Words similar to transactivating
Example sentences for: transactivating
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USF1 and USF2 display identical dimerization and DNA binding domains, but the transactivating regions differ [ 25 ] . USF1 and USF2 obviously serve different, yet overlapping functions, and regulating the relative USF1/USF2 levels may be decisive for the pattern of USF-mediated gene expression, which has been shown in studies of USF knockout mice.
An NMR structure for the lexA DNA-binding domain has been presented [ 26 ] . The structure is compact and globular, and probably interferes only minimally with fused transactivating sequences.
, the DNA-binding elements and the transactivating portion of the molecule (or complex) do not require precise positioning with respect to each other).
Stat3 also contains in its N-terminus one of this motifs ( 221LAGLL 225) [ 39 ] . Moreover, Stat3 also presents a Ser at -2 position of the LXXLL sequence, which in the case of the coactivator TRBP defines selectivity for nuclear receptors [ 40 ] . Phosphorylation of Stat3 has been reported to occur only in 705Tyr and in 727Ser, allowing dimerization and full transactivating activity [ 41 ] . Whether this 219Ser next to the LXXLL motif is involved in the coactivator activity of Stat3, and the interaction of Stat3 with other coactivators only takes place in the context of Stat3 transcription factor activity or also can be part of the general mechanism of the transcription complex formation requires further studies.
The main USF isoforms USF1 (43 kDa) and USF2 (44 kDa) are ubiquitously expressed and encoded by separate genes [ 9 10 11 ] . In addition, more isoforms of USF2 are produced due to alternative splicing and utilization of different translation start sites [ 12 13 ] . USF factors exist as homo and heterodimers, and the heterodimer of USF1/USF2a seems to dominate, although there are cell-type specific variations [ 12 ] . USF1 and USF2 show different transactivating potential, and USF2 appears to be the functional transactivator of the GIRE complex, although both USF1 and USF2 are important for sustained dietary-induced expression of the fatty acid synthase gene in liver [ 14 ] .
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