Linked Life Data

17053042

Source:http://linkedlifedata.com/resource/pubmed/id/17053042

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pubmed-article:17053042pubmed:abstractTextTranscription of the rat P450c17 gene in Leydig cells requires steroidogenic factor-1 (SF-1) (NR5A1), nerve growth factor-inducible protein B (nurr77), COUP-TF, and SET. The -447/-419 region of this promoter contains two binding sites for orphan nuclear receptors that are required for activation by SF-1, nerve growth factor-inducible protein B, and cAMP. We identified a novel factor, steroidogenic factor-inducer of transcription-2, that binds to this -447/-419 region. We have now purified steroidogenic factor-inducer of transcription-2 from mouse Leydig MA-10 cells and identified it by mass spectrometry as translin, a 27-kDa protein that exerts many functions. By itself, translin cannot activate a P450c17-promoter/reporter construct in HeLa cells; however, translin increased SF-1-stimulated transcription 2-fold, indicating cooperativity between SF-1 and translin. Mutation of both SF-1 binding sites in the -447/-419 sequence eliminated activation by SF-1 and translin. Translin did not augment SF-1-stimulated transcription from all SF-1-responsive elements, suggesting that the activation is specific for the sequence of the SF-1 response element. Gel shift analysis of double- and single-stranded DNA showed that translin binds to single-stranded DNA, but its transcriptional activation is independent of DNA binding. The hinge region of SF-1 is necessary for activation by translin; deletion of hinge amino acids 170-225 in SF-1 eliminates translin's ability to augment SF-1-dependent transcription. A translin-like protein, called translin-associated factor X, can substitute for a translin moiety; translin homomers and translin/translin-associated factor X heteromers activated SF-1-stimulated transcription equally. Thus, we have identified a new factor that works together with SF-1 to augment gene transcription in a DNA-specific fashion.lld:pubmed
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pubmed-article:17053042pubmed:year2007lld:pubmed
pubmed-article:17053042pubmed:articleTitleTranslin coactivates steroidogenic factor-1-stimulated transcription.lld:pubmed
pubmed-article:17053042pubmed:affiliationDepartment of Obstetrics, Gynecology, and Reproductive Sciences, University of California, San Francisco, San Francisco, California 94143-0556, USA. mellon@cgl.ucsf.edulld:pubmed
pubmed-article:17053042pubmed:publicationTypeJournal Articlelld:pubmed
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