Suzuki, T., Usuda, N., Ishiguro, H., Mitake, S., Nagatsu, T., Okumura-Noji, K. Brain Res. Mol. Brain Res. (1998) [Pubmed]

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