2YCT

Tyrosine phenol-lyase from Citrobacter freundii in complex with pyridine N-oxide and the quinonoid intermediate formed with L-alanine

X-RAY DIFFRACTION

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Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	2EZ2	PDB ENTRY 2EZ2

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	8	293	CRYSTALS OF THE C. FREUNDII TPL WERE GROWN AT 277 AND 293 K USING THE HANGING DROP VAPOR DIFFUSION METHOD. THE BEST CRYSTALS WERE OBTAINED BY MIXING 2 UL OF THE PROTEIN SOLUTION (18-20 MG/ML) CONTAINING 50MM K-PHOSPHATE PH 8.0, 0.5 MM PLP, 1MM DDT WITH AN EQUAL VOLUME OF THE RESERVOIR SOLUTION CONTAINING 50 MM TRIETHANOLAMINE BUFFER (PH 8.0), 0.5 MM PLP, 2 MM DDT, 0.4 M KCL, AND 35-38% (W/V) POLY(ETHYLENE GLYCOL) 5000 MONOMETHYL ETHER. THE ALANINE QUINONOID COMPLEX WITH PYRIDINE N-OXIDE (9PO) WAS PREPARED BY SOAKING WILD TYPE TPL CRYSTALS IN THE STABILIZATION SOLUTION CONTAINING 40% (W/V) POLY(ETHYLENE GLYCOL) 5000 MONOMETHYL ETHER (PEG 5000 MME), 50 MM TRIETHANOLAMINE PH 8.0, 0.25 M KCL, 0.2 MM PYRIDOXAL 5-PHOSPHATE (PLP), 0.5 MM DITHIOTHREITOL (DTT), WITH ADDITION OF 100 MM L- ALANINE AND A SATURATING CONCENTRATION OF PYRIDINE N-OXIDE. SINCE THE CRYSTALS QUALITY DETERIORATED RAPIDLY, THE SOAKING TIME WAS RESTRICTED TO ABOUT 20 S.

Crystal Properties
Matthews coefficient	Solvent content
2.8	56.5

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 133.993	α = 90
b = 143.77	β = 90
c = 60.081	γ = 90

Symmetry
Space Group	P 21 21 2

Diffraction

Diffraction Experiment
ID #	Crystal ID	Scattering Type	Data Collection Temperature	Detector	Detector Type	Details	Collection Date	Monochromator	Protocol
1	1	x-ray	100	IMAGE PLATE	MARRESEARCH		1999-09-21	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	2.25	20	99	0.05	13.8	3.4		55230		-3

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	2.25	2.29	94		0.17	4.5	2.8

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-Factor (Observed)	R-Work	R-Free	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	THROUGHOUT	PDB ENTRY 2EZ2	2.25	20	54235	995	98.68	0.14003	0.13926	0.1811	RANDOM	28.85

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]
-0.44			-0.53		0.97

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	32.773
r_dihedral_angle_3_deg	14.479
r_dihedral_angle_4_deg	13.947
r_dihedral_angle_1_deg	6.087
r_scangle_it	5.656
r_scbond_it	4.133
r_mcangle_it	2.104
r_angle_refined_deg	1.335
r_mcbond_it	1.25
r_chiral_restr	0.093
r_bond_refined_d	0.014
r_gen_planes_refined	0.006
r_bond_other_d
r_angle_other_deg
r_gen_planes_other
r_nbd_refined
r_nbd_other
r_nbtor_refined
r_nbtor_other
r_xyhbond_nbd_refined
r_xyhbond_nbd_other
r_metal_ion_refined
r_metal_ion_other
r_symmetry_vdw_refined
r_symmetry_vdw_other
r_symmetry_hbond_refined
r_symmetry_hbond_other
r_symmetry_metal_ion_refined
r_symmetry_metal_ion_other
r_mcbond_other
r_mcangle_other
r_scbond_other
r_scangle_other
r_long_range_B_refined
r_long_range_B_other
r_rigid_bond_restr
r_sphericity_free
r_sphericity_bonded

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	7208
Nucleic Acid Atoms
Solvent Atoms	791
Heterogen Atoms	101

Software

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