3NZA

Structural Analysis of Pneumocystis carinii and Human DHFR Complexes with NADPH and a Series of Five Potent 5-(omega-Carboxy(alkyloxy)pyrido[2,3-d]pyrimidine Derivatives

X-RAY DIFFRACTION

Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	3CD2	PDB entry 3cd2

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	6	273	33-36% PEG 2K, 46-52 mM MES pH 6.0, 100 mM KCl, VAPOR DIFFUSION, HANGING DROP, temperature 273K

Crystal Properties
Matthews coefficient	Solvent content
1.99	38.26

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 36.959	α = 90
b = 42.679	β = 94.57
c = 60.609	γ = 90

Symmetry
Space Group	P 1 21 1

Diffraction

Diffraction Experiment
ID #	Crystal ID	Scattering Type	Data Collection Temperature	Detector	Detector Type	Details	Collection Date	Monochromator	Protocol
1	1	x-ray	200	CCD	MARMOSAIC 325 mm CCD	mirrors	2006-06-06	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	SSRL BEAMLINE BL11-1	0.975	SSRL	BL11-1

Data Collection

Overall
ID #	Resolution (High)	Resolution (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	1.7	60.5	97.5	0.07	0.064	4.4	2.5	21070	19446	2	2	29.7

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	R Merge I (Observed)	R-Sym I (Observed)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
	1.7	1.76	98		0.376	0.325	14.1	2	1144

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Starting model	Resolution (High)	Resolution (Low)	Cut-off Sigma (I)	Cut-off Sigma (F)	Number Reflections (All)	Number Reflections (Observed)	Number Reflections (R-Free)	Percent Reflections (Observed)	R-Factor (Observed)	R-Work	R-Free	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	THROUGHOUT	PDB entry 3cd2	1.9	27.89	2	2	21070	13884	749	97.35	0.21001	0.20592	0.28178	RANDOM	28.354

Temperature Factor Modeling
Anisotropic B[1][1]	Anisotropic B[1][2]	Anisotropic B[1][3]	Anisotropic B[2][2]	Anisotropic B[2][3]	Anisotropic B[3][3]

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	30.431
r_dihedral_angle_3_deg	18.034
r_dihedral_angle_4_deg	16.016
r_dihedral_angle_1_deg	8.578
r_scangle_it	4.767
r_scbond_it	3.076
r_angle_refined_deg	2.299
r_mcangle_it	2.236
r_mcbond_it	1.323
r_chiral_restr	0.16

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	30.431
r_dihedral_angle_3_deg	18.034
r_dihedral_angle_4_deg	16.016
r_dihedral_angle_1_deg	8.578
r_scangle_it	4.767
r_scbond_it	3.076
r_angle_refined_deg	2.299
r_mcangle_it	2.236
r_mcbond_it	1.323
r_chiral_restr	0.16
r_bond_refined_d	0.022
r_gen_planes_refined	0.01

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	1686
Nucleic Acid Atoms
Solvent Atoms	117
Heterogen Atoms	80

Software

Software
Software Name	Purpose
HKL-2000	data collection
MOLREP	phasing
REFMAC	refinement
HKL-2000	data reduction
SCALA	data scaling

RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM157729.