Experiment: 1CAN

CRYSTALLOGRAPHIC STUDIES OF THE BINDING OF PROTONATED AND UNPROTONATED INHIBITORS TO CARBONIC ANHYDRASE USING HYDROGEN SULPHIDE AND NITRATE ANIONS

X-RAY DIFFRACTION

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1			277	THIS IS THE HIGH-ACTIVITY ERYTHROCYTIC FORM OF HUMAN CARBONIC ANHYDRASE, CARBONIC ANHYDRASE II, OR CAII. CRYSTALLIZED IN 50 MM TRIS-HCL 2.4 M AMMONIUM SULFATE PH 8.5 AND 1 MM HGCL2 AT 4 DEG C (TILANDER, B., STRANDBERG, B. AND FRIDBORG, K. (1965). CRYSTAL STRUCTURE ON HUMAN ERYTHROCYTIC CARBONIC ANHYDRASE C. J. MOL. BIOL. 12, 740-760.) THE MERCURY IS SUBSEQUENTLY REMOVED BY MERCAPTOETHANOL. THE CRYSTAL IS SOAKED IN 0.6M KNO3 80 MM CITRATE 3M AMMONIUM SULFATE PH 6.0., temperature 277K

Crystal Properties
Matthews coefficient	Solvent content
2.15	42.89

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 42.7	α = 90
b = 41.7	β = 104.6
c = 73	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

Refinement

Statistics
Diffraction ID	Structure Solution Method	Resolution (High)	Resolution (Low)	Number Reflections (R-Free)	Percent Reflections (Observed)	R-Factor (Observed)	R-Work (Depositor)	R-Work (DCC)	R-Free (Depositor)	Mean Isotropic B
X-RAY DIFFRACTION		1.9				0.141		0.1801

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
t_angle_deg	3.4
t_bond_d	0.021
t_dihedral_angle_d
t_incorr_chiral_ct
t_pseud_angle
t_trig_c_planes
t_gen_planes
t_it
t_nbd

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	2088
Nucleic Acid Atoms
Solvent Atoms	231
Heterogen Atoms	6

Software

Software
Software Name	Purpose
TNT	refinement