mouse monoclonal IgG1; rapsyn Antibody (1234) is an IgG1 mouse monoclonal rapsyn antibody (also designated rapsyn antibody) that detects the rapsyn protein of mouse, rat and human origin by WB and IF. rapsyn Antibody (1234) is available as the non-conjugated anti-rapsyn antibody. The RAPSN gene locus is located on chromosome 11p11.1-p11.2 and encodes a peripheral membrane protein. Rapsyn (receptor-associated protein of the synapse) is expressed in the postsynaptic membrane of skeletal muscle. Rap-syn is required for the clustering of nicotinic acetylcholine receptors (nAChR). Rapsyn self-associates through at least two of its seven tetra-tricopeptide repeats (TPRs). Rapsyn interacts with the large intracellular domain of the nAChR a subunit through the hydrophobic surface of the coiled-coil domain. Rapsyn modifies trafficking of AChR within the cell. Expression is essential for agrin-induced AChR clustering. Overexpression inhibits agrin-induced AChR clustering pathway. Absence of rapsyn causes deficit in the formation of postsynaptic specializations at neuromuscular synapse, which increases axonal branching and motonueron survival. Rapsyn plays a role in selective targeting of newly synthesized intracellular AChR to postsynaptic membrane.