1XQF

The mechanism of ammonia transport based on the crystal structure of AmtB of E. coli.

X-RAY DIFFRACTION

---

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, SITTING DROP	4.6	298	PEG 550, pH 4.6, VAPOR DIFFUSION, SITTING DROP, temperature 298K

Crystal Properties
Matthews coefficient	Solvent content
3.9	68.1

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 111.8	α = 90
b = 111.8	β = 90
c = 86.4	γ = 120

Symmetry
Space Group	P 63

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		2004-07-31	M	SAD

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	SLS BEAMLINE X06SA	0.9797	SLS	X06SA

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (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	1.8	96.67	95.6	0.054	13.2	3.8		54526		-3	37

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	R-Sym I (Observed)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
1	1.8	1.85	98.5		0.71	2	3.7	4386

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Resolution (High)	Resolution (Low)	Number Reflections (All)	Number Reflections (Observed)	Number Reflections (R-Free)	Percent Reflections (Observed)	R-Factor (All)	R-Factor (Observed)	R-Work	R-Free	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	THROUGHOUT	1.8	25	51701	51701	2751	95.77	0.18196	0.18196	0.18062	0.20755	RANDOM	38.799

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]
1.27	0.63		1.27		-1.9

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	29.411
r_dihedral_angle_3_deg	11.672
r_dihedral_angle_4_deg	11.201
r_scangle_it	6.584
r_scbond_it	4.972
r_dihedral_angle_1_deg	4.693
r_mcangle_it	3.442
r_mcbond_it	2.612
r_angle_refined_deg	1.121
r_nbtor_refined	0.292
r_nbd_refined	0.175
r_symmetry_vdw_refined	0.125
r_chiral_restr	0.076
r_xyhbond_nbd_refined	0.073
r_symmetry_hbond_refined	0.055
r_bond_refined_d	0.013
r_gen_planes_refined	0.003

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	2632
Nucleic Acid Atoms
Solvent Atoms	103
Heterogen Atoms	14

Software

Software
Software Name	Purpose
REFMAC	refinement
MAR345	data collection
XDS	data scaling
SHARP	phasing