Table 3.

Cryo-EM data collection, refinement, and validation statistics

IMPDH1(595)-S477D compressed free octamerIMPDH1(546)-S477D compressed filament octamerIMPDH1(546)-S477D compressed filament interfaceIMPDH1(546)-S477D extended filament octamerIMPDH1(546)-S477D extended filament interface
Ligands GTP, ATP, IMP, NAD+ GTP, ATP, IMP, NAD+ GTP, ATP, IMP, NAD+ ATP, IMP, NAD+ ATP, IMP, NAD+ 
PDB ID 8U7M 8U7Q 8U7V 8U8O 8U8Y 
EMDB ID EMD-41986 EMD-41989 EMD-42012 EMD-42026 EMD-42029 
Data collection and refinement 
Magnification 36,000 36,000 36,000 105,000 105,000 
Voltage (kV) 200 200 200 300 300 
Electron exposure (e265 50 50 50 50 
Defocus range (µm) −1.8 to −1.2 −1.8 to −1.2 −1.8 to −1.2 −1.8 to −1.2 −1.8 to −1.2 
Pixel size (data collection) (Å) 1.16 1.16 1.16 0.4215 0.4215 
Pixel size (reconstruction) (Å) 1.16 1.16 1.16 0.843 0.843 
Micrographs (no.) 646 756 756 4,632 4,632 
Initial particles (no.) 343,619 434,369 434,369 5,836,476 5,836,476 
Final particles (no.) 163,814 163,916 149,184 1,773,701 1,951,413 
Symmetry imposed D4 D4 D4 D4 D4 
Resolution (CryoSPARC) postprocess
(0.143 FSC) (Å) 
3.1 3.3 3.3 2.4 2.1 
Resolution (3DFSC)
(0.5 FSCref) (Å) 
3.2 3.4 3.5 2.4 2.3 
Model refinement and validation 
Initial model (PDB ID) 7RGD 7RGQ 7RGI 7RGM 7RGL 
Root-mean-square deviations      
Bond lengths (Å) 0.017 0.017 0.017 0.014 0.011 
Bond angles (°) 1.378 1.334 1.412 1.302 0.989 
MolProbity score 1.79 1.60 1.66 1.44 1.30 
Clash score 10.32 6.75 7.94 3.62 2.24 
C-β deviations 0% 0% 0% 0% 0% 
Rotamer outliers (%) 0.27% 0.73% 0.85% 1.24% 1.76% 
Ramachandran plot      
Favored (%) 96.23% 96.51% 96.52% 96.64% 97.44% 
Allowed (%) 3.77% 3.28% 3.27% 3.36% 2.56% 
Disallowed (%) 0% 0.21% 0.22% 0% 0% 
Cross-correlation (mask) 0.69 0.83 0.83 0.75 0.86 
Map resolution estimates      
FSC 0.5 (masked) 3.63 3.45 3.50 2.54 2.13 
FSC 0.5 (unmasked) 3.64 3.56 3.72 2.63 2.26 
IMPDH1(595)-S477D compressed free octamerIMPDH1(546)-S477D compressed filament octamerIMPDH1(546)-S477D compressed filament interfaceIMPDH1(546)-S477D extended filament octamerIMPDH1(546)-S477D extended filament interface
Ligands GTP, ATP, IMP, NAD+ GTP, ATP, IMP, NAD+ GTP, ATP, IMP, NAD+ ATP, IMP, NAD+ ATP, IMP, NAD+ 
PDB ID 8U7M 8U7Q 8U7V 8U8O 8U8Y 
EMDB ID EMD-41986 EMD-41989 EMD-42012 EMD-42026 EMD-42029 
Data collection and refinement 
Magnification 36,000 36,000 36,000 105,000 105,000 
Voltage (kV) 200 200 200 300 300 
Electron exposure (e265 50 50 50 50 
Defocus range (µm) −1.8 to −1.2 −1.8 to −1.2 −1.8 to −1.2 −1.8 to −1.2 −1.8 to −1.2 
Pixel size (data collection) (Å) 1.16 1.16 1.16 0.4215 0.4215 
Pixel size (reconstruction) (Å) 1.16 1.16 1.16 0.843 0.843 
Micrographs (no.) 646 756 756 4,632 4,632 
Initial particles (no.) 343,619 434,369 434,369 5,836,476 5,836,476 
Final particles (no.) 163,814 163,916 149,184 1,773,701 1,951,413 
Symmetry imposed D4 D4 D4 D4 D4 
Resolution (CryoSPARC) postprocess
(0.143 FSC) (Å) 
3.1 3.3 3.3 2.4 2.1 
Resolution (3DFSC)
(0.5 FSCref) (Å) 
3.2 3.4 3.5 2.4 2.3 
Model refinement and validation 
Initial model (PDB ID) 7RGD 7RGQ 7RGI 7RGM 7RGL 
Root-mean-square deviations      
Bond lengths (Å) 0.017 0.017 0.017 0.014 0.011 
Bond angles (°) 1.378 1.334 1.412 1.302 0.989 
MolProbity score 1.79 1.60 1.66 1.44 1.30 
Clash score 10.32 6.75 7.94 3.62 2.24 
C-β deviations 0% 0% 0% 0% 0% 
Rotamer outliers (%) 0.27% 0.73% 0.85% 1.24% 1.76% 
Ramachandran plot      
Favored (%) 96.23% 96.51% 96.52% 96.64% 97.44% 
Allowed (%) 3.77% 3.28% 3.27% 3.36% 2.56% 
Disallowed (%) 0% 0.21% 0.22% 0% 0% 
Cross-correlation (mask) 0.69 0.83 0.83 0.75 0.86 
Map resolution estimates      
FSC 0.5 (masked) 3.63 3.45 3.50 2.54 2.13 
FSC 0.5 (unmasked) 3.64 3.56 3.72 2.63 2.26 

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