1H9M

Two crystal structures of the cytoplasmic molybdate-binding protein ModG suggest a novel cooperative binding mechanism and provide insights into ligand-binding specificity. PEG-grown form with molybdate bound

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION	7.5		VAPOUR DIFFUSION. 20% PEG 4000, 5% ISOPROPANOL IN 100MM HEPES PH7.5 WITH 2MM NA2MOO4., pH 7.50

Crystal Properties
Matthews coefficient	Solvent content
1.34	41

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 81.96	α = 90
b = 81.96	β = 90
c = 93.417	γ = 120

Symmetry
Space Group	H 3

Diffraction

Diffraction Experiment
ID #	Crystal ID	Scattering Type	Data Collection Temperature	Detector	Detector Type	Details	Collection Date	Monochromator	Protocol
1	1	x-ray	100	CCD	MARRESEARCH		1999-06-15	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	ESRF BEAMLINE ID14-2		ESRF	ID14-2

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	1.65	41	100	0.044	41.7	12.4		28231		-3	19.9

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	R Merge I (Observed)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
1	1.65	1.68	100		0.107	8.8

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Starting model	Resolution (High)	Resolution (Low)	Number Reflections (Observed)	Number Reflections (R-Free)	Percent Reflections (Observed)	R-Work	R-Free	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	THROUGHOUT	1H9J	1.65	40	28231	1385	98.7	0.191	0.226	RANDOM	27

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_transverse_tor	51.7
p_staggered_tor	14.3
p_scangle_it	6.918
p_scbond_it	4.995
p_mcbond_it	4.43
p_planar_tor	4.4
p_mcangle_it	3.967
p_multtor_nbd	0.265
p_singtor_nbd	0.18
p_chiral_restr	0.162
p_xyhbond_nbd	0.131
p_planar_d	0.043
p_angle_d	0.038
p_bond_d	0.026
p_plane_restr	0.0233
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	1954
Nucleic Acid Atoms
Solvent Atoms	79
Heterogen Atoms	32

Software

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