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首页> 外文期刊>The biochemical journal >The winged-helix/forkhead protein myocyte nuclear factor β (MNF-β) forms a co-repressor complex with mammalian Sin3B
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The winged-helix/forkhead protein myocyte nuclear factor β (MNF-β) forms a co-repressor complex with mammalian Sin3B

机译:翼螺旋/叉形蛋白质肌细胞核因子β(MNF-β)与哺乳动物SIN3B形成副压制复合物

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pWinged-helix/forkhead proteins regulate developmental events in both invertebrate and vertebrate organisms, but biochemical functions that establish a mechanism of action have been defined for only a few members of this extensive gene family. Here we demonstrate that MNF (myocyte nuclear factor)-β, a winged-helix protein expressed selectively and transiently in myogenic precursor cells of the heart and skeletal muscles, collaborates with proteins of the mammalian Sin3 (mSin3) family to repress transcription. Mutated forms of MNF-β that fail to bind mSin3 are defective in transcriptional repression and in negative growth regulation, an overexpression phenotype revealed in oncogenic transformation assays. These data extend the known repertoire of transcription factors with which mSin3 proteins can function as co-repressors to include members of the winged-helix gene family. Transcriptional repression by MNF-β-mSin3 complexes may contribute to the co-ordination of cellular proliferation and terminal differentiation of myogenic precursor cells./p
机译:>翅膀螺旋/叉状蛋白质调节无脊椎动物和脊椎动物的发育事件,但只为这家广泛的基因家族的少数成员定义了建立行动机制的生化功能。在这里,我们证明了MNF(肌细胞核因子)-β,一种在心脏和骨骼肌的肌原素前体细胞中选择性和瞬时表达的翼螺旋蛋白,与哺乳动物SIN3(MSIN3)家族的蛋白质合作,以抑制转录。未结合MSIN3的MNF-β的突变形式在转录抑制和负生长调节中有缺陷,在致癌转化测定中揭示过表达表型。这些数据延伸了MSIN3蛋白可以用作共压制性的转录因子的已知转录因子的再胃部,以包括翼螺旋基因家族的成员。 MNF-β-MSIN3复合物的转录抑制可能有助于肌菌前体细胞细胞增殖和末端分化的协调。

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