Literature DB >> 17548057

Serotonin induces selective cleavage of the PKA RI subunit but not RII subunit in Aplysia neurons.

Takeshi Kurosu1, A Iván Hernández, James H Schwartz.   

Abstract

PKA type I and type II are activated in Aplysia neurons by stimulation with serotonin (5-HT), which causes long-term facilitation (LTF). The proteolysis of the regulatory subunit (R) is thought important for the persistent activation of PKA, which is necessary to produce LTF. In this study, we report that the type I regulatory subunit (RI) and type II regulatory subunit (RII) are differentially regulated by proteolytic cleavage. RI, but not RII, was selectively cleaved after 5-HT treatment for 2h in Aplysia neurons. Interestingly, the proteasome inhibitor MG132 inhibited the cleavage of RI caused by 5-HT treatment in Aplysia neuron. Besides extracts from Aplysia ganglia treated with 5-HT cleaved (35)S-labeled RI synthesized in vitro, but not (35)S-labeled RII. This suggests that 5-HT induces the activation state of RI-specific proteolytic cleavage.

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Year:  2007        PMID： 17548057      PMCID： PMC1994154          DOI： 10.1016/j.bbrc.2007.05.146

Source DB:  PubMed          Journal:  Biochem Biophys Res Commun        ISSN： 0006-291X            Impact factor:   3.575


  28 in total

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