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The mixed lineage leukemia fusion partner AF9 binds specific isoforms of the BCL-6 corepressor.

Abstract：

:The mixed lineage leukemia (MLL) gene at chromosome band 11q23 is commonly involved in reciprocal translocations that are detected in acute leukemias. Evidence suggests that the resulting MLL fusion genes contribute to leukemogenesis. AF9 is a common MLL fusion partner in acute myeloid leukemia. The AF9 protein functions as a transcriptional activator in artificial reporter gene assays and a structurally related protein in yeast, ANC1/TFG3, is a component of the SWI/SNF complex. Apart from these observations, little is known about the biologic function of AF9 in mammals. We have found that a recently described transcriptional repressor, BCL-6 corepressor (BCoR), interacts with the carboxy-terminus of AF9. The interaction of AF9 with BCoR has been confirmed by independent in vitro and in vivo protein-binding studies. The BCoR gene is expressed as several alternatively spliced transcripts. AF9 only binds BCoR isoforms that contain a unique 34 aa sequence located in the mid-portion of the protein. In artificial reporter gene assays, a BCoR isoform that binds AF9 efficiently suppresses AF9 transcriptional activity, while a nonbinding isoform does not. These results indicate that different isoforms of BCoR have unique biologic properties and that cell function may be partly determined by the different isoforms that are present within the cell.

journal_name

Oncogene

journal_title

Oncogene

authors

Srinivasan RS,de Erkenez AC,Hemenway CS

doi

10.1038/sj.onc.1206361

subject

Has Abstract

pub_date

2003-05-29 00:00:00

pages

3395-406

issue

22

eissn

0950-9232

issn

1476-5594

pii

1206361

journal_volume

22

pub_type

杂志文章

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