1GPW

Structural evidence for ammonia tunneling across the (beta/alpha)8 barrel of the imidazole glycerol phosphate synthase bienzyme complex.

X-RAY DIFFRACTION

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Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	1THF

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1		8		PROTEIN SOLUTION: 10 MM TRIS (PH 8.0), 1 MM DTT, 1 MM EDTA, 28.8 MG/ML PROTEIN COMPLEX. PRECIPITATE SOLUTION: 15 %[W/V] PEG-8000, 0.9 M AMMONIUM NITRATE, 0.1 M HEPES/HCL (PH 8.5), 10 MM DTT, 5% [V/V] MPD

Crystal Properties
Matthews coefficient	Solvent content
2.81	56.17

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 74	α = 90
b = 91.9	β = 105.9
c = 131	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	100	CCD	X-RAY RESEARCH	BENT MIRROR		M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	EMBL/DESY, HAMBURG BEAMLINE X11		EMBL/DESY, HAMBURG	X11

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	2.37	30	96.7	0.048	28	2.9		65356			46.2

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	2.37	2.45	78.8		0.168	4.5	2.5

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-Factor (Observed)	R-Work	R-Free	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	THROUGHOUT	1THF	2.4	30	65356	3327	97.8	0.226	0.226	0.29	RANDOM	58.4

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]
22.48		7.36	-9.16		-13.33

RMS Deviations
Key	Refinement Restraint Deviation
c_dihedral_angle_d	23.8
c_scangle_it	13.92
c_scbond_it	13.34
c_mcangle_it	9.73
c_mcbond_it	9.63
c_angle_deg	1.5
c_improper_angle_d	0.82
c_bond_d	0.008
c_bond_d_na
c_bond_d_prot
c_angle_d
c_angle_d_na
c_angle_d_prot
c_angle_deg_na
c_angle_deg_prot
c_dihedral_angle_d_na
c_dihedral_angle_d_prot
c_improper_angle_d_na
c_improper_angle_d_prot

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	10643
Nucleic Acid Atoms
Solvent Atoms	459
Heterogen Atoms	30

Software

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