Table 2.

LRET lifetimes and measurements

Ligated State (nDonor-only lifetime Donor-acceptor lifetime Distance 
 µs µs Å 
GluN2B Cleft – GluN1* + GluN2Bcleft (Ni(NTA)2Cy3) (51.0 Å)    
Apo (3) 1,847 ± 1 252 ± 12 48.8 ± 0.4 
Ifenprodil (4) 1,826 ± 1 203 ± 12 46.0 ± 0.5 
GluN1 Cleft – GluN1cleft + GluN2B* (Alexa Fluor 555) (47.2 Å)    
Apo (2) 1,740 ± 1 275 ± 4 49.2 ± 0.1 
Ifenprodil (2) 1,747 ± 1 263 ± 2 48.7 ± 0.1 
GluN1–GluN2B Upper Lobes – GluN1*C22 + GluN2B*H30 (Ni(NTA)2Cy3) (64.0 Å)    
Apo (5) 1,738 ± 1 362 ± 26 52.1 ± 0.6 
Ifenprodil (2) 1,807 ± 1 374 ± 26 52.0 ± 0.6 
GluN1 Upper Lobe–GluN2B Lower Lobe – GluN1*C22 + GluN2B*232 (Alexa Fluor 555) (35.2 Å)    
Apo (3) 1,674 ± 16 228 ± 9 47.8 ± 0.3 
Ifenprodil (3) 1,694 ± 4 194 ± 8 46.2 ± 0.3 
GluN1 Upper Lobe–GluN2A Lower Lobe – GluN1*C22 + GluN2A*C231 (Alexa Fluor 555)    
Apo (3) 1,692 ± 1 187 ± 6 45.9 ± 0.2 
Zinc (2) 1,683 ± 1 156 ± 9 44.4 ± 0.4 
Ligated State (nDonor-only lifetime Donor-acceptor lifetime Distance 
 µs µs Å 
GluN2B Cleft – GluN1* + GluN2Bcleft (Ni(NTA)2Cy3) (51.0 Å)    
Apo (3) 1,847 ± 1 252 ± 12 48.8 ± 0.4 
Ifenprodil (4) 1,826 ± 1 203 ± 12 46.0 ± 0.5 
GluN1 Cleft – GluN1cleft + GluN2B* (Alexa Fluor 555) (47.2 Å)    
Apo (2) 1,740 ± 1 275 ± 4 49.2 ± 0.1 
Ifenprodil (2) 1,747 ± 1 263 ± 2 48.7 ± 0.1 
GluN1–GluN2B Upper Lobes – GluN1*C22 + GluN2B*H30 (Ni(NTA)2Cy3) (64.0 Å)    
Apo (5) 1,738 ± 1 362 ± 26 52.1 ± 0.6 
Ifenprodil (2) 1,807 ± 1 374 ± 26 52.0 ± 0.6 
GluN1 Upper Lobe–GluN2B Lower Lobe – GluN1*C22 + GluN2B*232 (Alexa Fluor 555) (35.2 Å)    
Apo (3) 1,674 ± 16 228 ± 9 47.8 ± 0.3 
Ifenprodil (3) 1,694 ± 4 194 ± 8 46.2 ± 0.3 
GluN1 Upper Lobe–GluN2A Lower Lobe – GluN1*C22 + GluN2A*C231 (Alexa Fluor 555)    
Apo (3) 1,692 ± 1 187 ± 6 45.9 ± 0.2 
Zinc (2) 1,683 ± 1 156 ± 9 44.4 ± 0.4 

Shown are the lifetimes and distances from measurements in GluN1/GluN2B receptors in the apo, ifenprodil-bound, and zinc-bound states. The distance next to the construct name is measured between the alpha carbons of the residues labeled from the ifenprodil-bound structure of the NMDA receptor (Protein Data Bank accession no. 4PE5).

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