Proteomic profiling identifies key coactivators utilized by mutant ERα proteins as potential new therapeutic targets

Leah A. Gates, Guowei Gu, Yue Chen, Aarti D. Rohira, Jonathan T. Lei, Ross A. Hamilton, Yang Yu, David M. Lonard, Jin Wang, Shu Ping Wang, David G. Edwards, Philip F. Lavere, Jiangyong Shao, Ping Yi, Antrix Jain, Sung Yun Jung, Anna Malovannaya, Shunqiang Li, Jieya Shao, Robert G. RoederMatthew J. Ellis, Jun Qin, Suzanne A.W. Fuqua, Bert W. O’Malley, Charles E. Foulds

Research output: Contribution to journalArticlepeer-review

42 Scopus citations


Approximately 75% of breast cancers are estrogen receptor alpha (ERα)-positive and are treatable with endocrine therapies, but often patients develop lethal resistant disease. Frequent mutations (10–40%) in the ligand-binding domain (LBD) codons in the gene encoding ERα (ESR1) have been identified, resulting in ligand-independent, constitutively active receptors. In addition, ESR1 chromosomal translocations can occur, resulting in fusion proteins that lack the LBD and are entirely unresponsive to all endocrine treatments. Thus, identifying coactivators that bind to these mutant ERα proteins may offer new therapeutic targets for endocrine-resistant cancer. To define coactivator candidate targets, a proteomics approach was performed profiling proteins recruited to the two most common ERα LBD mutants, Y537S and D538G, and an ESR1-YAP1 fusion protein. These mutants displayed enhanced coactivator interactions as compared to unliganded wild-type ERα. Inhibition of these coactivators decreased the ability of ESR1 mutants to activate transcription and promote breast cancer growth in vitro and in vivo. Thus, we have identified specific coactivators that may be useful as targets for endocrine-resistant breast cancers.

Original languageEnglish
Pages (from-to)4581-4598
Number of pages18
Issue number33
StatePublished - Aug 16 2018


Dive into the research topics of 'Proteomic profiling identifies key coactivators utilized by mutant ERα proteins as potential new therapeutic targets'. Together they form a unique fingerprint.

Cite this