Probable cyclic nucleotide-gated ion channel (PubMed:11500563). Forms a functional cation-translocating unit with AHAs that is activated by PSKR1/BAK1 and possibly other BAK1/RLK complexes (PubMed:26071421). Required for PSK-induced protoplast expansion (PubMed:26071421). Homotetramer or heterotetramer (Probable). Part of a functional complex containing PSKR1, BAK1, CNGC17, and AHA (PubMed:26071421). Interacts with AHA1, AHA2, and BAK1, but not with PSKR1 or BRI1 (PubMed:26071421). The binding of calmodulin to the C-terminus might interfere with cyclic nucleotide binding and thus channel activation. Belongs to the cyclic nucleotide-gated cation channel (TC 1.A.1.5) family.