This invention discloses a
fusion protein for detecting autoantibodies against NMDAR-type
encephalitis and its application, belonging to the field of medical detection technology. The
fusion protein includes an NR1
protein and at least one selected from NR2B-eGFP or NR2B-mRFP fusion proteins, wherein the NR1
protein is an NR1
subunit; the NR2B-eGFP
fusion protein is formed by replacing the S2
amino acid sequence of the NR2B
subunit with eGFP; the NR2B-mRFP fusion
protein is formed by replacing the S2
amino acid sequence of the NR2B
subunit with mRFP. Experiments have shown that the fusion protein of this invention can effectively disrupt the
binding ability of glutamate to the NMDAR
receptor, thereby eliminating glutamate-induced
cytotoxicity, and can retain the overall spatial conformation of the NMDAR
receptor and key
autoantibody recognition epitopes, significantly improving the sensitivity and specificity of NMDAR
autoantibody detection based on live cells.