Experiment: 3TMJ

Joint X-ray/neutron structure of human carbonic anhydrase II at pH 7.8

NEUTRON DIFFRACTION - X-RAY DIFFRACTION

Starting Model(s)

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

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, SITTING DROP	7.8	293	1.3 M sodium citrate, 100 mM Tris, pH 7.8, VAPOR DIFFUSION, SITTING DROP, temperature 293K

Crystal Properties
Matthews coefficient	Solvent content
2.17	43.26

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 42.83	α = 90
b = 41.7	β = 104.58
c = 72.92	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	PCS neutron detector		2010-08-01	L	LAUE
2	1	x-ray	293	IMAGE PLATE	RIGAKU RAXIS IV++		2010-06-18	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	NUCLEAR REACTOR	OTHER	0.60-7.0
2	ROTATING ANODE	RIGAKU FR-E+ DW	1.5418

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	20	84.2									14520	14236
2	1.65	35	92.3	0.035						23.1	2.94	81941	81941

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	1.65	1.71		0.147	0.147					4	1.67

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 (Depositor)	R-Work (DCC)	R-Free (Depositor)	R-Free (DCC)	R-Free Selection Details	Mean Isotropic B
NEUTRON DIFFRACTION	MOLECULAR REPLACEMENT	2	20	2		14520	13820	700				0.2797		0.2938

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
c_bond_d	0.983
c_angle_deg	0.005

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	2058
Nucleic Acid Atoms
Solvent Atoms	191
Heterogen Atoms	1

Software

Software
Software Name	Purpose
PCS	data collection
nCNS	refinement
d*TREK	data reduction
SCALA	data scaling
d*TREK	data scaling
nCNS	phasing