The protein encoded by this gene belongs to the Ser/Thr family of protein kinases and HIPK subfamily. It phosphorylates homeodomain transcription factors and may also function as a co-repressor for homeodomain transcription factors. Alternative splicing results in four transcript variants encoding four distinct isoforms.[1]
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Li X, Zhang R, Luo D, Park SJ, Wang Q, Kim Y, Min W (Apr 2005). "Tumor necrosis factor alpha-induced desumoylation and cytoplasmic translocation of homeodomain-interacting protein kinase 1 are critical for apoptosis signal-regulating kinase 1-JNK/p38 activation". The Journal of Biological Chemistry. 280 (15): 15061–70. doi:10.1074/jbc.M414262200. PMID15701637.