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Activation of cAMP response element-mediated gene expression by regulated nuclear transport of TORC proteins.

Bittinger, Mark and McWhinnie, Elizabeth and Meltzer, Jodi and Iourgenko, Vadim and Latario, Brian and Liu, Xiulin and Chen, Chein Hwa and Song, Chuanzheng and Garza, Dan and Labow, Mark (2004) Activation of cAMP response element-mediated gene expression by regulated nuclear transport of TORC proteins. Current Biology : CB, 14 (23). pp. 2156-2161. ISSN 0960-9822

Abstract

The CREB family of proteins are critical mediators of gene expression in response to extracellular signals and are essential regulators of adaptive behavior and long-term memory formation. The TORC proteins were recently described as potent CREB coactivators, but their role in regulation of CREB activity remained unknown. TORC proteins were found to be exported from the nucleus in a CRM1-dependent fashion. A high-throughput microscopy-based screen was developed to identify genes and pathways capable of inducing nuclear TORC accumulation. Expression of the catalytic subunit of PKA and the calcium channel TRPV6 relocalized TORC1 to the nucleus. Nuclear accumulation of the three human TORC proteins was induced by increasing intracellular cAMP or calcium levels. TORC1 and TORC2 translocation in response to calcium, but not cAMP, was mediated by calcineurin, and TORC1 was shown to be directly dephosphorylated by calcineurin. TORC function was shown to be essential for CRE-mediated gene expression induced by cAMP, calcium, or GPCR activation, and nuclear transport of TORC1 was sufficient to activate CRE-dependent transcription. Drosophila TORC was also shown to translocate in response to calcineurin activation in vivo. Thus, TORC nuclear translocation is an essential, conserved step in activation of cAMP-responsive genes.

Item Type: Article
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Additional Information: author can archive post-print (ie final draft post-refereeing); Publisher's version/PDF cannot be used
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Date Deposited: 14 Dec 2009 13:55
Last Modified: 31 Jan 2013 01:09
URI: https://oak.novartis.com/id/eprint/704

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