Atypical receptor-like kinase involved in disease resistance. a sn-glycero-3-phosphodiester + H2O = an alcohol + H(+) + sn-glycerol 3-phosphate ATP + L-seryl-[protein] = ADP + H(+) + O-phospho-L-seryl-[protein] ATP + L-threonyl-[protein] = ADP + H(+) + O-phospho-L-threonyl-[protein] A number of isoforms are produced. Splicing is regulated by SUA and DRT111. Expressed in shoots, rosette and cauline leaves, stems, flowers and siliques. The two glycerophosphodiester phosphodiesterase domains are predicted to be extracellular and the kinase domain cytoplasmic. No visible phenotype under normal growth conditons. Gain-of-function mutant plants snc4-1D show a dwarf phenotype, express constitutively the defense marker genes PR1, PR2, and PDF1.2, and display enhanced resistance to Hyaloperonospora arabidopsidis isolate NOCO2. In the N-terminal section; belongs to the glycerophosphoryl diester phosphodiesterase family. In the C-terminal section; belongs to the protein kinase superfamily. Ser/Thr protein kinase family.