The CAMP responsive factor CREB stimulates gene expression, following its phosphorylation at Ser133, via recruitment of the coactivator CBP. In certain cell types, CREB also functions as a constitutive activator, although the underlying mechanisms are not understood. Here, we characterize a conserved family of coactivators, designated TORCs, for Transducers of Regulated CREB activity, that enhances CRE-dependent transcription via a phosphorylation-independent interaction with the bZIP DNA binding/dimerization domain of CREB. TORC recruitment does not appear to modulate CREB DNA binding activity, but rather enhances the interaction of CREB with the TAF(II)130 component of TFIID following its recruitment to the promoter. Remarkably, in certain mucoepidermoid carcinomas, a chromosomal translocation fuses the CREB binding domain of TORC1 to the Notch coactivator Mastermind (MAML2). As expression of the TORCi-MAML2 chimera strongly induced target gene expression via CREB, our results reveal a mechanism by which CREB stimulates transcription in normal and transformed cells.

TORCs: Transducers of regulated CREB activity / M. D., Conkright; Canettieri, Gianluca; R., Screaton; E., Guzman; L., Miraglia; J. B., Hogenesch; M., Montminy. - In: MOLECULAR CELL. - ISSN 1097-2765. - STAMPA. - 12:2(2003), pp. 413-423. [10.1016/j.molcel.2003.08.013]

TORCs: Transducers of regulated CREB activity

CANETTIERI, Gianluca;
2003

Abstract

The CAMP responsive factor CREB stimulates gene expression, following its phosphorylation at Ser133, via recruitment of the coactivator CBP. In certain cell types, CREB also functions as a constitutive activator, although the underlying mechanisms are not understood. Here, we characterize a conserved family of coactivators, designated TORCs, for Transducers of Regulated CREB activity, that enhances CRE-dependent transcription via a phosphorylation-independent interaction with the bZIP DNA binding/dimerization domain of CREB. TORC recruitment does not appear to modulate CREB DNA binding activity, but rather enhances the interaction of CREB with the TAF(II)130 component of TFIID following its recruitment to the promoter. Remarkably, in certain mucoepidermoid carcinomas, a chromosomal translocation fuses the CREB binding domain of TORC1 to the Notch coactivator Mastermind (MAML2). As expression of the TORCi-MAML2 chimera strongly induced target gene expression via CREB, our results reveal a mechanism by which CREB stimulates transcription in normal and transformed cells.
2003
01 Pubblicazione su rivista::01a Articolo in rivista
TORCs: Transducers of regulated CREB activity / M. D., Conkright; Canettieri, Gianluca; R., Screaton; E., Guzman; L., Miraglia; J. B., Hogenesch; M., Montminy. - In: MOLECULAR CELL. - ISSN 1097-2765. - STAMPA. - 12:2(2003), pp. 413-423. [10.1016/j.molcel.2003.08.013]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/145051
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