8J2O

Crystal Structure of Human Carbonic Anhydrase II In-complex with Acetohexamide at 2.6 A Resolution

X-RAY DIFFRACTION

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Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	3KS3

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, SITTING DROP	7.4	291	Crystallization solution was comprised of Tris-HCl buffer (50 mM, pH=7.4), and 2.9 M ammonium sulfate in sitting drop vapor diffusion setup. Crystallization drop was comprised of hCA-II, Acetohexamide and reservoir buffer. 25% v/v glycerol was used as cryoprotectant.

Crystal Properties
Matthews coefficient	Solvent content
2.05	39.89

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 42.068	α = 90
b = 41.029	β = 104.19
c = 71.628	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	x-ray	100	PIXEL	Bruker PHOTON II		2023-03-15	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SEALED TUBE	BRUKER D8 QUEST	1.5406

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (Observed)	Rrim I (All)	CC (Half)	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	2.6	19.85	98.22	0.26	0.948	11.8	3.7		7293

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	CC (Half)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
1	2.6	2.72	98.5		0.663	3.3

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	3KS3	2.6	19.85	7087	359	99.52	0.18058	0.17656	0.25858	RANDOM	12.813

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]
-0.01		0.03	-0.51		0.45

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	36.52
r_dihedral_angle_3_deg	18.288
r_dihedral_angle_4_deg	14.156
r_dihedral_angle_1_deg	8.12
r_long_range_B_refined	3.991
r_long_range_B_other	3.483
r_angle_refined_deg	1.523
r_scangle_other	1.492
r_mcangle_it	1.376
r_mcangle_other	1.376
r_angle_other_deg	1.186
r_scbond_it	0.942
r_scbond_other	0.832
r_mcbond_it	0.789
r_mcbond_other	0.786
r_chiral_restr	0.063
r_bond_refined_d	0.008
r_gen_planes_refined	0.006
r_bond_other_d	0.001
r_gen_planes_other	0.001
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_scangle_it
r_rigid_bond_restr
r_sphericity_free
r_sphericity_bonded

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	2049
Nucleic Acid Atoms
Solvent Atoms	85
Heterogen Atoms	28

Software

Software
Software Name	Purpose
REFMAC	refinement
PROTEUM PLUS	data reduction
Aimless	data scaling
MOLREP	phasing