[Surface expression of NMDA receptors composed of NR1 subunit and NR2A subunit mutants with partially deleted C-terminus in HEK293 cells].
To examine the potential function of NMDA receptor NR2A subunit C-terminus in assembling and surface expression of the receptor in HEK293 cells.



Five vectors GFP- NR2ADeltaC1- DeltaC5 were constructed for expressing N-terminally GFP-tagged NR2A with C-terminal deletion at different regions by using conventional techniques of molecular cloning. The deleted region for NR2ADeltaC1-Delta C5 was 897L-1017S, 1024D-1142P, 1149D-1347G, 1354S-1464V, and 897L-1464V. These plasmids were transfected alone or co-transfected with NR1-1a into HEK293 cells. The surface NMDA receptors were immuno-stained using rabbit antibody against GFP and Cy3 conjugated secondary antibody in living cells.



The vectors GFP-NR2ADeltaC1-DeltaC5 were generated and all of them expressed GFP fluorescence in the transfected cells. Surface NMDA receptors were detected by immuno-labeling with anti-GFP in the cells co-transfected by NR1-1a and any one of GFP-NR2ADeltaC1-DeltaC5. However, no surface expression of NR2A proteins was found in the transfected cells with any one of these plasmids alone.



Within the region downstream from the 897L of NR2A subunit, neither a particular domain directly interacted with ER retention domain in NR1-1a C1 cassette, nor that determining ER retention of NR2A subunit itself has been found, indicating that more complicated mechanisms might exist in which the subunit assembling and targeting to plasma membrane of NMDA receptors undergo.
Zheng
Chan-ying
CY
Department of Neurobiology, College of Medicine, Zhejiang University, Hangzhou 310006, China.
Luo
Jian-hong
JH
Fu
Ting
T
Yang
Wei
W
Shen
Hai-qing
HQ
D002460:Cell Line; D017353:Gene Deletion; D049452:Green Fluorescent Proteins; D006801:Humans; D008164:Luminescent Proteins / Q000378:metabolism; D009154:Mutation; D016194:Receptors, N-Methyl-D-Aspartate / Q000032:analysis* / Q000235:genetics
D008164:Luminescent Proteins; C409466:NR1 NMDA receptor; C120997:NR2A NMDA receptor; D016194:Receptors, N-Methyl-D-Aspartate; D049452:Green Fluorescent Proteins