2QA3

Structural Studies Reveal the Inactivation of E. coli L-aspartate aminotransferase by (S)-4,5-amino-dihydro-2-thiophenecarboxylic acid (SADTA) via two mechanisms (at pH6.5)

X-RAY DIFFRACTION

Starting Model(s)

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

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	EVAPORATION	6.5	298	The well solutions contained 25 mM potassium phosphate and 43% saturated ammonium sulfate with 20 mM of SADTA at pH 6.5, EVAPORATION, temperature 298K

Crystal Properties
Matthews coefficient	Solvent content
2.94	58.15

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 153.897	α = 90
b = 84.9	β = 90
c = 78.877	γ = 90

Symmetry
Space Group	C 2 2 21

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 315		2005-02-20	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	APS BEAMLINE 14-BM-C	0.9	APS	14-BM-C

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	1.75	27	99.6	0.065	10.8	7		51173

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	1.75	1.81	100		0.566	3.3	6.9	5050

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Starting model	Resolution (High)	Resolution (Low)	Cut-off Sigma (I)	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	1AMQ	1.75	76.92	3.3	49413	2656	99.58	0.1565	0.15438	0.19706	RANDOM	22.107

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]
-1.13			0.45		0.68

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	32.826
r_dihedral_angle_4_deg	20.883
r_dihedral_angle_3_deg	14.248
r_dihedral_angle_1_deg	5.616
r_scangle_it	3.701
r_scbond_it	2.61
r_mcangle_it	1.584
r_angle_refined_deg	1.425
r_mcbond_it	1.011
r_nbtor_refined	0.307

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	32.826
r_dihedral_angle_4_deg	20.883
r_dihedral_angle_3_deg	14.248
r_dihedral_angle_1_deg	5.616
r_scangle_it	3.701
r_scbond_it	2.61
r_mcangle_it	1.584
r_angle_refined_deg	1.425
r_mcbond_it	1.011
r_nbtor_refined	0.307
r_nbd_refined	0.23
r_symmetry_vdw_refined	0.197
r_symmetry_hbond_refined	0.179
r_xyhbond_nbd_refined	0.15
r_chiral_restr	0.088
r_bond_refined_d	0.011
r_gen_planes_refined	0.005

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	2994
Nucleic Acid Atoms
Solvent Atoms	407
Heterogen Atoms	133

Software

Software
Software Name	Purpose
REFMAC	refinement
ADSC	data collection
HKL-2000	data reduction
HKL-2000	data scaling
PHASER	phasing

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.