Regulates chemoreceptor expression by phosphorylating the hda-4 class II histone deacetylase (HDAC) and inhibiting the gene repression functions of hda-4 and the mef-2 transcription factor, enabling the correct sensing and transduction of food signals. Role in determining body size, the dauer decision and serotonin-mediated egg laying. May modulate the Sma/Mab pathway and regulates development in the later larval stages (By similarity). ATP + L-seryl-[protein] = ADP + H(+) + O-phospho-L-seryl-[protein] ATP + L-threonyl-[protein] = ADP + H(+) + O-phospho-L-threonyl-[protein] Interacts with tax-6. Nuclear in larval stage. Predominantly cytoplasmic in the adult but translocates into the nucleus following heat shock (By similarity). Autophosphorylated. Elevated cAMP levels appears to act via PKA to directly or indirectly phosphorylate multiple sites on kin-29 and inhibit function (By similarity). Belongs to the protein kinase superfamily. CAMK Ser/Thr protein kinase family. SNF1 subfamily.