4CD2

LIGAND INDUCED CONFORMATIONAL CHANGES IN THE CRYSTAL STRUCTURES OF PNEUMOCYSTIS CARINII DIHYDROFOLATE REDUCTASE COMPLEXES WITH FOLATE AND NADP+

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1		6		pH 6.0

Crystal Properties
Matthews coefficient	Solvent content
1.97	48

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 38.048	α = 90
b = 61.51	β = 90
c = 85.665	γ = 90

Symmetry
Space Group	P 21 21 21

Diffraction

Diffraction Experiment
ID #	Crystal ID	Scattering Type	Data Collection Temperature	Detector	Detector Type	Details	Collection Date	Monochromator	Protocol
1	1	x-ray	293				1997-08-09	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	ROTATING ANODE	RIGAKU RU200

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (Observed)	R Merge 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	2	99	97.7	0.052	12.7	2.6		13866		2

Refinement

Statistics
Diffraction ID	Structure Solution Method	Resolution (High)	Resolution (Low)	Cut-off Sigma (F)	Number Reflections (Observed)	Number Reflections (R-Free)	Percent Reflections (Observed)	R-Work	R-Free	Mean Isotropic B
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	2	8	2	11837		98.3	0.176		23.16

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
p_staggered_tor	20.6
p_transverse_tor	19.7
p_scangle_it	3.289
p_mcangle_it	2.991
p_planar_tor	2.3
p_scbond_it	2.141
p_mcbond_it	1.878
p_multtor_nbd	0.252
p_xyhbond_nbd	0.205
p_singtor_nbd	0.201
p_chiral_restr	0.174
p_planar_d	0.05
p_angle_d	0.049
p_bond_d	0.017
p_plane_restr	0.014
p_angle_deg
p_hb_or_metal_coord
p_xhyhbond_nbd
p_orthonormal_tor
p_special_tor

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	1652
Nucleic Acid Atoms
Solvent Atoms	55
Heterogen Atoms	32

Software

Software
Software Name	Purpose
AMoRE	phasing
PROLSQ	refinement
DENZO	data reduction
SCALEPACK	data scaling