Dual function of MIPS1 as a metabolic enzyme and transcriptional regulator

作者：Latrasse David; Jegu Teddy; Meng Pin Hong; Mazubert Christelle; Hudik Elodie; Delarue Marianne; Charon Celine; Crespi Martin; Hirt Heribert; Raynaud Cecile; Bergounioux Catherine; Benhamed Moussa^*

来源：Nucleic Acids Research, 2013, 41(5): 2907-2917.

DOI：10.1093/nar/gks1458

Because regulation of its activity is instrumental either to support cell proliferation and growth or to promote cell death, the universal myo-inositol phosphate synthase (MIPS), responsible for myo-inositol biosynthesis, is a critical enzyme of primary metabolism. Surprisingly, we found this enzyme to be imported in the nucleus and to interact with the histone methyltransferases ATXR5 and ATXR6, raising the question of whether MIPS1 has a function in transcriptional regulation. Here, we demonstrate that MIPS1 binds directly to its promoter to stimulate its own expression by locally inhibiting the spreading of ATXR5/6-dependent heterochromatin marks coming from a transposable element. Furthermore, on activation of pathogen response, MIPS1 expression is reduced epigenetically, providing evidence for a complex regulatory mechanism acting at the transcriptional level. Thus, in plants, MIPS1 appears to have evolved as a protein that connects cellular metabolism, pathogen response and chromatin remodeling.

• 出版日期2013-3
• 单位贵州省农业科学院