7LKL

The internal aldimine form of the wild-type Salmonella typhimurium Tryptophan Synthase in complex with inhibitor N-(4'-trifluoromethoxybenzenesulfonyl)-2-amino-1-ethylphosphate (F9F) at the enzyme alpha-site, cesium ion at the metal coordination site and the product L-tryptophan at the enzyme beta-site at 1.05 Angstrom resolution. One of the beta-Q114 rotamer conformations allows a hydrogen bond to form with the PLP oxygen at the position 3 in the ring

X-RAY DIFFRACTION

Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	5CGQ

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, SITTING DROP	7.8	298	50 mM Bicine-CsOH, 10% PEG 8,000, 2 mM Spermine, pH 7.8

Crystal Properties
Matthews coefficient	Solvent content
2.55	51.88

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 181.741	α = 90
b = 59.81	β = 94.65
c = 67.299	γ = 90

Symmetry
Space Group	C 1 2 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	ADSC QUANTUM 315r		2020-09-25	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	ALS BEAMLINE 12.3.1	0.88558	ALS	12.3.1

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (Observed)	R Merge I (Observed)	R Sym I (Observed)	Rrim I (All)	Rpim I (All)	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	1.05	90.571	93.9	0.115	0.115	0.146	0.076	4.5	3.8		312765

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	R Merge I (Observed)	R-Sym I (Observed)	Rrim I (All)	Rpim I (All)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
1	1.05	1.11	91.5		1.031	1.031	1.263	0.643	0.4	3.9

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	5cgq	1.05	28.92	297211	15524	93.58	0.1556	0.1545	0.1762	RANDOM	12.923

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]
-1.1		-0.75	2.05		-0.81

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	33.189
r_dihedral_angle_4_deg	16.967
r_dihedral_angle_3_deg	11.869
r_dihedral_angle_1_deg	6.275
r_angle_other_deg	1.523
r_angle_refined_deg	1.486
r_rigid_bond_restr	1.255
r_chiral_restr	0.08
r_bond_refined_d	0.008
r_gen_planes_refined	0.007

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	33.189
r_dihedral_angle_4_deg	16.967
r_dihedral_angle_3_deg	11.869
r_dihedral_angle_1_deg	6.275
r_angle_other_deg	1.523
r_angle_refined_deg	1.486
r_rigid_bond_restr	1.255
r_chiral_restr	0.08
r_bond_refined_d	0.008
r_gen_planes_refined	0.007
r_gen_planes_other	0.002
r_bond_other_d	0.001

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	4968
Nucleic Acid Atoms
Solvent Atoms	869
Heterogen Atoms	188

Software

Software
Software Name	Purpose
xia2	data reduction
SCALA	data scaling
MOLREP	phasing
DM	phasing
REFMAC	refinement
PDB_EXTRACT	data extraction

RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM157729.