ISDA

X-RAY DIFFRACTION

Crystallization Details

Method	pH	Temprature	Details
X-RAY DIFFRACTION	8.75	277	HUMAN DHFR/FOLATE COMPLEX WAS MIXED WITH NADPH AND 6-((2,5-DIETHOXYPHENYL)AMINOMETHYL)-2, 4-DIAMINO-5-METHYLPYRIDO(2,3-D)PYRIMIDINE (SRI-8686) (BOTH 2 MM FINAL). CRYSTALS WERE GROWN BY HANGING DROP VAPOR DIFFUSION AT 277 K BY MIXING EQUAL VOLUMES OF PROTEIN/NADPH/SRI-8686 WITH RESERVOIR (24% PEG 4000, 200 MM LI2SO4, 100 MM TRIS.HCL, PH 8.75). TRUNCATED TRIANGULAR CRYSTALS APPEARED SLOWLY, IN ABOUT A MONTH. THE CRYSTAL WAS CRYOPROTECTED WITH 15% GLYCEROL AND FLASH-COOLED IN LIQUID N2.

Unit Cell:

a: 87.725 Å b: 94.387 Å c: 95.439 Å α: 90.00° β: 90.00° γ: 90.00°

Symmetry:

Space Group: C 2 2 21

Crystal Properties:

Matthew's Coefficient: 2.3 Solvent Content: 46.61

Refinement Statistics

Diffraction ID	Structure Solution Method	Cross Validation Method	Resolution Limit (High)	Resolution Limit (Low)	Number of Reflections (Observed)	Number of Reflections (R-free)	Percent Reflections (Observed)	R-Work	R-Free	Mean Isotropic
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	THROUGHOUT	1.27	14.95	98560	5251	99.8	0.172	0.203	16.01

Data Collection

Overall

Resolution Limit (High)	Resolution Limit (Low)	Percent Possible (Observed)	R Merge I (Observed)	R Sym I (Observed)	Net I Over Average Sigma (I)	Redundancy	Number Reflections (All)	Number Reflections (Observed)	Observed Criterion Sigma (F)	Observed Criterion Sigma (I)	B (Isotropic) From Wilson Plot
1.25	15.00	98.9	0.05	?	10.10	3.4	?	109188	?	-10.0	16.10

Highest Resolution Shell

#	Resolution Limits (Low)	Resolution Limits (High)	Percent Possible (All)	Percent Possible (Observed)	R-Sym I (Observed)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
1	1.25	1.28	88.0		?	1.40	2.8

Diffraction

Diffraction experiment

Crystal ID	Scattering Type	Data Collection Temprature	Detector	Detector Type	Details	Collection Date	Monochromator	Protocol
1		100 K

Radiation Source

Source	Type	Wavelength List	Synchrotron Site	Beamline
SYNCHROTRON	SSRL BEAMLINE BL9-1	?	SSRL	BL9-1

Software