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Mouse Sin3A interacts with and can functionally substitute for the amino-terminal repression of the Myc antagonist Mxi1.

Abstract：

:Mxi1 is a basic region helix-loop-helix leucine zipper (bHLH/LZ) protein that, in association with Max, antagonizes Myc oncogenic activities. A possible mechanistic basis for Mxi1-mediated repression was provided by the recent demonstration that the repressive potential of Mxi1 correlates with its ability to physically associate with mSin3B, one of two mammalian homologues of the yeast transcriptional repressor SIN3. Here, we sought to characterize more fully the physical properties of the second homologue, mSin3A and to determine whether the recruitment of mSin3A by Mxi1 is indeed required for anti-Myc activity. Transient transfection of mammalian cells showed that the mSin3A protein can associate with the strong repressive isoform of Mxi1 (Mxi1-SR) and that, like other Myc superfamily members, both mSin3A and Mxi1-SR localize to the nucleus. From a developmental standpoint, a comparative analysis of Myc, Mxi1-SR and Sin3A expression during postnatal mouse development and in differentiating mouse erythroleukemia (MEL) cells revealed that dramatic and reciprocal changes in Myc and Mxi1-SR mRNA levels are accompanied by minimal stage-specific changes in mSin3A gene expression. This constant expression profile, coupled with the observation that over-expression of mSin3A does not augment the anti-Myc activity of Mxi1-SR in the rat embryo fibroblast (REF) transformation assay, suggests that mSin3A is not a limiting factor in the regulation of Myc superfamily function. Finally, a mSin3A-Mxi1 fusion protein, in which the amino terminal mSin3-interacting domain of Mxi1-SR was replaced with the full-length mSin3A, exhibited a level of repression activity equivalent to, or greater than, the level of repression obtained with Mxi1-SR. Taken together, these observations directly demonstrate that the amino-terminal repression domain of Mxi1-SR functions solely to recruit mSin3A and possibly other proteins like mSin3A and this association is necessary for the anti-Myc activity of Mxi1-SR.

journal_name

Oncogene

journal_title

Oncogene

authors

Rao G,Alland L,Guida P,Schreiber-Agus N,Chen K,Chin L,Rochelle JM,Seldin MF,Skoultchi AI,DePinho RA

subject

Has Abstract

pub_date

1996-03-07 00:00:00

pages

1165-72

issue

5

eissn

0950-9232

issn

1476-5594

journal_volume

12

pub_type

杂志文章

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