Table 1.

Data collection and refinement statistics

l-GlutamateKainate
Ligand
    Space groupP21P2
    Unit cell parameters (Å, °)a = 47.2, b = 105.1,
c = 66.3, β = 97.2
a = 45.7, b = 48.4,
c = 62.8, β = 106.6
    Matthews coefficient (Å3/Da)2.862.34
    Solvent content (%)57.047.2
    Resolutiona19.69–1.90 (1.99–1.90)19.95–2.20 (2.25–2.20)
    Total reflectionsa167,093 (22,257)48,592 (2974)
    Unique reflectionsa45,551 (6257)13,431 (847)
    Rsyma,b (%)8.4 (13.0)12.5 (22.7)
    Completenessa (%)90.2 (96.1)99.3 (98.6)
    IIa12.4 (8.7)10.09 (5.86)
Refinement statistics
    No. of protein atoms (non-H)40262013
    No. of waters270175
    Rworka (%)21.0 (22.4)20.4 (23.3)
    Rfreea (%)22.5 (23.4)27.9 (31.2)
    Ramachandran plotc (%)93.6/6.4/0/092.9/7.1/0/0
    RMSD (bonds/angles) (Å, °)0.009/1.1000.011/1.302
    Protein Bavd2) (chain A/B)10.58 (10.58/10.58)12.83 (NA)
    Ligand Bavd2) (chain A/B)7.87 (8.58/7.16)9.39 (NA)
    Water Bavd2)12.6315.44
  • NA, Not applicable; RMSD, root mean square deviation from targets.

  • aValues in parentheses indicate statistics for the highest resolution shell of data.

  • bRsym = ΣhjhIhj|/ΣhjIhj.

  • cCore/allowed/generously allowed/disallowed.

  • dResidual B factors calculated by REFMAC (does not include the contribution to atomic displacements from translation, libration, and screw rotation displacement).