9BPE

Joint X-ray/neutron structure of Thermus thermophilus serine hydroxymethyltransferase (TthSHMT) in internal aldimine state and folinic acid bound

X-RAY DIFFRACTION - NEUTRON DIFFRACTION

Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	8SUJ

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, SITTING DROP	5.5	289	40 mM NaOAc pH 5.5, 1.0 M (NH4)2SO4, and 0.5 M Li2SO4, soaked in 40 mM NaOAc pH 5.5, 15% PEG 4000, and 10 mM folinic acid

Crystal Properties
Matthews coefficient	Solvent content
2.64	53.46

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 58.764	α = 90
b = 83.478	β = 91.52
c = 95.558	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	neutron	293	AREA DETECTOR	ORNL ANGER CAMERA		2023-02-21	L	LAUE
2	1	x-ray	293	PIXEL	DECTRIS EIGER R 4M	Osmic Varimax	2023-01-03	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SPALLATION SOURCE	ORNL Spallation Neutron Source BEAMLINE MANDI	2.0-4.16	ORNL Spallation Neutron Source	MANDI
2	ROTATING ANODE	RIGAKU MICROMAX-007 HF	1.5406

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)	CC (Half)	R Split (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	2.3	14.51	92.5	0.216			0.109	0.911		7.3	4.1		38362
2	2	95.5	99.9	0.124			0.074	0.987		9.4	3.7		62375

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	R Merge I (Observed)	R-Sym I (Observed)	Rrim I (All)	Rpim I (All)	CC (Half)	R Split (All)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
1	2.3	2.37		0.266			0.141	0.437		3.2	3.7
2	2	2.07		0.462			0.279	0.73		2.2	3.6

Refinement

Statistics
Diffraction ID	Structure Solution Method	Resolution (High)	Resolution (Low)	Cut-off Sigma (I)	Cut-off Sigma (F)	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
NEUTRON DIFFRACTION	MOLECULAR REPLACEMENT	2.3	14.51		2.5		38074	1910	92.5			0.212	0.239
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	2	40				55831	2738	89.4			0.162	0.187		20.2

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]

RMS Deviations
Key	Refinement Restraint Deviation
x_torsion_deg	17.2
x_torsion_deg	17.2
x_angle_deg	1
x_angle_deg	1
x_torsion_impr_deg	0.78
x_torsion_impr_deg	0.78
x_bond_d	0.007
x_bond_d	0.007

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	6243
Nucleic Acid Atoms
Solvent Atoms	437
Heterogen Atoms	43

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.