Steroid receptor co-activator-3 (SRC-3) is a co-activator that plays important roles in normal physiology and different diseases including cancer. Its activity is regulated by phosphorylation. Serine 857 (S857) is the most frequently reported phosphorylation site of SRC-3. In this work, we examined several kinases that could phosphorylate SRC-3 at S857 and explored the functional outcome incurred ...