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Publication : A steroid receptor coactivator, SRA, functions as an RNA and is present in an SRC-1 complex.

First Author  Lanz RB Year  1999
Journal  Cell Volume  97
Issue  1 Pages  17-27
PubMed ID  10199399 Mgi Jnum  J:54002
Mgi Id  MGI:1333984 Doi  10.1016/s0092-8674(00)80711-4
Citation  Lanz RB, et al. (1999) A steroid receptor coactivator, SRA, functions as an RNA and is present in an SRC-1 complex. Cell 97(1):17-27
abstractText  Nuclear receptors play critical roles in the regulation of eukaryotic gene expression. We report the isolation and functional characterization of a novel transcriptional coactivator, termed steroid receptor RNA activator (SRA). SRA is selective for steroid hormone receptors and mediates transactivation via their amino-terminal activation function. We provide functional and mechanistic evidence that SRA acts as an RNA transcript; transfected SRA, unlike other steroid receptor coregulators, functions in the presence of cycloheximide, and SRA mutants containing multiple translational stop signals retain their ability to activate steroid receptor-dependent gene expression. Biochemical fractionation shows that SRA exists in distinct ribonucleoprotein complexes, one of which contains the nuclear receptor coactivator steroid receptor coactivator 1. We suggest that SRA may act to confer functional specificity upon multiprotein complexes recruited by liganded receptors during transcriptional activation.
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