glutamate-gated receptor activity potassium channel activity kainate selective glutamate receptor activity molecular_function Note that this term represents an activity and not a gene product. Consider also annotating to the molecular function terms 'ionotropic glutamate receptor activity ; GO:0004970' and 'cation channel activity ; GO:0005261'. GO:0015277 An ionotropic glutamate receptor activity that exhibits fast gating by glutamate, acts by opening a cation channel permeable to sodium and potassium, and for which kainate is an agonist. ligand-gated sodium channel activity