The assemblage of specific ion channels and receptors at synaptic sites is crucial for signaling between pre- and post-synaptic cells. DLG (Drosophila discs-large gene) is co-localized with Shaker K1 channels, which are clustered at glutamatergic synapses. DLG-Shaker interactions are required in vivo for shaker clustering at the neuromuscular junction. The channel protein Shaker which is properly synthesized, glycosylated, folded, assembled and delivered to the plasma membrane is very important for the potassium channel function.