Protein kinase that recognizes phosphorylation sites in which the surrounding peptides have an alpha-helical conformation (PubMed:10021370). Regulates cardiac development and cardiomyocyte differentiation by negatively regulating Wnt/beta-catenin signaling (By similarity). ATP + L-seryl-[protein] = ADP + H(+) + O-phospho-L-seryl-[protein] ATP + L-threonyl-[protein] = ADP + H(+) + O-phospho-L-threonyl-[protein] Belongs to the protein kinase superfamily. Alpha-type protein kinase family. ALPK subfamily.