Probably inactive kinase (PubMed:28751315). Component of the AP2-containing clathrin coat that regulates clathrin-dependent trafficking at plasma membrane, TGN and endosomal system (PubMed:28751315). Together with SCYL2B, required for cell growth, plant growth and development (PubMed:28751315). Colocalizes with the clathrin heavy chain 1 (CHC1). Expressed in roots, seedlings, leaves, stems, flowers, and, at low levels, in siliques. Mainly expressed in leaf mesophyll cells, and, at low levels, in root vascular tissues. The protein kinase domain is predicted to be catalytically inactive. The double mutant scyl2a scyl2b has short root hairs and small shoots. Belongs to the protein kinase superfamily. Although it belongs to the kinase superfamily, lacks the residues involved in ATP binding, suggesting that it has no protein kinase activity.