DNA methylation in vertebrate cells marks out functionally specialized regions of the genome and is strongly associated with transcriptional repression. Highly conserved methylated-DNA binding proteins (MBD) have been identified and share high specificity in recognizing methylated DNA. In A. thaliana several members of the MBD family have been characterized, showing similarities to animal MBDs. Only few of them can recognize methylated DNA and their physiological and functional significance is still unclear. To study the role of AtMBD7, the only one bearing three MBD domains, we identified AtPRMT11, an arginine methyltransferase, among the protein partners. Our experiments confirmed that these two proteins interact in vitro and can be isolated together in the same complex. These data reveal for the first time in plants the direct interaction between one member of the MBD family and an arginine methyltransferase. Moreover we found that AtPRMT11 can methylate AtMBD7 thus suggesting that AtMBD7 might act as a bridge between two global epigenetic mechanisms of gene regulation in plants. Data describing these particular interaction will be presented and discussed.

Relationship between methylated DNA and arginine methylation in Arabidopsis thaliana.

DE BASTIANI, Morena;RAINIERI, Massimo;BERNACCHIA, Giovanni
2008

Abstract

DNA methylation in vertebrate cells marks out functionally specialized regions of the genome and is strongly associated with transcriptional repression. Highly conserved methylated-DNA binding proteins (MBD) have been identified and share high specificity in recognizing methylated DNA. In A. thaliana several members of the MBD family have been characterized, showing similarities to animal MBDs. Only few of them can recognize methylated DNA and their physiological and functional significance is still unclear. To study the role of AtMBD7, the only one bearing three MBD domains, we identified AtPRMT11, an arginine methyltransferase, among the protein partners. Our experiments confirmed that these two proteins interact in vitro and can be isolated together in the same complex. These data reveal for the first time in plants the direct interaction between one member of the MBD family and an arginine methyltransferase. Moreover we found that AtPRMT11 can methylate AtMBD7 thus suggesting that AtMBD7 might act as a bridge between two global epigenetic mechanisms of gene regulation in plants. Data describing these particular interaction will be presented and discussed.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11392/532415
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