A simple technique for the prediction of interacting proteins reveals a direct Brn-3a-androgen receptor interaction

Berwick, Daniel C.; Diss, James K. J.; Budhram-Mahadeo, Vishwanie S. and Latchman, David S. (2010). A simple technique for the prediction of interacting proteins reveals a direct Brn-3a-androgen receptor interaction. The Journal of Biological Chemistry, 285(20) pp. 15286–15295.

DOI: https://doi.org/10.1074/jbc.M109.071456

Abstract

The formation of multiprotein complexes constitutes a key step in determining the function of any translated gene product. Thus, the elucidation of interacting partners for a protein of interest is of fundamental importance to cell biology. Here we describe a simple methodology for the prediction of novel interactors. We have applied this to the developmental transcription factor Brn-3a to predict and verify a novel interaction between Brn-3a and the androgen receptor (AR). We demonstrate that these transcription factors form complexes within the nucleus of ND7 neuroblastoma cells, while in vitro pull-down assays show direct association. As a functional consequence of the Brn-3a-AR interaction, the factors bind cooperatively to multiple elements within the promoter of the voltage-gated sodium channel, Nav1.7, leading to a synergistic increase in its expression. Thus, these data define AR as a direct Brn-3a interactor and verify a simple interacting protein prediction methodology that is likely to be useful for many other proteins.