Cancer/testis antigen PAGE4, a regulator of c-Jun transactivation, is phosphorylated by homeodomain-interacting protein kinase 1, a component of the stress-response pathway.
Mooney SM, Qiu R, Kim JJ, Sacho EJ, Rajagopalan K, Johng D, Shiraishi T, Kulkarni P, Weninger KR. Biochemistry. 2014 Mar 18; 53(10):1670-9. Epub 2014 Mar 5.