Preprint: Histone acetyltransferase activity of CREB-binding protein is essential for synaptic plasticity in Lymnaea

Hatakeyama, D., Sunada, H., Totani, Y., Watanabe, T., Felletár, I., Fitchett, A., Eravci, M., Anagnostopoulou, A., Miki, R., Kuzuhara, T., Kemenes, I., Ito, E. and Kemenes, G. 2021. Preprint: Histone acetyltransferase activity of CREB-binding protein is essential for synaptic plasticity in Lymnaea. biorxiv.org. https://doi.org/10.1101/2021.05.26.445902

TitlePreprint: Histone acetyltransferase activity of CREB-binding protein is essential for synaptic plasticity in Lymnaea
AuthorsHatakeyama, D., Sunada, H., Totani, Y., Watanabe, T., Felletár, I., Fitchett, A., Eravci, M., Anagnostopoulou, A., Miki, R., Kuzuhara, T., Kemenes, I., Ito, E. and Kemenes, G.
Description

In eukaryotes, CREB-binding protein (CBP), a coactivator of CREB, functions both as a platform for recruiting other components of the transcriptional machinery and as a histone acetyltransferase (HAT) that alters chromatin structure. We previously showed that the transcriptional activity of cAMP-responsive element binding protein (CREB) plays a crucial role in neuronal plasticity in the pond snail Lymnaea stagnalis. However, there is no information on the role CBP plays in CREB-initiated plastic changes in Lymnaea. In this study, we characterized the Lymnaea CBP (LymCBP) gene and investigated the roles it plays in synaptic plasticity involved in regulating feeding behaviors. Similar to CBPs of other species, LymCBP possesses functional domains, such as KIX domain, which is essential for interaction with CREB and was shown to regulate long-term memory (LTM). In situ hybridization showed that the staining patterns of LymCBP mRNA in the central nervous system were very similar to those of Lymnaea CREB1 (LymCREB1). A particularly strong LymCBP mRNA signal was observed in the Cerebral Giant Cell (CGC), an identified extrinsic modulatory interneuron of the feeding circuit, key to both appetitive and aversive LTM for taste. Biochemical experiments using the recombinant protein of LymCBP HAT domain showed that its enzymatic activity was blocked by classical HAT inhibitors such as curcumin, anacardic acid and garcinol. Preincubation of Lymnaea CNSs with these HAT inhibitors blocked cAMP-induced long-term potentiation between the CGC and the follower B1 motoneuron. We therefore suggest that HAT activity of LymCBP in the CGCs is a key factor in synaptic plasticity contributing to LTM after classical conditioning.

Year2021
Output mediabioRxiv preprint
Publisherbiorxiv.org
Publication dates
Published22 Jul 2021
ISSN2692-8205
Digital Object Identifier (DOI)https://doi.org/10.1101/2021.05.26.445902
JournalbioRxiv

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