Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

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Watanabe, M. et al.

A subfamily of RNA-binding DEAD-box proteins acts as an estrogen receptor alpha coactivator through the N-terminal activation domain (AF-1) with an RNA coactivator, SRA.

One class of the nuclear receptor AF-2 coactivator complexes contains the SRC-1/TIF2 family, CBP/p300 and an RNA coactivator, SRA. We identified a subfamily of RNA-binding DEAD-box proteins (p72/p68) as a human estrogen receptor alpha (hER alpha) coactivator in the complex containing these factors. p72/p68 interacted with both the AD2 of any SRC-1/TIF2 family protein and the hER alpha A/B domain, but not with any other nuclear receptor tested. p72/p68, TIF2 ( SRC-1) and SRA were co-immunoprecipitated with estrogen- bound hER alpha in MCF7 cells and in partially purified complexes associated with hER alpha from HeLa nuclear extracts. Estrogen induced co-localization of p72 with hER alpha and TIF2 in the nucleus. The presence of p72/p68 potentiated the estrogen- induced expression of the endogenous pS2 gene in MCF7 cells. In a transient expression assay, a combination of p72/p68 with SRA and one TIF2 brought an ultimate synergism to the estrogen- induced transactivation of hER alpha. These findings indicate that p72/p68 acts as an ER subtype-selective coactivator through ER alpha AF-1 by associating with the coactivator complex to bind its AF-2 through direct binding with SRA and the SRC-1/TIF2 family proteins.[1]

References

A subfamily of RNA-binding DEAD-box proteins acts as an estrogen receptor alpha coactivator through the N-terminal activation domain (AF-1) with an RNA coactivator, SRA. Watanabe, M., Yanagisawa, J., Kitagawa, H., Takeyama , K., Ogawa, S., Arao, Y., Suzawa, M., Kobayashi, Y., Yano, T., Yoshikawa, H., Masuhiro, Y., Kato, S. EMBO J. (2001) [Pubmed]

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